感潮河段污水处理厂尾水对受纳水体的水质影响研究

摘要

感潮河段污水处理厂尾水排放对受纳水体产生一定影响,利用二维水动力水质耦合模型,以COD、NH3-N、TP为污染因子,分别以正常排放和事故排放两种条件,模拟江苏南部某污水处理厂尾水排放,分析江段大小潮时污染物浓度增量情况.实验结果表明:正常排放,尾水对排放口附近江段保护区水质影响小;事故排放,尾水对保护区水质无影响,但长江水体影响范围增大,沿岸污染物浓度增高,且小潮周期影响作用强于大潮周期,污水处理厂应加强管理,尤其在小潮时应避免污水事故排放.%The discharge of tail water from sewage treatment plant in tidal reaches has a certain impact on the receiving water. The study uses two-dimensional hydrodynamic and water quality coupling model,COD,NH3-N,TP pollution factor,respec-tively with normal discharge and discharge accident both conditions,simulation of tail water from a sewage treatment plant south of Jiangsu,analyze the pollutant concentration increment of the size of the tide. The experimental results show that the normal dis-charge of tail water of river outfall water near the small protected areas;accidental discharge,tail water has no effect on the water quality protection zone,but the Yangtze River range increases,coastal pollutant concentration increased,and the effect is stronger than the spring neap cycle period,the sewage treatment plant management should be strengthened, especially avoid sewage dis-charge accident during the neap tide.