农田面源污染全流程控制技术体系的构建及其应用

Construction and application of the whole process control technology system of farmland non-point source pollution

从农田(源头)—沟渠(过程)—水塘/湿地(末端),构建了“控制灌排—生态沟渠—仿生增氧人工湿地”农田面源污染全流程控制技术。通过控制灌排、基于基底功能强化的沟渠生态化改造、多功能仿生增氧湿地构建等单元治理技术耦合,形成了农田面源污染治理技术体系,并在南京市八卦洲街道PY农业园区进行了中试示范研究。研究结果表明:全流程耦合技术能有效降低面源排水的污染物质量浓度,示范区面源排水中主要污染物COD_(Mn)、NH_(3)-N、TN、TP质量浓度降幅均超过20%以上,实现了污染负荷的高效削减。研究结果为乡村振兴中农田面源污染的有效削减和防控提供了重要的技术支撑。

From the farmland(source),ditch(process),pond/wetland(end),the whole process control technology of farmland non point source pollution was constructed,which was described as“control irrigation and drainage ecological ditch bionic oxygenated artificial wetland”.Through coupling irrigation and drainage control,ecological transformation of ditching based on enhanced base function,construction of multi functional bionic oxygenated wetland and other unit treatment technologies,the farmland non point source pollution control technology system was formed,and a pilot study was conducted in PY Agricultural Park,Baguzhou Street,Nanjing city.The results show that the whole process coupling technology can effectively reduce the pollutant concentration in the non point source drainage,and the main pollutants in the non point source drainage in the demonstration area,permanganate index,ammonia nitrogen,total nitrogen and total phosphorus concentration,all decreased by more than 20%,realizing the efficient reduction of pollution load.The results provide important technical support for effective reduction and prevention and control of farmland non point source pollution in rural revitalization.