China - Zhejiang Urban Environment Project : environmental assessment (Vol. 5 of 9)

E740 v.5 March 2003 WB LOAN Environment Impact Assessment Report for N i ngbo J i angdongnanqu WWTP & Sewerage Project (for approval) RESEARCH & DESIGN ACADEMY OF ENVIRONMENTAL PROTECTION OF NINGBO National EA Certification: First Grade No.2004 March, 2003 i r j 1   Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project Table of Division of responsibility for Environment Impact Assessment of Ningbo Jiangdongnanqu WWTP & Sewerage Project Ningbo Jiangdongnanqu WWTP & Sewerage Project Name Project Project Document Environment Impact Assessment Report Classification Public utility engineering of the project Commission Ningbo Urban Infrastructure Development unit. Office Commissioned Research & Design Academy of Environment unit Protection of Ningbo Assessment No.2004,First Grade, National Certification Environment Assessment Dean, Legal Jin Jianqiang person Principal of implement agency Liu Zhong Proj ect Prijci Pan Peifeng (Post No,A20040027) principal Technical Liu Zhong (Post No.A20040004) auditing Zhao Yongcai (Post No.A20040018)  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project Main Participants and Their Titles Name Specialty Title Post No. Bi Yulong Environmental Senior engineer A20040006 chemistry Shang Weichun Environmental Engineer A20040022 Engineering Environmental Luo Deyu Engineeng Engineer A20040016 Engineering Bao Wihong Environmental Egne 2000 Bao Wihong Engineering Egne 2000 Pan Peifeng Ecological Engineer A20040027 . ~Entironment Wu Wenjun Environmental Engineer A20040011 software 2  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project Contents 1 FOREWORD ......................................................7 1.1 BACKGROUND ..................7 1.2 OBJECTIVES OF THE EIA ..................8 1.3 BASIS FOR THE EIA ................9 1.4 SCOPE OF THE EIA ................9 1.5 ASSESSMENT STANDARDS .. 10 1.5.1 Environmental Quality Standard ................................................... 10 1.5.2 Pollutants Emission Standards .....................................................1 ] 1.6 ENVIRONMENTAL PROTECTION OBJECTIVES . ........................................ 12 1.7 STAGES OF EIA ..................................................... 12 1.8 MAIN TECHNOLOGY AND METHODS ADOPTED IN EIA ............................ 13 1.9 BRIEF INTRODUCTION TO THE INSTITUTION CONDUCTING THE EIA ... 13 2 PROJECT DESCRIPTION ..................................................... 15 2.1 BASIC CHARACTERS OF THE PROJECT ................................. 15 2.2 COMPONENTS OF THE PROJECT ..................................................... 16 2.2.1 Discharge Networks anid Pumping Stations ................................... 16 2.2.2 WWTP Engineering ..................................................... 26 2.3 SEWAGE TREATMENT PROCESS ....................................... 42 2.4 SEWAGE VOLUME AND CONSTRUCTION CAPACITY . . 47 2.4.1 Current Sewage Discharge ..................................................... 47 2.4.2 Forecast on Designed Sewage Volume .......................................... 48 2.4.3 Designed scale of the treatment plantError! Bookmark not defined. 2.5 SEWAGE DISPOSAL GRADE ..................................................... 51 2.5.1 Sewage quality ..................................................... 51 2.5.2 Design Sewage Quality ............................... ...................... 68 2.5.3 Degree of Treatment ........................................... 68 2.6 PROJECT MANAGEMENT AND IMPLEMENTATION PLAN . . 68 2.6.1 Principle and Procedures for Implementation ............... ................ 69 2.6.2 Project Construction Management Institution ............................... 69 3  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project 2.6.3 Project Operation Management .................................................... 70 2.6.4 Schedule of Project implementation .............................................. 71 2.7 PROJECT CONSTRUCTION MANAGEMENT . ............................................. 74 2.7.1 Construction Period ................... ................................. 74 2.7.2 Construction machines .................................................... 74 2.7.3 Main Earthworks ................ .................................... 74 2.8 POLLUTION SOURCES ANALYSIS OF THE PROJECT . . 74 2.8.1 Pollution Source Analysis in the Operation Stage ............ ............. 74 2.8.2 The analysis of the pollution sources during the operation period 77 3 SURVEY OF THE ENVIRONMENT ................................................... 78 3.1 NATURAL ENVIRONMENT .......................................... 78 3.1.1 Geographical Position ........................ ............................ 79 3.1.2 Topography and Physiognomy .................................................... 79 3.1.3 Meteorology .................................................... 81 3.1.4 Ground water .................................................... 81 3.1.5 River System .................................................... 82 3.2 SURVEY OF ENVIRONMENT ......................................... 84 3.3 SOCIAL ENVIRONMENT ............................................ 85 3.3.1 Introductiont to the city ........................ ............................ 85 3.3.2 Territorial division and population ............................................... 86 3.3.3 Industry .................................................... 86 3.3.4 Agriculture .................................................... 87 3.3.5 Infi-astructure .................................................... 87 3.3.6 Public utilities .................................................... 89 3.4 LIVING STANDARD .................................................... 90 3.5 CURRENT ENVIRONMENTAL STATUS .................................. 91 3.5.1 Water environment status ...................................... .............. 91 3.5.2 Ambient Air .................................................... 141 3.5.3 Acoustic Environment .................................................... 144 3.6 ECOLOGICAL ENVIRONMENT ...................................... 145 3.7 CURRENT STATUS SURVEY ON INDUSTRIAL POLLUTION SOURCES AROUND .................................................... 146 4 ANTICIPATIVE ENVIRONMENT IMPACTS AND PREVENTION AND ABATEMENT MEASURES .152 4.1 ENVIRONMENTAL IMPACTS PROJECTION AND PREVENTION AND ABATEMENT MEASURES FOR SURFACE WATER ................................................ 152 4.1.1 The Environment impact of surface water in the construction stage .............................................................................. 152 4.1.2 The projection of the environmental impact on surface water in operation stage and measures for prevention and abatement 153 4.2 IMPACT ON AMBIENT AIR PROJECTION AND PREVENTION AND ABATEMENT 4  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project MEASURES.~~~~~~~~~~~~~~~~~~1 77 M EA SU RES ............................................................................... 177 4.2.1 . Impact on ambient air and prevention and abatement measures in the construction stage ...................................................... 177 4.2.2 Ambient Air Environmental Impact and Measures for Prevention and Abatement in the Stage of Operation ................................................ 178 4.3 ACOUSTIC ENVIRONMENTAL IMPACT PROJECTION AND MEASURES FOR PREVENTION AND ABATEMENT ...................................................... 184 4.3.1 Acoustic environmental impact and mitigation measures ............ 184 4.3.2 The impacts on acoustic environment and mitigation measures .. 186 4.4 SOLID WASTES ENVIRONMENTAL IMPACT ANALYSIS AND MITIGATION MEASURES ...................................................... 189 4.4.1 . Solid wastes environment in the construction stage and mitigationi measures ...................................................... 189 4.4.2 . Solid wastes impact in the operation stage and mitigation measures ...................................................... 190 4.5 IMPACTS ON SOCIAL ENVIRONMENT ANALYSIS AND MITIGATION MEASURES ...................................................... 192 4.5.1 Social environment impacts in the construction stage and mitigation measures ...................................................... 192 4.5.2 Social Environmental impact in the operation stage ................... 199 4.6 ECOLOGICAL ENVIRONMENTAL IMPACT ANALYSIS AND MITIGATION MEASURES ...................................................... 200 4.6.1 Ecological environmental impact in the construction stage and m itigation m easures ...................................................... 200 4.6.2 . Ecological environmental analysis in the operation stage and mitigation measures ............................................... 200 4.7 ANALYSIS OF ACCIDENTAL RISK .................................... 201 4.7.1 Pumping unusable ...................................................... 202 4.7.2 The Accidental discharge of the effluent of the WWTP ................ 202 4.7.3 . Dehydrated sludge Centralized Landfill .................................... 203 4.7.4 adding chlorine risk ...................................................... 195 5 ALTERNATIVE SCHEMIES .. ........ .. 204 5.1 SITE OF THE WWTP SELECTION ...................................................... 204 5.2 SEWAGE TREATMENT PROCESS SCHEMES ........................................... 206 5.2.1 Brief description of the schemes .................................................. 206 5.2.2 . Alternative Scheme ...................................................... 206 6 PUBLIC PARTICIPATION ...................................................... 209 6.1 OBJECTIVE AND METHOD ...................................................... 210 6.1]. ssurvey objectiv ...................................................... 201 6.1.2 survey priciple ...................................................... 202 6.1.3survey methord ...................................................... 203 5  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project 6.1.4 survey organization ............................. 204 6.2 THE FIRST PUBLIC PATICIPATION .. .......................... 211 6.2.1 survey content ............................. 211 6.2.2 Survey result ............................. 211 6.3 THE SECOND PUBLIC PATICIPATION .......... .. ................ 211 6.3.1 Survey content ............................. 211 6.3.2 Survey Results ............................. 212 6.3 FINAL SURVEY RESULTS .......................................... 211 7 ENVIRONMENTAL ECONOMIC BENEFIT AND LOSS ANALYSIS ....................................................................................... ...........................217 7.1 ECONOMIC BENEFIT . 218 7.2 ENVIRONMENTAL BENEFIT ...................................................... 219 7.2.1 Cost Estimation of Main Environmental Protection Measures .... 219 7.2.2 . Environmental benefit and loss analysis .................................... 219 7.3 SOCIALBENEFIT ...................................................... . 220 8 ENVIRONMENTAL MANAGEMENT AND ENVIRONMENTAL MONITORING PLAN ........................................................ 222 8.1 ENVIRONMENTAL MONITORING PLAN ................................................. 222 8.1.1 Environmental Monitoring Plan for Surface Water ......... ............ 223 8.1.2 Sludge Monitoring Plan .......................................................... 223 8.1.3 Sewage water quality monitoring plan .................. ...................... 223 8.2 ENVIRONMENTAL MANAGEMENT ........................................................ 224 S. 2. 1 Institution and personnel .......................................................... 224 8.2.2 The responsibility of the Division ................................................ 224 8.2.3 . Implementation of environmental management and monitoring plan ....................................................... 225 8.2.4 Setup Insulation Belt ........................... ........................... 225 8.2.5 Setup navigation marks and anchor ban marks above bottom pipeline and outfall ...................................................... 225 9 CONCLUSION AND SUGGESTION .227 9.1 CURRENT ENVIRONMENTAL STATUS CONCLUSION . .227 9.1.1 Ambient Air .227 9.1.2 Surface Water Environment .227 9.1.3 Acoustics Environment .227 9.1.4 Ecological Environment .228 9.2 POLLUTION SOURCES OUTPUT . .228 9.2.1 Effluent Discharge of WP. .228 9.2.2 Solid waste of WWTP .228 9.3 ENVIRONMENTAL IMPACT CONCLUSION . .228 9.3.1 Ambient Air .229 9.3.2 Water Environment .229 6  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project 9.3.3 Acoustic Environment ..................................................... 230 9.3.4 The solid waste ..................................................... 230 9.3.5 Social Environment ..................................................... 231 9.4 CONCLUSION FOR POLLUTION PREVENTION AND ABATEMENT AND MITIGATION MEASURES ..................................................... 231 9.4.1 Prevention and abatement measures for surface water pollution. 231 9.4.2 Prevention and abatement for ambient air pollution ................... 232 9.4.3 Prevention and abatement measures for acoustic environment .... 232 9.4.4 Solid waste impact and prevention and abatement measure ........ 233 9.4.5 Prevention and abatement measures for social environmental im pact ..................................................... 233 9.4.6 Ecological environmental pollution and prevention abatement measure ...................................................... 233 9.5 ENVIRONMENTAL MANAGEMENT AND MONITORING PLAN ................. 234 9.5.1 Environmental monitoring plan ................................................... 234 9.5.2 Environment Management ..................................................... 234 9.6 FINAL CONCLUSION ..................................................... 234 10 REFERENCE 11 APPEND FILES 1 Foreword 1.1 Background Ningbo is one of the earliest coastal cities opening to the outside world approved by the State Council. With economic growth and development of the urban construction, the urban area has been expanded and population has been increased continually .The issue of water quality deterioration of water bodies of inland rivers and Yong River has become more and more serious due to discharges of industrial and domeatic sewage , and such condition has endangered the surface water quality and marine water quality in shore. The existing Jiangdongbeiqu WWTP only has a capacity of 100000m3/d, which is far from meeting the demand of the city development. According to the Urban Master Planning, up to 2005, the total volume of sewage in the central city will be 840000 tons, of which Sanjiangpian Area has the sewage volume of 520000 t/d, and the sewage treatment ratio will be 40%. Therefore, it is obvious very important to build new WWTPs and reconstruction of the sewage network 7  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project in the urban areas. For the purpose, the city government decided to build Ningbo Jiangdongnanqu WWTP and Sewerage Project with loan of 26.127 million USD from the World Bank The total investment of the project is 402.11 million RMB; except for the World Bank loan, the rest part will be raised by the city government The sewage treatment capacity will reach to 160000m3/d after the project finished .The project will play a positive role for increasing sewage treatment ratio, reducing pollutant load, improving the surface water environment quality and investment environment of the city . According to the "Environment Protection Law of PRC" and "Environmental Management Rules for Construction Project", No. 253 Order issued by the State Council in November 1998.and Check-list of Construction Project for Environment Classification Management (First batch), the project is required to prepare EIA. Based on "Notice on Strengthening Environmental Impact Assessment Work in Construction Projects Financed by International Financial Organizations" No. (1993) 324 issued by SEPA, and World Bank Operational Directives: (OP4.01) Our academy was entrusted by Ningbo Urban Infrastructure Development Office to prepare the report of "Preliminary Feasibility Study Report on Environment Impact of Ningbo Jiangdongnanqu WWTP and Sewerage Project " and "Preliminary Assessment of the Environment Impact for Ningbo Jiangdongnanqu WWTP and Sewerage Project " .The potential environment impacts have been assessed on the above reports .The assements mainly focused on the issues of the impact of discharges on water body functions, impact of foul smell of the WWTP .sludge disposal and improvement of urban environment. Based on this, we have prepared the report of the Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP and Sewerage Project for appraisal and examination by the World Bank Mission and domestic superior Environmental Protection Departments. 1.2 Objectives of the EIA The purpose of the assessment: (1) Clarify the current status of the environment quality in the project construction area through survey and monitoring in the range of the assessment area; (2) Obtain the information on sewage of the city and incoming sewage quality of the WWTP through monitoring to the sewage quality of the city; (3) Determine the source intensity of discharged pollutants of the WWTP through engineering analysis and then on the basis of this to analyze and project the impacts of them on the ambient environment after the 8  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project project start up so as to put forward prevention and abatement measures ;(4) A feasibility study to be conducted from the environmental point of view on the issues of project site selection ,sewage treatment capacity ,site of outfall and discharge types through above work so as to provide basis for the project decision-making ,engineering design and environment management. 1.3 Basis for the EIA 1, "Environmental Management Rules for Construction Project", No. 253 Order issued by the State Council in November 1998; 2. " Technical Guideline for EIA" (HJ/T2.1-2.3- 1993) 3, Technical Guideline for EIA" HJIT2.1-2.3-93, T2.4-95.HJ/T2.4-1995 4, Technical Guideline for EIA" HJ/T19-1997; 5. "Master Plan for Urban Development of Ningbo" 6, "Environmental Function Zoning of Surface Waters in Ningbo Municipality " By Ningbo Municipal Environment Protection Bureau ,Nov.,1992 7. "Implementation opinions on Environmental Management Rules for Construction Project", No. 165 [1999] issued by Zhejiang Provincial Environment Protection Bureau in May, 1999 8. " Issues on Environmental Management for Construction Projects" No.117 [88] issued by SEPA 9. "Notice on Strengthening Environmental Impact Assessment Work in Construction Projects Financed by International Financial Organizations" No. (1993) 324 issued by SEPA, State Planning Commission, Chinese Ministry of Finance and People's Bank of China. 10. "World Bank Operational Directives:" (OP4.01) 11. "Preliminary Feasibility Study Repot for Ningbo Jiangdongnanqu WWTP and Sewerage" by ENFI 2002.20 12. "Entrust Letter of EIA Work for Ningbo Jiangdongnanqu WWTP and Sewerage project "issued by Ningbo Urban Infrastructure Development Office on 29/12/1999 1.4 Scope of the EIA 9  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project The scope of surface water assessment ranges from Panshidu of Fenghua River to Zhenhai estuary of Yong River with a total length of 45 km; scope of air assessment is within the range of 500 m from the plant boundary; Noise assessment is with 200m from the plant boundary and 50m from the sewage pumping stations .The scope of social survey includes the sewerage and service area, mainly in Haisu district and south of Jiangdong district The key area is I km surrounding of the WWTP. 1.5 Assessment Standards Based on the regional environmental protection objectives, environment function zoning and characters of engineering, the following assessment standards are adopted: 1.5.1 Environmental Quality Standard (1) Ambient Air Quality Standard According to air function zoning, Class II standard prescribed in " "Ambient Air Quality Standard" GB3095-1996 is adopted in project area. "The Maximum Permissible Concentrations for Pollutants in Ambient Air in the Residential District" is adopted for H 2S and N3H. (See table 1-1 for details) Table 1-1 Ambient Air Quality Standard (mg/m3) Class II Pollutants Per hour Daily Annual Basis averag average average erag SO2 0.50 0.15 0.06 Class II, NO2 0.24 0.12 0.08 B0519 TSP - 0.30 0.20 GB3095-1996 H2S 0.01 TJ36-79 Air standard in N3H 0.2 - - residential area (2) Surface Water Quality Standard Class III of " Surface Water Environmental Quality Standard " GB3838-2002 is adopted for inland rivers and Fenghua River (Fanshidu-Tongpenpu section); Class IV of 10  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project "Surface Water Environmental Quality Standard " GB3838-2002 is adopted for Fenghua River (Tongpenpu-Sanjiangkou section ) and Yong River. See Table 1-2 for details: Table 1-2 Surface Water Quality Standard Unit: mg/l ( except pH ) Item Class Ill ClassIV Permanent value 6 10 CODcr< 20 30 DO> 5 3 BOD5< 4 6 PH 6.5 8.5 Ammonia nitrogen < 0.5 1.0 Cr < 0.05 0.05 Oil< 0.05 0.5 (3) Environmental Noise Standard The Class 3 of "Urban District Environmental Standard" GB3096-93 is adopted in the WWTP site i.e. equivalent sound level (LAeq), 65 dB on daytime, 55dB at nighttime. Class 4 standard is adopted in the north boundary nearby the expressway, i.e. 70 dB on daytime and 55 dB at nighttime .The sewage pumping stations are located at the banks of Yong River and Fenghua River Separately, and Class IV standard is adopted in the areas. 1.5.2 Pollutants Emission Standards (1) Waste Gas Emission Standard Class 2 of "Malodor Pollutants Emission Standard" GB 145593 is adopted for the WWTP (for newly built or expansion projects) See Table 1-3 for details: Table 1-3 Malodor Pollutants Emission Standard Control items Unit Class 2 (newly built 3___________ _ or expansion) Ammonia Mg/M3 1.5 Sulfured hydrogen Mg/m3 0.06 Concentration Dimensionless unit 20 (2) Standards for Influent Sewage and Effluent Discharges  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project " Quality of Sewage discharged into the Urban Sewers Standard" Cj 3082-1999 is adopted for the influent sewage of the WVVWTP; "Integration Sewage Discharge Standard" GB 8978-1996" is adopted for effluent after treatment .See Table 1-4 for details: Table 1-4 Standards for Influent Sewage and Effluent Discharge (unit: Mg/i) Standard pH CODc BOD SS NH3-N Photsepha CJ3082-1999 6.0-9. GB8978-1996 6.0-9. 120 30 30 25 1.0 C lass 2 0 _ _ _ _ _ I_ _ I__ _ _ _ _ The discharge of sludge of the WWTP will implement "Sewage and Sludge Discharge Standard for Urban WWTP" CJ3025-93. (3) Noise Control Standard Construction Stage : "Noise Limit Value for Construction Site Boundary" GB 12523-90 is adopted. Operation Stage : Class III of "Noise Standard On Factory Boundary for Industrial Enterprises" is adopted i.e. 65dB on the daytime and 55 dB at nighttime. 1.6 Environmental Protection Objectives The project environment project objectives are shown in table 1-5: Table 1-5 Environment Protection Objectives in Assessment Area Protection Objectives Main character Lingjia Village About 100 households Inland Rivers Class III Ambient air quality Class II Fenghua River Class IV Environment Noise Class III 1.7 Stages of EIA Construction stage: from the start construction to the operation of the project. Operation stage: Sewage collected and treatment (2006-2010) 12  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project 1.8 Main technology and methods adopted in EIA 1) Matrix method is adopted for identify environment impact factors and assessment factors filtration; the assessment factors will be determined according to identification, filtration to various aspects such as the scope of the affected area, affected extent and factors and etc. 2) The engineering information of the project will be used for Engineering analysis; 3) The assessment of current status will use both the existing monitoring results and monitoring results on site; 4) Mathematical models will be used for impact projection 1.9 Brief Introduction to the institution conducting the EIA The EIA has been prepared by Research & Design Academy of Environmental Protection Science of Ningbo (It is also call NEAS for short) and it grew out of Ningbo Industrial Scientific Research Institute, which was founded in 1958. In 1987 it incorporated with Institute of Environmental Protection Science of Ningbo and began to use the present name. NEAS is an integrated environment protection scientific research institution covering the areas of EIA, environmental engineering design, development of new technology and products of environmental protection, project contract and supervision and analysis testing. It has considerable advanced scientific and testing equipment and computer network. The main scientific research work on environmental field conducted by the institution includes: EIA of construction projects, environment pollution prevention and abatement engineering design, ISO 14000 consultation, development and extension of environment protection technology, new materials and equipment, environmental project contract and supervision, software development on environment monitoring, EIA and etc. There is over 60 staff in 13  Environment Impact Assessment for Ningbo Jiangdongnanqu WWTP & Sewerage Project the unit, of whom, professional technician's accounts for 90%; 56% of them have senior titles .The specialty structure of the technicians is reasonable. NESA has national first grade certification (No.2004) and it has the qualification for the following business scope: surface water, ground water, marine water, gas. acoustics, solid wastes. zoology, water and soil conservation, social economy, human health; light industry, textile, chemical fibers, chemical engineering, petrochemical and pharmacy; machinery, electronics; transportation; ocean and coast engineering; construction, public utilities and etc. The middle and large scale projects carried out by the institution cover areas of chemical industry, expressway, airport, seaport, bridge, railway, urban sewage treatment, garbage landfill, sea-route integrated rehabilitation and etc., and there are many successful examples, such as: Jiangdongbeiqu WVWTP, Yuyao Urban Domestic Garbage Landfill, Ningbo section of Hangzhou-Ningbo Canal, 40000 tons shipbuilding project of Zhejiang Dockyard, Xiangshan Link of Nation Coastal Line Highway Project, 50000ABS t/y project of Ningbo LG Chemical Co. Ltd ,Second Phase Project of Ningbo Lishe Airport .Changhong Tunnel and etc . NESA has five national patents and it has been honored with the title of provincial advanced unit for environment protection for many years and been awarded the name of advanced scientific research unit of Ningbo .It is a municipal advanced unit named by the municipal authorities. 14  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA 2 Project Description 2.1 Basic Characters of the Project Name of the project: Ningbo Jiangdongnanqu WWTP & Sewerage Project Character of the construction: Newly built Project investment: The total investment is RMB 402.11 million (including RMB 38.08 million for preliminary land acquisition and resettlement cost), of which, construction cost is RMB 283.84 million (RMB 135.92 million for WWTP and RMB 147.9 million for the sewerage) and the other cost is RMB 118.28 million. Source of fund: It is planned to use the World Bank loan of USD 26.13million converting into RMB216.59 million .The rest fund will be raised from the construction capital of the city. Construction content and capacity: It is planned to build Jiangdongnanqu WWTP and sewerage which covers a land area of 11.32 hectares in the first phase of the project and the proposed wastewater treatment capacity is 160000/d. The service range includes southwest part of Sanjiangpian, Center district of Yin County, Ci Cheng Town, Dongqian Lake Town and surrounding area of Dongqian Lake .The treatment standard is secondary and A/O dephosphorization process is to be adopted. Tail water after treatment is discharged into Fenghua River. While carrying out the construction in Phase I of the project, more spaces shall be reserved for expanding the capacity to 400000m3/d in the Phase II of the project. The sewerage includes construction of some 43.22 km of new trunk including two river crossings with total length of 0.6km. New sewers will constructed in the following locations: South Jiangdongnan Road, Jichang Road, Xingning Road, Baiyun Road ,Huanchengnan Road, Yinfeng Road and Huanchengnan Road, rehabilitation of part of the existing combined trunk sewers network. With the renovation of the sewer network ,three sewage lift pumping stations will be renovated, i.e. Ningzhong Sewage pumping station and Wudongzha pumping station and Huanzhengnan Road Sewage Pumping Station, The sewage networks construction of the center district of Yin County, Ci Cheng Town, Tongqian Lake and surrounding area is shown on the FSRs of each subproject. Construction location: The project is located at southern part of Jiangdong District of Ningbo on the south side of Hangzhou-Ningbo Expressway and east side of Fenghuan River. 15  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA See geographical position drawing for details, Personnel: The fixed number of persons for the WWTP is 70 and 140 for sewerage outside the plant. Discharge outlet: The treated effluent will be discharged into the Fenghua River. The control objective of the water body is Class IV. Raw water quality : BOD5: 120mg/L, CODcr:240mg/L, SS: l50mg/L, NH3-N:30mg/L, TP:4mg/L0 Treated effluent : BOD5< 30mg/L, CODcr:< 120mg/L, SS< 30mg/L, NH3-N< 2.5mg/L, TP< 1.Omg/L. Sludge outlet: The treated sludge can be transported to landfill site for disposal. 2.2 Components of the Project 2.2.1 Discharge Networks and Pumping Stations 2.2.1.1 Service scope The service scope of Jiangdongnan District Sewage Treatment Plant consists of six water discharge systems. i.e. Ningzhongpian subsystem, Wudongzhapian subsystem, Huanchengnanlu subsystem, Xiwaihuan Road subsystem, Yin County central area subsystem, Cichen, town subsystem. The service scope of Ningzhongpian subsystem covers about 2.72km2 along Jiefang Road; about 1.88km2 along Changchunl Road and Lingqiao Road, with water catchment area of about 4.61km2 and service population of 53000. The service scope of Wudongzha area subsystem covers the west of Caihongnan Road, east of Fenghua River, west of Zhongxing Road, south of Zhongshandong Road and north of Xingning Road, with water catchment area of about 5.6km2, and service population of 71000. Service scope of Xiwaihuan Road subsystem covers 8.1km2 along Xiwaihuan Road, 7.8km2 along Huanchengxi Road and 2.6km 2 along Yinfeng Road, with total water catchment area of about 18.5km2. In addition, a branch sewer pipeline, which carries sewage 16  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA with volume 100OOm3/d from Cicheng Town, links into main at north Xiwaihuan Road, Service scope of Huanchengnan Road subsystem covers east of Fenghua River, west of Dongwaihuan Road, along Huanchengnan Road, including 1.79km2 along Jinagdong Road and 4.9 1km2 along Huanchengnan Road, with water catchment area of about 6.72km2 and service population of 67000. Service scope of Yin County central area subsystem covers Zhongguanmiao Town, Shiqianz Town and XiayingTown , with water catchment area of about 30km2. Service scopes of Cicheng town and Dongqianhu town are detailed in each sub-project FSRs. 2.2.1.2 schemes of sewerage Building network The objective of sewerage network transformation engineering is: (I)To transform the current discharging status of urban sewerage Since there is no WWPT in the area of jingdongnanqu, sewage of the old urban area either discharge directly into the nearby area of rivers or concentrate into pump station, then fluent into Fenghua River by lifted pump. For exemple, Now, Ningzhong Pump Station is a combined branch pump station where sewage discharge into the inner river by lifted pump; Wudongzha Pump Station is a sewage pump station where sewerage discharg into rivers by lifted pump. The sewage pump station of Huanchengnan Road is built in a new area where both rain and sewage discharge network fully developed. Howerer, the water has been contaminated seriously by those sewage discharged at random whice cause the water quality of Ningbo Three-river area can not reach the standards. By the time the engineering is built ,the sewage in the area of Jiangdongnan Road should fluent orgnizedly into waste water treatment plant and discharge into Fenghua River after being treated. The health and invest environment of NingBo should be improved greatly. (2) To build the separate system To match the implement of the road transformation and newly building sewerage network, the separate system of sewerage network should be achieved basicly. The engineering implement such as Jiefang Road, Zhongshan Rode, Renmin Road and Baizhang 17  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA Road achieve the goal of the separate system of sewerage network. Howerer, sewage combined rain systems are general in the old urban area because those engineerings can not be finished at once. the separate system of sewerage network should be achieved in the old urban area, especially the main trunk with the implement of the transformation of the network. The objective of this phase engineering is to improve the city discharge network into which both the residence and industrial sewage fluent in this functional area and ensure the WWTP proper working. achieve the separate system of sewerage network successfully to portect ecological environment. This phrase engineering schemes of the sewerage network transformation and the main trunk is made according to "Master Plan for Urban Development of Ningbo" , combined with the location of WWPT and the characters of the current sewerage network stutas. The the main trunk sewerage network should be transformed firstly, then the branch trunk by which sewage dischage into the new main trunk so as to gather as much as sewage into the plant; Transform the Ningzhong Pump Station andWudongzha Pump Statio and build the new pump station of Wangchun and Choubi; The main trunk should be built near pump stations to lower the head of pumps, the consumption quantity of electrity and the lenth of discharge pipes. According to above principle, the main trunk should be designed at Jiangdongnan Road to gether sewage nearby this area and of the five pump stations. Transform the main trunk of the old urban area and increase the secondary sewage trunk in the newly building area such as Xiwaihua Road, Yinfeng Road, Huanchengnan Road and Baiyun Road. Since the new urban area of Xiwaihuan Road and Huanchengnan Road develop fastly, some exeed field should be left when building the main trunks of Xiwaihuan Road, Huanchengnan Road and the Choubi Pump Station near Huanchengnan Road. 2.2.1.3 Sewerage Network Engineering 1. Layout of Trunk Sewer The pipe network construction consists of two parts, one is the renovation of combined sewer and the other one is lying of new trunk sewer. The renovation for combined sewer covers Lingqiao Road trunk sewer, all branch-trunk sewers within Ningzhong and Wudongzha areas The section to be newly built covers river-crossing sewer for Ningzhong combined sewage pump station, east trunk sewer of Xingninglu, Jiangdongnan Road trunk 18  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA sewer, Xiwaihuan Road trunk sewer, Baiyunlu sub-trunk sewer, Yinfenglu trunk sewer, Huanchengnanlu trunk sewer, river-crossing sewer of Huanchengnanlu sewage pump station and main sewer to the sewage treatment plant. Pipe network in Yin County central area is not included in this project scope, and design for that part has been completed and implementation of the design is being carried out. Pipe networks in Cicheng town and Dongqian Lake town is shown in their sub-item project reports. Trunk sewer for pipe network renovation is shown in Table 2-1 Table 2-lTrunk Sewer for new construction Diameter No. Sewer Start - end Length (m) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _(m m ) Zhenming Road - Jiefangnan 350 800 1 Changchunl Road u Road Jiefangnan Road - Ningzhong 80 l00 pump station Pipeline Ningzhong pump station - 2 crossing 170x2 700 . ~~~Jiangdongnanlu river Xinhe Road - Wudongzha 534 700 pump station Wudongzha pump station - 485 1400 Fenghua River railway bridge Fenghua River railway bridge - 701 lS00 3 Jiangdongna Qiwen Road n Road Qiwen Road - plan 6 666 1600 Nanwaihuan Road Plan Nanwaihuan Road - 5520 575 2200 Highway Highway - Sewage treatment 1194 2200 station 19  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA East of Fenghua River Rive - 848 500 4 Qiwen Road Jiangdongnan Road Plan road - Jiangdongnan Road 905 1100 Chenxiang - Yinjiang Road 204 400 Yinjiang Road - 453 500 Chenglangnan Road Chenglangnan Road - 314 600 Yinfeng Yongchunxiang 5 Road Yongchunxiang - Qiwen 1143 800 Village Duantang Station - Duantang 187 300 town Duantang town - Shundelu 223 400 Shundelu - Qiwen Village 456 500 Yaojiang south bank - 780 1000 Huangchengbei Road Huangchengbei Road - Tongtu 641 120 Road Tongtu Road - Wangchun Xiwaihuan 868 1200 6 Road Road Wangchun Road - Lantian 859 1500 Road Lantian Road - Lianfeng Road 519 1500 Lianfeng Road - Nanwaihuan Road ~~1762 1500 Road 7 Wangchun Current section 631 600 Road Wangchun Road 591 600 Lanti an 8 Roan Current section 795 300 Road 9 Nanwaihuan Xiwaihuan Road - Baiyun Road 659 1800 Road Baiyun Road - Huangchengxi 882 2000 Road 20  Ningbo Jiangdongnanqu WVTP and Sewerage Project EIA Huangchengnan Road sewage pump station - Jiangdongnan 756 2000 Road Plan Nanwaihuan Road - west 599 500 section of Jiangdongnan Road Nanwaihuan Dongwaihuan Road - Qioubi 1831 900 Road pump station Qioubi pump station - 3350 1000 Jiangdongnan Road Pipeline Huangchengnan Road sewage 10 crossing . . 260 1600 river pump station - Jiangdong South bank of Xitanghe - plan 163 300 Xiao Road plan Xiaolu - Lantianlu Road 422 400 Lantian Road - Lianfeng Road 398 400 Baiyun Lianfeng Road - Zuguanshan 547 400 Road Road Zuguanshan Road - Qixiang 193 300 Road Qixianglu - Qiwenlu 353 300 Qiwenlu - Nanwaihuan Road 702 400 2 Summary of the construction for main trunk sewer in current phrase (1) Trunk sewer in Xiwaihuan Road Xiwaihuan Road is a main road in Ningbo, which lies in west of the city, crossing north to south. Trunk sewer will be laid in the green belt of west Xiwaihuan Road, whose service range covers within west to Baiyunlu, south, to Beiwaihuanlu, north to Hangzhou-Yong River express highway, carrying domestic sewage and industrial sewage. Compressive main sewer pipe with diameter 600mm of Citing Town and sewer pipe with diameter 1000mm of Zhongshanxilu link into this trunk, then it connects general trunk sewer of Nanwaihaunlu. Trunk sewer in Xiwaihuan Road is 6980m long in total, collecting sewage area of 21  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA 1348ha and sewage from Cicheng Town with flux of 134.1L/s. the diameter of trunk sewer pipe varies from DNIOOO to DN1600. The designed maximum flux is 1509L/s, with a slope varying 0.0006-0.0008. This trunk sewer will be constructed by excavation method in the section of north Huanchengbeilu, the section from Zhongshanlu to Nanwaihuan Road, with designed burying depth of 3.15-3.97m. The soil texture in these sections is good, without influence from ground water. The foundation of pipe adopt cushion with grouted rubble and pipe base with concrete, and the groove can be supported with steel-plate pile according to sand quality. The design depth for section from Huanchengbeilu to Zhongshanlu is 4.17-5.53m, which is so deep that leading to much influence by ground water, and the push-pipe construction method is suggested. (2) Trunk sewer in Baiyunlu Baiyunlu is an urban minor road from Xiwaihuan Road to Huanchengxilu, crossing north to south. Trunk sewer will be laid under carriageway of west road, whose service range covers within south to Zhongshanlu, north to Qiyunlu and west to Huanchengxilu, carrying domestic sewage and industrial sewage and it connects general trunk sewer of Nanwaihaunlu. Trunk sewer in Baiyunlu is 3703m long in total, collecting sewage area of 223.5ha. The diameter of trunk sewer pipe varies from DN300 to DN400. The designed maximum flux is 70L/s, with a slope varying 0.002>0.003. This trunk sewer will be constructed by excavation method due to its good soil quality and low designed depth of 2-4.5m. The foundation of pipe adopts cushion with grouted rubble and pipe base with concrete, and two measures can be taken if part section are affected by ground water: firstly proceed foundation treatment, grouting with 30cm slice and 10cm gravel; secondly support the groove with sparse or dense steel-plate pile according to sand quality. Roadbed below 50cm deep should be backfilled with 2:8 lime soil due to the sewer bury under the road surface. (3) Trunk sewer in Yinfenglu Yinfenglu is an urban minor road right near western bank of Fenghua River, crossing north to south. Trunk sewer will be laid under road surface, whose service range covers 22  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA within south to Changchunlu, north to express highway and 400m west to Fenghua River, carrying domestic sewage and industrial sewage and it connects general trunk sewer of Nanwaihaunlu. Trunk sewer in Yinfenglu is 2980m long in total, collecting sewage area of 135ha. The diameter of trunk sewer pipe varies from DN300 to DN800. The designed maximum flux is 190L/s, with a slope varying 0.00 1-0.003. This trunk sewer will be constructed by excavation method due to the good quality of the construction site and low designed depth of 2-4.5m. The foundation of pipe adopts cushion with grouted rubble and pipe base with concrete, and two measures can be taken if part section are affected by ground water: firstly proceed foundation treatment, grouting with 30cm slice and 10cm gravel; secondly support the groove with sparse or dense steel-plate pile according to sand quality. Roadbed below 50cm deep should be backfilled with 2:8 lime soil due to the sewer buried under the road surface. 4) Trunk sewer in Jiangdongnan Road Jiangdongnan Road is an urban minor road right near eastern bank of Fenghua River, crossing north to south. Trunk sewer will be laid under road surface, whose service range covers within south to Dahelu, north to express highway and 500m east to Fenghua River, carrying domestic sewage and industrial sewage and it connects general trunk sewer of Nanwaihaunlu, with finally transporting to Jiangdongnanqu WWTP. Trunk sewer in Jiangdongnan Road is 5511m long in total, collecting sewage area of about 3600ha. The diameter of trunk sewer pipe varies from DN500 to DN2200. The designed maximum flux is 4301Lls, with a slope varying 0.0006-0.0016. The section of trunk sewer with diameter varying from DN1100 to DN2200 will be constructed by push-pipe construction method due to its deep designed depth of 3-7m, with its much influence by ground water. The other sections of trunk sewer will be constructed by excavation method due to the good quality of the soil in the section and low designed depth of 2-4m. The foundation of pipe adopts cushion with grouted rubble and pipe base with concrete, and two measures can be taken if part section are affected by ground water: firstly proceed foundation treatment, grouting with 30cm slice and 10cm gravel; secondly support the groove 23  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA with sparse or dense steel-plate pile according to sand quality. Roadbed below 50cm deep should be backfilled with 2:8 soil-lime due to the pipes burying just under the road surface. (5) General trunk sewer in Nanwaihuan Road Jiangdongnan Road is an urban major road of south Ningbo city, crossing from east to west. Trunk sewer will be laid under the green belt, whose service range covers within Xiwaihuan Road, Baiyunlu, Yinfenglu, Jiangdongnan Road and Huanchengxilu (constructed), carrying domestic sewage and industrial sewage and it connects general trunk sewer of Jiangdongnan Road, with finally transporting to Jiangdongnan District sewage treatment plant. General trunk sewer in Nanwaihuan Road is 3164m long in total, catchment area of 2525ha. The diameter of trunk sewer pipe varies from DN1800 to DN2200. The designed maximum flux is 3000L/s, with a slope varying 0.0006-0.0009. It will be constructed by push-pipe construction method due to its deep designed depth of 7.5-8.5m, with its much influence by ground water. 2.2.1.4 Renovation and Construction of Sewage Pumping Stations The renovation for sewage pump stations in this design covers rebuilding of Ningzhong combined pump station; Wudongzha sewage pump station and new construction of Wangchun pump station and Qioubi pump station. At present, the existing pump stations undertake pumping sewage and rainwater for Ningzhongpian subsystem, Wudongzhapian subsystem and Huanchengnanlu subsystem. (1) Ningzhong sewage pump station (capacity: Q=520L/s, H=6m) Ningzhong sewage pump station is a conmbined sewage pump station . The service area of it includes Jiefangbei Road, Jiefangnan Road ,Lingqiao Road, Changchun Road . It has six 24  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA pumps at present ,with designed capacity of 55001/s ,the influent pipeis DN 2000mm and the absolute hight of pipe bottom is 1.Om. The sewage will be lifted by the pumps to dicharge into Fenghua River .After the nonovation the main trunks in Jiefang Road , Lingqiao Road and Changchun Road will be separation drainage system , part of the branches will still be conbined pipes which will be connected with the trunk sewers .The disgined capacity after the renovation will be 37000m3 /d. The engineering work: 13m X 7m X 15m(7m underground ,8m above ground )pump house, 13 X 3m X 7m underground suction tank. Vertical sewage pumps (Q=650m3/h,H=7m,N=22kW), 4 sets with 1 standby Machine grids (B=2000mm,gap width 60mm) Iset , dregs 670kg/d. (2)Wudongzha Pumping Station (capcity : Q=760L/s, H=7m) The service area of Wudongzha sewage pumping station mainly covers along the Xingninglu Road. There are 4 sewage pumps with design capacity of 5501/s; the diameter of the inlet pipe is 1000mm. The absolute standard height of pipe bottom is - 0.80m.The effluent is discharged into Fenhua River by lift pumps ;the design capacity after renovation of the pumping station will be 3.3 m3/d. The engineering quantity: 13m X 7m X 15m(underground 7m, ground 8m) one pump house , 13m X 3m X 7m underground suction tank . Vertical sewage pumps (Q=950m3/h,H=7m,N=3OkW), 4 sets with 1 standby Machine grids (B=2000mm,gap width 60mm) 1 , dregs lOlOkg/d (3) Wangzhun Pumping Station (capacity: Q=1290L/s, H=8m) The service range of the pump station covers Yinfenglu and Xiwaihuan Road and sewage of Cicheng Town will cross the river through the lift pump station. There are 3 pumps now and the design capacity is 930L/s.The pumping water will be discharged into the Fenghua River .The design capacity after renovation will be 37000 m3 /d,.engineering work 13m X 7m X 15m(underground 7m, aboveground 8m) pump house ;13m X 3m X 7m underground suction tank . Vertical pumps (Q=950m3/h,H=8m,N=37kW), 6 sets with 1 standby.Three sets will be fixed recently with one standby. .machine grids (B=2000mm,gap width 60mm) 1 set, dregs 1860kg/d. . (4) Qiubi pumping station (Capacity : Q=480L/s, H=7m) 25  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA It is a sewage pumping station equipping with grids room, suck tank and pump house which is half underground structure :diameter 13.5,with 7.Ounder ground and 4.5 above the ground .The specifications of the main equipment: vertical sewage pumps (Q=600m3/h,H=7m,N=22kW), 4 set with one standby .Two will be installed recently with one standby . Machine grids (B = 2000mm,gap width 60mm) 1 set , dregs ,590kg/d. 2.2.2 WWTP Engineering 2.2.2.1 Engineering Planning Based on the Urban Master Planning Compendium of Ningbo City ,a WWTP with a total capacity of 400000 m3/d will be built in the center district of Yinzhou, south of Hanzhou-Ningbo expressway and east side of Fenghua River It covers a land area of 20.96 ha. The capacity of P'hase I is 160000m3/d covering 11.32 ha. There are 6 subsystems for the service sewer networks: Ningzhongpian subsystem (catchment area 4.6 km2 serving population, 53000); subsystem of Wutongzhapian (catchment area 5.6km2, serving population 56000); subsystem of Huanzhengxilu (catchment area, 18.5km2) subsystem of Huanchengnanlu (catchment area 6.7km2 serving population 67000); subsystem of Yinzhou District (catchment area, 30km); the rest is the subsystems of Cicheng and Dongqian Lake. 2.2.2.2 General plane Layout The general plane layout will observe the following principles: smooth technological process. compact arrangement, short sewer, land saving, full greening and beautifying environment. According to the process, sewage, introduced from east of the plant area, flows into the grid for removing grit, then pumped to thin grid and cyclone grit removal tank for removing the grit and flows into the aeration tank. After that, it flows to the secondary sedimentation tank, where the settled sludge flows to the return sludge pump house via the outer layer of the 26  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA distribution well, then pumped back to the aeration tank. The remaining sludge flows to the sludge storage tank and dewatering house for dewatering, the sludge cake thus produced is trucked to the disposal site. The sterilized water in the secondary sedimentation tank flows westward to Fenghua River. The blower house is located between the two aeration tanks so as to shorten air pipeline and reduce air pressure loss. Its location is given consideration to Phase II project. The return sludge pump house is arranged between the aeration tank and the secondary sedimentation tank so as to make the return sludge flow short distance. The sludge-dewatering house is located at side of transport road, thus is easier to transport the sludge out of the plant. Storage yard is located beside the grid chamber, cyclone grit removing tank and dewatering house for easy stockpiling, truck loading and transport of waste, grit and sludge. The substation is arranged near the load center with easy incoming of cable considered. The repair shop, warehouse, shed and sludge transport equipment depot is arranged alternatively in the east of the plant area so as to make full use of the site within the enclosing wall. The repair shop covers machinery repair and electrical equipment repair, etc. The administrative area of the plant includes complex building, garage, and bicycle shed and janitor' s room. The complex building covers office, chemical analysis lab, bachelor quarters dining room, bathroom, central control room and instrument repair, and four stories in all. The square and parking lot are provided in front of the complex building and a small garden is located in the south of the complex building. It is fully greened in the plant area to beautify the environment. Space for its expansion is reserved in the south of the plant area. The.general plane layout is shown in the drawings attached. 2.2.2.3 Process Design See Table 2-3 for details of the construction structures. Electricity Design 1. Power supply for the Plant The power load for the sewage treatment plant is Class II. In the design, two circuits of lOkV power supply are adopted (one working and the other for standby). 2. Power load calculation 27  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA The demand coefficient method is used to calculate the power loads. The calculated effective power load of the whole sewage treatment plant Pjs=1754kW, the calculated ineffective power load Qjs=57OkVar (after compensation) and the Calculated apparent power load Sjs=1844kW. The power factor COSO=0.95 or above among which the calculated power loads at the general transformer station (MCC2) are as follows: Effective power: Pjs=1308kW Ineffective power: Qjs=420kVar(after compensation) Apparent power: Sj s= 1373kVA The calculated load of the transformer substation (MCC2) Effective power: Pjs=445kW Ineffective power: Qjs=l4OkVar(after compensation) Apparent power: Sjs=467kVA 3. Wiring for the plant Single sectional bus line wiring is used in lOkV power. Two circuits of lOkV power are adopted (one for working; the other for standby). Switch on the sectional bus line and the power supply begins to operate. Single sectional bus line wiring is also used in 0.4kV power with the transformers connected to the two corresponding sectional bus lines in lOkV power. The transformers run separately, each as the standby for the other. The power supply and the illumination supply share the transformers whose neutral point is directly grounding 4. Equipment selection and substation The middle located hand-vehicle switch cabinet is used in IOkV. The type is KZN1-12 metal-armor enclosed switch cabinet. The VT2-12 vacuum circuit breaker is selected with the rated current being 630A and the rated turnoff current 31.5kA. MNS type low voltage drawer switch cabinet is used in 0.4kV. Capacitance automatic compensation cabinet is adopted for the low voltage capacitor and paralleled with the low voltage switch cabinet. The transformer is SC9 type dried energy-saving transformer. Large 28  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA power consumers in the sewage treatment plant are the inlet water pump house and the air blower house, so to reduce the low-voltage line loss and the low-voltage bus line voltage fluctuation induced by large power electromotor start-up, the 10kV power should be deep in the load center. Therefore in the machinery maintenance room near the inlet water pump house a transformer station is built where 2xSC9, 400kVA, 10/0.4kV transformers and low-voltage motor control center MCC1 are assembled. In the neighborhood of the air blower house a general transformer station is built where a 10kV high-voltage cabinet, 2xSC9, IOOOkVA, 10/0.4kV transformers and low-voltage motor control center MCC2 are installed. Although the sludge returning houses and the sludge-dewatering house consume not too much power, yet there are a number of motors. To achieve functional control, motor control centers MCC3, MCC4 and MCC5 with the power supplied from the general transformer station, are therefore built near the two sludge returning houses and the sludge dewatering house. Due to the construction of the project by stages and the larger scale in stage II, equipment in the transformer stations are only used for stage I. During stage II, another general transformer station will be built from which power uses in stage I will switch to be supplied. 5 Electric Energy Measurements High demand and high measurement is used in this project. Two measuring cabinets are on the two 10kV bus lines with a 0.2 rating CT and PT set for measurement. In the relay closet of the cabinet, an effective power ammeter and an ineffective power ammeter are installed . 6. Operating Power Sources Spring energy storage direct current operation is used in 10kV switch cabinet and the working power is 220V DC that comes from the direct current screen. 7. Reactive-current compensation Capacitance automatic compensation cabinets are set up on the low voltage operating voltage bus line at all of the transformer stations. The power factor after compensation is COS0=0.95 or higher. 8. Secondary Wiring and Relay Protection 10kV switch cabinets, 10kV sectional circuit breakers and 10/0.4kV transformers are controlled by the onsite switch cabinets. And light monitors the secondary circuit. 29  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA 9. Relay protection devices: Delayed fast breaking protection and over-current protection is adopted in 10kV circuit. Fast breaking current, over-current and single phase grounding protection on the low voltage side are employed in 10/0.4kV transformers. All relay protections are monitored and controlled by computers. 10. Over-voltage Protections and Grounding To protect the 10kV equipment from the attack of over-voltage traveling wave in the atmosphere of trolly wire, zinc oxide lightning arresters are installed on the inlet wires of the transformers and on the 10kV bus lines. Ring shaped grounding is used at 10/0.4kV transformer stations. The grounding resistance is R< 4ohm and forms a developed network throughout the plant. 11. Electromotor Starting Methods Electromotor of the inlet water pumps (110kW) and that of the air blower pumps (315kW) are started indirectly, while the others are all started directly. 12. Electromotor Control Methods Key technical devices driving electromotor uses onsite control, MCC control and PLC control, i.e., triple control. The onsite control box is set beside the motors. The on/off buttons, running, stopping and failure indicators, and jerk buttons are all just on the control box panel. There are onsite MCC-PLC control switches, on/off buttons, indicators and amperemeters on the MCC. 13. Illumination and overhaul Network 280/220V triple-phase four-wire system is used in illumination and repair. The inside illumination source uses golden halogen lights and fluorescent lights. The roadway illumination in plant area uses photoelectric ally controlled high-pressure sodium lamps as light sources. In the especially humid area illumination source uses 36V or 12V. 30  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA 14. Cable Wiring Cable trenches and trays are used for cable wiring within the building while cable trenches, burying and trays are used in the plant area. The buried cables are metal armored; meanwhile those in the cable trenches and trays are not armored. The electric cable types are VV22-1 and VV-1 whereas the control cable type is KVV22KVV. 31  Ningbo Jiangdongnanqu WWTP and Sewerage Project EIA Table 2-3 The Main Structures and Equipment of the WWTP Name of Am Design structure oun water Main Equipment Design parameters struture t flow Water trap Plane size5m X 3m Water inlet 2 Unit width 1.8m ditch Coarse grid 2 tightwire type grit removers, 1 screw Grit remover clearance 20mm, a=70