Application of ecological purification of farmland drainage based on zero-discharge model
基于“零排放”模式的蔬菜种植尾水生态净化应用

摘要

为探讨蔬菜种植尾水“零排放”循环利用在农田面源污染控制中的应用效果及其应用前景，对上海市某蔬菜种植尾水净化后“零排放”循环利用进行了设计，实施了新型生态拦截沟和氧化塘改造，新建了人工湿地，并对项目运行水质净化效果、生态变化等进行了跟踪监测分析。结果表明，尾水经过生态净化后，系统对SS、NH3-N和TP等污染物具有较好的去除效果，出水SS满足《农田灌溉水质标准》要求，NH3-N、TP等指标基本满足《地表水环境质量标准》Ⅴ类水标准要求；在非大雨情况下，可实现净化后的尾水全部循环利用，不对周边河道产生污染，极大的提升了河道水质稳定达标能力。该生态净化+循环利用系统具有良好的环境、经济效益和可推广性，可为农田面源污染控制提供案例参考。

Abstract

In order to discuss the application effect and prospect of zero-discharge recycling model used for non-point source pollution control, a zero-discharge project of farmland drainage was designed in Shanghai. A new type of ecological ditch, oxidation pond and artificial wetland were constructed. Monitoring and analyzing of the water purification effect and ecological change were carried out based on the project. The results showed that after the ecological purification, it has a good removal effect on pollutants such as NH3-N, SS and TP. The SS of effluent meets the requirements of the standard for irrigation water quality, and the NH3-N, TP meet the requirements of class V water standard in environmental quality standard for surface water. Usually, the purified farmland drainage can be totally recycled, which will not pollute the nearby river and improve the water quality of the river. The ecological purification and recycling system have good environmental, economic benefits and scalability, it can provide a case for non-point source pollution control.