城市尾水补给地表河流对污染物影响的研究

The study of pollutants concentration influenced by city tail sewage recharge surface river

本研究利用综合水质标识指数评价方法,对京津地区典型北运河段和污水厂出水主要水质指标进行评价研究,目的是明确两者之间的水质差异,为探索适合该地区污水厂出水深度净化并回用于地表水经济有效的技术系统提供理论依据。水质指标研究结果表明：所调查的污水厂与北运河各采样点相比：总磷（TN）含量较低;总氮（TN）含量较高;污水厂出水同时存在铵态氮（NH4-N）和硝态氮（NO3-N）两种形态氮素,且不同的取样期所占比例不同;污水厂出水COD含量相对较低,基本可达地表Ⅳ类水质类别。应用综合水质标识指数评价结果表明：污水厂出水的综合水质级别各取样期都到达了V类水级别,其余各点位于V~Ⅶ类之间;污水厂出水综合水质级别与天津段北运河监测点相比高1级水质级别,比北京段北运河高2级水质级别。因此该研究表明：所调查京津地区污水厂的出水水质总体优于受纳地表河流水质,污水厂出水总氮依然是重点控制物质,同时在进行污水厂出水深度脱氮处理时要考虑不同时期氮素的形态和含量。

Based on comprehensive water quality identification index, taking Beijing and Tianjin North canal and effluent from several sewage plants as study objects. Study water quality difference between North canal and effluent from several sewage plants, aim at exploring economic and efficient advanced treatment technology and providing theory. Water samples were analyzed for four various chemical characters during wet and dry season. The results water quality index showed that： Total phosphorus from effluent sewage plants was lower than other water samples, but total nitrogen was higher than other water samples, effluent from several sewage plants coexist ammonium nitrogen and nitrate nitrogen, and concentration was different during different sampling season; COD content were superior to class IV ;Comprehensive water quality identification index showed that effluent from several sewage plants were superior to class IV, other samples were inferior class V, and higher class 1 than Tianjing North canal and II ttlan Tianjing North canal. The study indicated that water quality of Tianjin North canal was superior than Beijing North canal; water quality from effluent sewage plants in jing-jin area was superior than North canal water quality. And total nitrogen is the key substance need to control strictly, at the same need to consider the nitrogen forms and concentration.