铁岭市莲花湖湿地生态系统对城区污水中氮、磷的去除效果分析

铁岭市位于辽宁省北部，主城区人口约40万人，城区污水排放量约14万m2／d，由城市排水管网收集后入污水处理厂集中处理。城区污水处理厂出水首先排入莲花湖湿地，经湿地生态系统净化后入凡河Ⅳ类水域，最终入辽河V类水域。利用人工湿地净化铁岭城市污水，对治理辽河水流域污染具有重要意义。本文根据城市污水在莲花湖人工湿地的走向以及莲花湖人工湿地的单元构成，对湿地主要构建单元的水质进行监测，分析莲花湖人工湿地净化城市污水中氮、磷污染物的净化效果，探求城市生态环境可持续发展的新思路。

Analysis on Wastewater Nitrogen and Phosphorus Removal Efficiency in Urban Wetland Ecosystem about Tieling City Lotus Lake

Tieling City is located in the northern part of Liaoning Province, with a population of about 400,000 in the main city. The urban sewage amount is about 140 000 m3/d and was collected by the urban drainage network into the centralized treat- ment system. The effluent from urban sewage treatment plant was firstly discharged into the wetlands of Lotus Lake to be purified by the wetland ecosystem, then enter the River IV class waters, and ultimately into the Liaohe V class waters. Using constructed wetland to purify urban sewage in Tieling is of great significance to the governance of the pollution of Liaohe River Basin. Accord- ing to the scale and structure of Lotus Lake artificial wetland, this paper monitored the water quality and analyzed the nitrogen and phosphorus purification effect so as to explore the sustainable development of urban ecological environment.