分流制泵站旱天放江对受纳河道水质的影响

Effect of Dry Weather Discharge from Pumping Station with Separate Sewer System on Receiving River Water Quality

以上海市中心城区典型分流制系统Z泵站为例,研究了旱天放江对受纳河道水质的影响。结果显示:受放江负荷的影响,受纳河水的COD、硫化物及氨氮浓度增幅分别为(0.23%～37.68%)、(7.4%～76.19%)、(10.60%～76.15%);泵站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,而硫化物浓度的降低则主要受到氧化还原反应的影响;Z泵站旱天放江对河道水质的显著影响范围为泵站排放口上、下游40 m范围内,对黄浦江水质的影响不大。

The river water quality during dry weather discharge was momtored to study tiae ettect ot dry weather discharge from an example Z pumping station with separate sewer system in central Shanghai on the receiving river water. The study showed that for the effect of dry weather discharge, increases in COD, sulfide and ammonia nitrogen ranged from 0.23% to 37.68% , 7.4% to 76.19% and 10.60% to 76.15% respectively. The effects of discharged pollutants on the river water quality were different. COD and ammonia nitrogen concentration of the river mainly depended on dilution and diffusion of the water; however, the reduction of sulfides concentration was mainly caused by the oxidation-reduction reaction. The influence of dry weather discharge from Z pumping station on the river water quality was significant within 40 m upstream and downstream of the discharge outlet of the pumping station. The effect on the Huangpu River water was little overall.