1. Legislative/regulatory requirements and best practices

1.1 Quality standards

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1.1.1 General case

STERUs must comply with quality standards for treated effluent prior to discharge into the natural environment. These standards cover various parameters, such as suspended solids, biological oxygen demand (BOD ₅ ), chemical oxygen demand (COD), total nitrogen and total phosphorus.

The requirements for effluent from STERU, introduced by the ERU Directive for agglomerations of 2,000 to 10,000 population equivalent...