[目的]考察污水处理厂尾水排放对地表水的影响。[方法]以苏南地区某城镇污水处理厂为例，对污水处理厂尾水、纳污河道上、下游河水水质进行了连续1年的监测分析。[结果]尾水的集中排放导致排放口河水水质各指标明显高于上、下游河水，且排放口上游河水污染物平均浓度小于下游。空间上看，随着河道的自净、稀释作用，离污水处理厂排放口越远，水质呈好转趋势。时间上看，纳污河道的 TN、TP 和 NH 4－N 指标浓度呈现出冬季高、夏秋低的特点。[结论]污水处理厂尾水排放会导致排放河道营养盐（N 和 P）浓度＋的升高，应采取相关措施减小污水处理厂尾水排放对纳污河道及区域水环境造成的影响。%Objective] To evaluate the impact of municipal sewage plant’s effluent on the receiving water body.[Method] The water quali-ties of municipal sewage plant’s effluent, upstream and downstream of the receiving river were continuously monitored for a full year.[Re-sult] The discharge of effluent could lead to the obvious increase of pollutant concentrations in river water.The water quality indicators at dis-charge outlet were significantly higher than those both in upstream and downstream of the river.And the average concentration of pollutants in the upstream water were also less than those in the downstream water.From the space level, the water quality of downstream river showed the improvement tendency with increase of the distance between discharge outlet and sampling sites, mainly due to the self -purification and dilu-tion of the water body.From the time level, water quality indicators such as TN, TP and NH 4 -N showed higher concentrations in winter,+while lower concentrations in summer and autumn.[Conclusion] The discharge of sewage plant’s effluent leads to increase of N, P concentra-tion in rivers, corresponding measures should be adopted to reduce effects of sewage plant’s effluent on receiving water environment.
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