Advances in Resources and Environmental Science

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.

zero-discharge; farmland drainage; constructed wetland; recycling; non-point source pollution