分流制泵站旱流放江对受纳河道水质的影响

摘要

Pumping Station Z of separate drainage system in the city proper of Shanghai has been taken as a typical example to study the effects of dry weather flow discharge on the receiving waters. It showed that as affected by dry weather flow discharge, the levels of COD, sulphides and ammonia nitrogen in the receiving waters went up 0.23% - 37.68%, 7.4% - 76.19% and 10.60% - 76.15%, respectively. The lowering of COD and ammonia nitrogen levels mainly depended on the dilution and diffusion of the waters; however, the reduction of sulphides such as hydrogen sulphide, ferrous sulphide, and etc. was mainly caused by the oxidation-reduction reaction. Moreover, the waters evidently influenced by dry weather flow discharge ranged 40 m on either upstream or downstream of the river around the discharge outlet of the pumping station, whilst water quality of the Huangpu River was unlikely to be affected.%为了探明分流制泵站旱流放江对受纳河道的影响，以上海市中心城区典型分流制系统z泵站为例，研究了旱流放江对受纳河道水质的影响。结果显示：（1）受泵站放江的影响，河道COD、硫化物以及氨氮的增幅分别为0．23％～37．68％、7．4％～76．19％、10．60％～76．15％；（2）旱流放江污染物对河道水质的影响有显著差异，其中COD与氨氮浓度的下降主要源于水体的稀释扩散作用；而H2S、FeS等硫化物浓度的降低则更多的受到氧化还原反应的影响；（3）Z泵站旱流放江对z河水质的显著影响范围为泵站排放口上下游40m范围内，对黄浦江水质的影响则总体不大。