Impact of long-duration CSO events under different tidal change conditions on distribution of microbial indicators and PPCPs in Sumida river estuary of Tokyo Bay, Japan
Impact of long-duration CSO events under different tidal change conditions on distribution of microbial indicators and PPCPs in Sumida river estuary of Tokyo Bay, Japan
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DOI：
10.1007/s11356-020-11046-x
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发表时间：
2020-10
影响因子：
5.8
通讯作者：
Chomphunut Poopipattana;Motoaki Suzuki;H. Furumai
中科院分区：
文献类型：
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作者：
Chomphunut Poopipattana;Motoaki Suzuki;H. Furumai
东京湾墨田河口经常受到污水溢流（CSOs）粪便污染的影响。该研究在2017年10月，2018年6月和2018年7月三次长时间降雨事件后，监测了墨田河上游至河口的地表水质量。几种类型的污水标记物，包括粪便细菌和两种类型的噬菌体作为微生物标记物，和五种药物和个人护理产品（PPCPs）作为化学标记物被用来评估粪便污染。CSO排放量是分别从泵站和溢流室估算的。溢流室的主要贡献估计高达总排放量的86 - 91%，表明它们在控制CSO污染方面的重要性。3起事件中，由于CSO排放时间均超过30 h，导致大范围内的污水标志物浓度较高，大肠杆菌浓度高达4.00 ~ 4.57 log 10（CFU/100 mL）。同时，咖啡因在PPCPs中的浓度最高，为2105 ng/L。它被认为是一个有用的指标，最近的污染，捕捉一个独特的空间分布趋势。另一方面，crotamiton，一个保守的PPCP，被发现是高度稀释，可能不适合在暴雨事件下跟踪污染物。阐述了CSO排放模式和潮汐变化对污水标志物分布的影响，包括扩散程度和污染物迁移时间。研究发现，CSO污染物在涨潮时在河口区积累，然后排入河口。
The Sumida river estuary of Tokyo bay is often affected by fecal contamination from combined sewer overflows (CSOs). This study monitored the surface water quality from the upstream of the Sumida river to the estuary in October 2017, June 2018, and July 2018 after three long-duration rainfall events. Several types of sewage markers, including fecal bacteria and two types of bacteriophages as microbial markers, and five pharmaceuticals and personal care products (PPCPs) as chemical markers were used to evaluate fecal contamination. CSO discharge was estimated separately from pumping stations and overflow chambers. The dominant contribution from overflow chambers was estimated to be as high as 86 – 91% of total discharge volume indicating their significance in controlling CSO pollution. High concentrations of sewage marker were observed in a wide area due to CSO discharge of more than 30 h in all 3 events.Escherichia coliwas found to be as high as 4.00 – 4.57 log10(CFU/100 mL). Meanwhile, caffeine showed the highest concentration of 2105 ng/L among PPCPs. It was found to be a useful indicator of recent contamination that captured a unique spatial distribution tendency. On the other hand, crotamiton, a conservative PPCP, was found to be highly diluted and might not be appropriate for tracking pollutants under heavy rainfall events. The effect of CSO discharge pattern and tidal change on the distribution of sewage markers, including dispersion degree and pollutants travel time, was described. CSO pollutants were found to accumulate in the river mouth areas during high tide before being discharged into the estuary.