Helness H, Sun C, Damman S, Ahmadi M, Raspati G, Bjerkelund V, Moldestad G, Hattori K, Kato T, Ando N
SINTEF, P.O. Box 4760, Torgarden, Norway E-mail:
Inrigo AS, Verkstedvegen 4, N-7125 Vanvikan, Norway.
Water Sci Technol. 2019 Mar;79(6):1206-1213. doi: 10.2166/wst.2019.121.
Combined sewer overflows (CSOs) pollute receiving waters and have a negative impact on ecosystem services. In urban areas rehabilitation of the sewer system to avoid CSOs is associated with high investment costs. Furthermore, not all CSOs can be closed due to the need for hydraulic reliability of the system. Local treatment of CSO with high rate filtration offers an alternative to rehabilitation of the sewer system that is flexible with respect to design and has lower investment cost than separating sewage and storm water runoff. Results from DESSIN, a 4-year EU demonstration project, are presented. The results showed on average 50% removal of particulate matter during CSO events, with higher removal (80%) in the initial first flush period. Other constituents, for example heavy metals, were removed through their association with particles. Potential impacts on ecosystem services in the catchment and the sustainability of the solution were assessed.
合流制下水道溢流（CSOs）会污染受纳水体，并对生态系统服务产生负面影响。在城市地区，对下水道系统进行改造以避免合流制下水道溢流，所需投资成本高昂。此外，由于系统需具备水力可靠性，并非所有合流制下水道溢流都能被消除。采用高速过滤对合流制下水道溢流进行就地处理，为下水道系统改造提供了一种替代方案，该方案在设计上具有灵活性，且投资成本低于将污水与雨水径流分离的方案。本文介绍了欧盟一项为期4年的示范项目DESSIN的成果。结果表明，在合流制下水道溢流事件期间，颗粒物平均去除率为50%，在初始的首次冲刷阶段去除率更高（80%）。其他成分，如重金属，则通过与颗粒的结合而被去除。评估了对集水区生态系统服务的潜在影响以及该解决方案的可持续性。
