Non-point source pollution abatement method for plain river network regions

Abstract

The invention discloses a non-point source pollution abatement method for riverside wetlands. The method comprises the following steps: A, selecting a riverside source which takes planting and breeding industries as pollutant sources and is smooth in water current as a pollution abatement area; B, arranging fences in the riverside pollution abatement area, setting a pollutant concentrated input area as a matrix absorptive area, and setting the other parts of a riverway as aquatic plant absorptive areas, wherein the fences are made of bamboo and wood or concrete.; C, putting straws in the matrix absorptive area, wherein the putting amount is 20-25 kg / m<2>; planting myriophyllum aquaticum in the aquatic plant absorptive areas, wherein the canopy density reaches 20-30%; and D, managing a riverside wetland system, namely, after running 4-5 months, complementing straws with a putting amount of 15-20 kg / m<2> for the matrix absorptive area, harvesting the myriophyllum aquaticum at an interval of 1-2 months, and timely repairing the damaged fences. The method disclosed by the invention is low in construction and running costs, simple to operate, and easily accepted by grass-roots departments of towns and villages and the like, and has an excellent treatment effect on nitrogen, phosphorus and chemical oxygen demands in riverside sewage, therefore, the method has a good popularization and application prospect for subtropical plain river network regions of China.

Description

technical field [0001] The invention relates to the field of agricultural environment, and more specifically relates to a treatment method for pollutants in plain river network areas from aquaculture sources, especially suitable for the treatment of water pollution in subtropical plain river network areas south of the Yangtze River in China, reducing the chemical oxygen demand (COD) of water bodies ( COD) and nitrogen and phosphorus content above 95%. Background technique [0002] In recent years, with the rapid development of large-scale aquaculture, the problem of eutrophication in rivers and lakes caused by the discharge of aquaculture waste has become increasingly prominent. Aquaculture has become an important source of agricultural non-point source pollutants nitrogen and phosphorus in my country. According to the results of the 2010 National Survey of Pollution Sources, the annual discharge of major water pollutants from agricultural sources in my country is: 13.2409 m...

AI Technical Summary

Problems solved by technology

Although the local governments of several large lakes and their surrounding areas in China have spent a lot of manpower and material resources to control eutrophication with engineering measures, they will return to the original state after 1-2 years. The overall control effect is not good. The main reason is The source of pollutants has not been effectively controlled

In the subtropical plain river network area, due to the gentle terrain and slow water flow, the problem of water eutrophication caused by planting and aquaculture is very prominent, but the problem of water pollution control has always been a difficult problem in local water environment governance

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