Case C-629/19: Judgment of the Court (Second Chamber) of 14 October 2020 (request for a preliminary ruling from the Landesverwaltungsgericht Steiermark — Austria) — Sappi Austria Produktions-GmbH & Co. KG, Wasserverband ‘Region Gratkorn-Gratwein’ v Landeshauptmann von Steiermark (Reference for a preliminary ruling — Environment — Waste — Directive 2008/98/EC — Article 2(2)(a), point 1 of Article 3 and Article 6(1) — Waste water — Sewage sludge — Scope — Concept of ‘waste’ — Cessation of waste status — Recovery or recycling operation)