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Post-ozonation in a municipal wastewater treatment plant improves water quality in the receiving stream

机译:城市污水处理厂的臭氧化后改善了接收流中的水质

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摘要

Background: Removal of organic micropollutants from wastewater by post-ozonation has been investigated in a municipal wastewater treatment plant (WWTP) temporarily upgraded with full-scale ozonation, followed by sand filtration, as an additional treatment step of the secondary effluent. Here, the SPEAR (species at risk) indicator was used to analyse macroinvertebrate abundance data that were collected in the receiving stream before, during and after ozonation to investigate whether ozonation improved the water quality. Results: The SPEAR values indicate a better water quality downstream the WWTP during ozonation. With ozonation the relative abundance of vulnerable macroinvertebrates in the stream receiving the treated wastewater increases from 18 % (CI 15–21 %) to 30 % (CI 28–32 %). This increase of 12 % (CI 8–16 %) indicates improved ecological quality of the stream and shifts classification according to the Water Framework Directive from poor to moderate. Conclusions: The SPEAR concept, originally developed to indicate pesticide stress, also appears to indicate toxic stress by a mixture of various micropollutants including pharmaceuticals, personal care products and pesticides. The responsiveness of the SPEAR indicator means that those macroinvertebrates that are vulnerable to pesticide pollution are also vulnerable to micropollutants from WWTPs. The change in the macroinvertebrate community downstream the WWTP indicates that toxicity by pollutants decreased by more than one order of magnitude during ozonation. Ozonation followed by sand filtration has favourable impacts on the composition of the macroinvertebrate community and can improve the water quality in the receiving stream.
机译:背景:在市政污水处理厂(WWTP)中,采用后臭氧氧化处理去除了有机微污染物,该污水处理厂暂时进行了全面的臭氧氧化处理,然后进行了砂滤,作为次级污水的附加处理步骤。在这里,SPEAR(高危物种)指标用于分析臭氧化之前,期间和之后在接收流中收集的大型无脊椎动物的丰度数据,以研究臭氧化是否改善了水质。结果:SPEAR值表明在臭氧化期间WWTP下游的水质更好。进行臭氧化处理后,接收处理后的废水的脆弱无脊椎动物的相对丰度从18%(CI 15–21%)增加到30%(CI 28–32%)。 12%(CI 8-16%)的增加表明河流的生态质量得到改善,并且根据《水框架指令》将分类从不良变为中等。结论:SPEAR概念最初是用来指示农药胁迫的,但似乎也通过多种微量污染物(包括药品,个人护理产品和农药)的混合物来指示毒性胁迫。 SPEAR指标的响应能力意味着那些容易受到农药污染的大型无脊椎动物也容易受到污水处理厂的微污染物的影响。污水处理厂下游大型无脊椎动物群落的变化表明,臭氧氧化过程中污染物的毒性降低了一个数量级以上。臭氧化后再进行沙滤对大型无脊椎动物群落的组成具有有利影响,并可以改善接收流中的水质。

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    Ashauer Roman;

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  • 年度 2016
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