China - Zhejiang Urban Environment Project : environmental assessment (Vol. 3 of 9)

E740 v.3 July 2003 Kew issues of Zhenhai WWTP and Sewerage Ningbo Design and Research Institute for Environment Protection July 2002 Cij ~~~~~~~~  11Zhenhai EA -- -rl -- ;-. ;rv_; 1'-. Current. State.:ofLthe.'Surfa water- ' 1.1.Water Quality of Inland Rivers (0 The most recent monitoring data in 5 years The monitoring results of Guisi and Zhangjiangan sections of Zhongda River are chosen for the EA because these two sections are near the urban area and the EA is based on GB3838-2002 Environment Quality Standard for Surface Water (The control target for both monitoring points is Class IV). The standard index method for single item evaluation is adopted in the monitoring .See Table 3-4 and 3-8 for the details: Table 3-4 The Normal Monitoring and Evaluation Results of the Water Quality of Zhongdahe River 1997 Hexalent Ammonia volatilization Section Item PH DO CODm,, BOD5 nitrogen hydroxybenzene Cyanide Hg Pb Cd As Cr Sample 3 3 3 3 3 3 3 1 1 1 3 3 Max 7.52 5.41 10.1 6.50 2.92 <0.002 0.005 <0.05 <5 <0.5 <7 <4 Minimum 7.26 2.20 4.78 0.33 0.98 <0.002 <0.004 <0.05 <5 <0.5 <7 <4 Mean value 7.4 3.54 7.43 3.08 1.94 <0.002 0.004 <0.05 <5 <0.5 <7 <4 Classification of Mean / IV IV III V I I I I I I I Guei si value Standard 0.267 / 0.743 0.513 1.940 / 0.020 / / / / / index _____ Max times for exceeding 0 0.27 0.01 0.08 0.95 0 0 0 0 0 0 0 standard Zhang Sample 3 3 3 3 3 3 3 1 1 1 3 3 jian Max 7.55 5.90 10.1 4.28 2.38 <0.002 0.012 <0.05 <5 <0.5 <7 14 gan Minimum 7.41 2.01 4.83 2.42 1.48 <0.002 <0.004 <0.05 <5 <0.5 <7 <4 Mean value 7.46 4.42 7.63 3.11 1.81 <0.002 0.007 <0.05 <5 <0.5 <7 6.3 Zhenhai EA 1  1O1lenhai EA Classification of Mean / IV HV III V I I I I I I I value Standard 0.307 / 0.763 0.518 1.810 / 0.035 / / / / 0.126 index__ __ _ _ _ _ _ _ Max times for exceeding 0 0.33 0.01 0 0.59 0 0 0 0 0 0 0 standard I _ Note :The unit of disso]ved oxygen ,CODm,,, BOD5, ammonia nitrogen ,volatilization hydroxybenzene ,cyanide in the table is mg/L; The unit of Hg, lead cadmium, and arsenic hexavalent chromic is ug/L and the unit of pH is dimensionless. Table 3-4 shows: the annual water quality in the monitoring points of Guisi and Zhangjiangan is above the standard (Class V). The main item above the standard is ammonia nitrogen; the max exceeding times over the standard in the two sections are 0.95 and 0.59; DO and BOD5 exceed the standards very few. No heavy metals exceed the standards. Table 3-5 The Normal Monitoring and Evaluation Results of the Water Quality of Zhongdahe River 1998 (unit see Table 3-4 .Zhenhai EA 2  101Zhenhai EA Table 3-5 shows the water quality state in the monitoring points of Guisi and Zhangjiangan exceed the standards (Class V) in the whole year. The main exceeding item is ammonia nitrogen .The Max exceeding times over the standard in the two sections are 1.44 and 4.83,and CODmn in the Guisi section is Class V water quality and Max times for exceeding the standard is 0.52. Very few DO and BOD5 monitoring results exceed the Ammonia volatilization Hexalent section Item pH DD CODMn BOD5 Cyanide Hg Pub Cd As _______ ~~~~~~~~~nitrogen hydroxybenzene CyndCgru dA Sample 3 3 3 3 3 3 3 1 1 1 3 3 Max 7.68 7.10 15.2 8.81 3.66 0.004 <0.004 <0.05<1.0 <0.10<7 <4 Minimum 7.38 0.75 7.05 3.2 1.97 <0.002 <0.004 <0.05 <1.0 <0.10 <7 <4 Mean value 7.48 3.65 10.33 5.62 2.78 0.003 <0.004 <0.05 <1.0 <0.10 <7 <4 Classification Guei of Mean / IV V IV aboveV III I I I I I I si value Standard 0.320 / 1.033 0.937 2.780 / / / / / / / index Max times for exceeding 0 0.75 0.52 0.47 1.44 0 0 0 0 0 0 0 standard I I Sample 3 3 3 3 3 3 3 1 1 1 3 3 Max 7.73 6.5 12.5 2.42 8.07 0.005 0.019 <0.05<1.0<0.10<7 14 Minimum 7.1 2.67 8.29 1.73 2.58 <0.002 <0.004 <0.05 < 1.0 <0.10 <7 <4 Mean value 7.51 4.86 9.72 1.98 4.86 0.003 0.011 <0.05<1.0<0.10<7 6.3 Classification zhang of Mean / IV IV 1 V+ III II I I I I II j ian value _ gan I-_ _ _ Standard index 0.340 / 0.972 0.330 4.860 / 0.055 / / / / 0.126 Max times forexceeding 0 0.11 0.25 0 4.38 0 0 0 0 0 0 0 standard l _ - .Zhenhai EA 3  1O1lhenhai EA standards .No heavy metals exceed the standards. Table 3-6 The Normal Monitoring and Evaluation Results of the Water Quality of Zhongdahe River 1999 (unit see Table 3-4) Ammonia Volatilization Hexalent Section Item PH Do CODM, BOD5 . Cyanide Hg Pb Cd As _______ ___________ ni~mtrogen hydroxybenzene ____ Cr Sample 3 3 3 3 3 3 3 1 1 1 3 3 Max 7.44 6.43 8.45 9.46 0.003 0.002 <0.004 <0.05 9.9 0.22 <7 12 Minimum 7.24 1.70 7.32 1.94 0.025 <0.002 <0.004 <0.05 9.9 0.22 <7 <4 Mean value 7.37 3.36 7.82 5.64 0.038 0.002 <0.004 <0.05 9.9 0.22 <7 8 Classification of Mean / IV IV IV I I I I I I I I value Standard index 0.247 / 0.782 0.940 0.038 0.200 / / 0.198 0.044 / 0.160 Max times for exceeding 0 0.43 0 0.58 0 0 0 0 0 0 0 0 standard Sample 3 3 3 3 3 3 3 1 1 1 3 3 Max 7.49 8.99 10.10 7.55 0.044 0.002 0.005 <0.05 6.4 0.28 <7 29 Minimum 7.19 4.90 6.56 2.96 0.016 <0.002 <0.004 <0.05 6.4 0.28 <7 14 Mean value 7.31 6.88 8.45 5.33 0.027 0.002 0.004 <0.05 6.4 0.28 <7 21 Classification Zhang of Mean / II IV IV I I I I I I I II jian value gan-- _ __ _ _ _ _ _ __ _ Standard index 0.207 / 0.845 0.888 0.027 0.200 0.020 / 0.128 0.056 / 0.420 Max times for exceeding 0 0 0.01 0.26 0 0 0 0 0 0 0 0 standard I _ The table 3-6 shows: the annual water quality in the monitoring points of Guisi and .Zhenhai EA 4  1O lhenhai EA Zhangjiangan has not exceeded the standards ,of which DO, CODmn and BOD 5. exceed the standard very few .. No heavy metals exceed the standards. Table 3- 7 The Nbrral xniitoring and Evaluation Fbsults of the Vdter Qial i t y of Zhongdahe R ver 2000 ( Lli t see Tab e 3- 4) Ammonia Volatilization Hexalent Section Item PH DO CODM. BOD5 Cyanide Hg Pb Cd As _~~___ nitrogen hydroxybenzene ___. Cr Sample 3 3 3 3 3 3 3 1 1 1 3 3 Max 7.43 8.71 8.72 9.38 2.8 0.001 0.002 0.00 2 0.05 0.06 0.002 Minimum 7.02 2.60 3.15 1.32 0.58 0.001 0.002 0.00 0 0 0 0.002 Mean value 7.22 6.14 5.29 4.41 1.52 0.001 0.002 0.00 0 0.02 0 0.002 Classification of Mean / II III IV V I I I I I I I Guei Si value Standard index 0.147 / 0.529 0.735 1.520 0.100 0.010 0 0 0.004 / 0 Max times forexceeding 0 0.13 0 0.56 0.87 0 0 0 0 0 0 0 standard I Sample 3 3 3 3 3 3 3 1 1 1 3 3 Max 7.76 9.07 13.4 5.99 4.21 0.001 0.002 0.00 1 0 0 0.002 Minimum 7.26 1.1 7.12 4.66 2.98 0.001 0.002 0.00 0 0.05 0 0.002 Mean value 7.52 6.04 10.81 5.18 3.423 0.001 0.002 0.00 0 0.02 0 0.002 Classification Zhang of Mean / II V IV iV I I I I I I I jian value gan Standard index 0.347 / 1.081 0.863 3.423 0.100 0.010 0 0 0.004 I 0 Max times for exceeding 0 0.63 0.34 0 1.81 0 0 0 0 0 0 0 standard _ _ - The table 3-7 show: The annual water quality in the monitoring points of Guisi and .Zhenthai EA 5  1O12enhai EA Zhangjiangan exceeds the standard (Class V or over).The main exceeding items are ammonia nitrogen and CODmn ,The Max exceeding times of CODmn over the standard in the two sections are 0.87 and 1.81;DO and BOD 5. exceed the standard very few .. No heavy metals exceed the standards. Table 3- 8 The Nbr rnl Mni t or i ng and BEal uat i on Fesul t s of t he Vdt er Qja i t y of Zhongdahe R ver 2001 ( uwi t see Tabl e 3- 4) Ammonia volatilization hexalent Section Item pH Do CODMn BOD5 on hydroxybenzene Cyide Hg Pb Cd As Sample 6 6 6 6 6 2 2 2 2 2 2 6 Max 7.45 9.8 12.93 10.8 3.38 <0.002 <0.004 <0.05 <0.4 <0.04 <7 <4 Minimum 6.79 3.8 3.01 2.8 0.94 <0.002 <0.004 <0.05 <0.4 <0.04 <7 <4 Mean value 7.18 5.68 9.42 6.23 2.24 <0.002 <0.004 <0.05 <0.4 <0.04 <7 <4 Classificatio n of Mean / III IV V V+ I I I I I I I Guei si value Standard index 0.120 / 0.942 1.038 2.240 / / / / / / / Max times for 0 0 0.293 0.77 1.25 0 0 0 0 0 0 0 exceeding standard Sample 6 6 6 6 6 1 1 1 1 1 1 6 Max 7.89 12.3 11.44 10.84 8.54 <0.002 <0.004 <0.05 <0.4 <0.04 <7 <4 Minimum 6.57 5.2 7.02 2.58 0.62 <0.002 <0.004 <0.05 <0.4 <0.04 <7 <4 Mean value 7.15 9.37 8.88 6.54 4.50 <0.002 <0.004 <0.05 <0.4 <0.04 <7 <4 Classificatio Zhang n of Mean / I IV V V+ I I I I I I I jian ga value __ jian gan Standard index 0.100 / 0.888 1.090 4.500 / / / l I I l Max times for exceeding 0 0 0.144 0.81 4.7 0 0 0 0 0 0 0 standard _ The table 3-8 shows: the annual water quality in the monitoring points of Guisi and Zhangjiangan exceeds the standard (Class V).The main exceeding items are ammonia nitrogen and BOD5 ,The Max exceeding times of ammonia nitrogen over the standard of the two sections are 1.25 ,4.7 and BOD5 . The max times are 0,77 and 0.81. Moreover, CODmn exceeds standard very few .No heavy metals exceed standards . To sum up , nearly all the monitoring results of sections in the inland river of Zhenhai .Zhenhai EA 6  11Zhenhai EA exceed the standards except the results in 1999.They are mainly organic pollution .These results may caused by domestic sewage and agricultural waste water discharged into the inland river .The following is the analysis on the four pollutants over the standard by the monitoring: Ammonia nitrogen : Chart 3-2 and 3-3 show the monitoring value variations in recent 5 years in the sections of Guisi and Zhangjiangan. 4 uFl, z 3. 5 2 - -- ---- ----;;_ 1.5 O. 5 - _ _ _ ,_ _ Max 0 -U- * r jminimum 1997 1998 1999 2000 2001 standard | mean value Chart 3-2 Recent 5 Years Water Quality Monitoring in Guisi Section 10 Unit i mg/l 8 6 2 7 _____ ~~~~~-Max 8 A-- -Minimum 0 Stndr 1997 1998 1999 2000 200 Standard _____Mean .ZW.,.,. 7  101Zhenha FA Chart 3-3 Recent 5 years Ammonia nitrogen Monitoring Value in the Section of Zhangjiangan Section Chart 3-2and 3-3 show the best results of sampling are in 1999 There is a trend for increase in recent 3 years for ammonia nitrogen monitoring value in the sections of Guisi and Zhangjiangan . BOD5: The chart 3-4 and 3-5 show the recent 5 years variations in the sections of Guisi and Zhangjiangn .In recent 4 years there is a trend for increase of BOD5 value year after year. 12 Unit O mgA 10 8 6 4 2 Max 0 Minimum 1997 1998 1999 2000 2001 Standard s-- Mean Chart 3-4 Recent 5 years' variations of BOD5 monitoring value in Guisi section 12 unitEl 10 I 8 6 4 ______K~~~~Max 2 oe3:' = -_ 02I I I -- Minimum 7 ~~~~~~~~~~~Standard - 1997 1998 1999 2000 2001 8 Mean  101Zhenhai EA Chart 3-5 BOD5 monitoring value variations in the section of Zhangqianan in recent 5 year Chart 3-6and Chart 3-7 show the CODmn monitoring value state in recent 5 years in the sections of Guisi and Zhangqiangan The variation trend is not obvious 16 unitO 14 12 10 - - .- 4 2 |_ Max 0 ---minimun 1997 1998 1999 2000 2001 + mean Table 3-6 the recent 5 years variations on monitoring value of CODM. in Guisi section. unitO 5 |+ Max O minimum 1997 l1998 1999 200 200(1 m e a n  101henhai EA 1!3 3-7 3KTfif iEi CODm. kt591!{ii&+t* The chart 3-8 and DO: 3-8 and 3-9 show the DO monitoring value in the section of Guisi and Zhangjiangan in recent 5 years . There is a trend for increase in the recent five years. 15 unitO 10 -.- Max 5 . --- minimum 0 Standerd 1997 1998 1999 2000 2 * mean Table 3-8 The recent 5 years DO monitoring value variations in section of Guisi 15 Unit D 10 5 __ _ -- Max 0 I IM-- minimum 1997 1998 1999 2000 2001 Standerd mean Chart 3-9 The recent 5-year monitoring value variety of DO in the section of Zhangjiangan