Emissions of organic and inorganic substances from municipal waste water treatment plants

The report of the Federal Environment Agency examines more than 100 individual substances in the processes of selected municipal wastewater treatment plants. As a first step, a substance restriction was carried out to 16 individual substances, of which five priority substances and six other substances were identified as relevant in purified waste water on the basis of the environmental quality standards for surface water. Four of these priority substances (cadmium, diuron, nonylphenols and tributyltin compounds) are proposed for mandatory measurement under the Emissions Register Regulation. In addition, mass balances were carried out for the 16 substances at two wastewater treatment plants. It was shown that only nonylphenols are at least partially degraded, the other substances or groups of substances studied either accumulate in sewage sludge or enter the water via the effluent.联邦环境署（Federal Environment Agency）的报告针对选定的多座城市污水处理厂的处理流程中的100余种单一物质开展检测分析。研究首先完成物质筛选，最终锁定16种目标单一物质；依据地表水水环境质量标准，其中5种优先控制物质（priority substances）与另外6种物质被认定为净化后废水中的环境关注物质。上述5种优先控制物质中的4种——镉（cadmium）、敌草隆（diuron）、壬基酚类（nonylphenols）以及三丁基锡化合物（tributyltin compounds）——根据《排放登记条例》（Emissions Register Regulation），被提议纳入强制监测范畴。此外，研究还针对两座污水处理厂的16种物质开展了物质质量衡算。结果显示，仅壬基酚类发生了至少部分降解，其余被研究的物质或物质类群要么在污水污泥中富集，要么随处理出水进入水环境。