Institute for Environmental Sciences, University of Koblenz-Landau , Fortstrasse 7, D-76829 Landau/Palatinate, Germany.
Environ Sci Technol. 2011 Apr 15;45(8):3774-80. doi: 10.1021/es104195h. Epub 2011 Mar 1.
Tertiary treatment methods, like ozonation, are currently under discussion to improve removal efficiencies of micropollutants by municipal wastewater treatment plants (WWTPs). In order to assess the effects of a full-scale wastewater ozonation at WWTP Wüeri, Switzerland, on the receiving stream, a total of seven in situ bioassays with Gammarus fossarum that lasted 7-days were conducted during an overall period of 33 months. Caged gammarids were exposed between 150 m up- and 400 m downstream of a WWTP effluent before, during and following the operation of the full-scale wastewater ozonation. During the release of nonozone treated wastewater, gammarid feeding was significantly reduced by up to 90% 50 and 150 m downstream of the WWTP effluent. In contrast, during the operation period of the ozonation, no significant alterations in feeding were observed downstream. The results of these bioassays were incorporated into a mathematical simulation of the release of nonozone treated wastewater in a Central European region, suggesting a 40% reduction in leaf litter breakdown and hence in energy provision for the remaining aquatic food web downstream of WWTP effluents, while the release of ozone treated wastewater did not affect this important ecosystem function.
三级处理方法，如臭氧氧化，目前正在讨论中，以提高城市污水处理厂（WWTP）对微污染物的去除效率。为了评估瑞士 Wüeri 污水处理厂全规模废水臭氧处理对接收流的影响，在 33 个月的总时间内进行了总共 7 次为期 7 天的现场生物测定，使用了弗氏沼虾。在全规模废水臭氧处理运行之前、期间和之后，在污水处理厂出水的上游 150 米和下游 400 米处对笼养的沼虾进行了暴露。在释放未处理的废水期间，在污水处理厂出水的下游 50 米和 150 米处，沼虾的摄食明显减少了 90%。相比之下，在臭氧处理运行期间，下游没有观察到摄食的显著变化。这些生物测定的结果被纳入到一个中欧地区释放未处理废水的数学模拟中，结果表明，在污水处理厂出水下游，落叶分解减少了 40%，因此为剩余的水生食物网提供的能量减少，而释放臭氧处理的废水不会影响这一重要的生态系统功能。
