A construction method for multi-level efficient interception and reuse of nitrogen and phosphorus pollution in farmland receding water

Abstract

The invention relates to a construction method for multi-level high-efficiency interception and reuse of nitrogen and phosphorus pollution in farmland dewatering, and relates to the field of agricultural environmental protection. Through the three-level efficient interception and reuse facilities, the efficient interception and reuse of nitrogen and phosphorus pollution in farmland receding water is realized. The first level is the purification facility of aquatic plants coupled with benthic animals ecological pools, and the construction of aquatic plant roots and benthic animals can accelerate the degradation of nitrogen and phosphorus pollutants in the sediment. The second level is a multi-level enhanced microbial denitrification and phosphorus removal facility, which forms short-range nitrification and denitrification and has simultaneous nitrification and denitrification. The third-level interception is a new type of biochar-based nitrogen and phosphorus interception and reuse facility, which realizes simple pretreatment and high-efficiency layered adsorption, and adsorbs saturated composite biochar fillers as carbon-based fertilizers to reuse farmland to achieve full-chain recycling. The invention combines multi-level high-efficiency interception and nutrient reuse, which can effectively relieve the environmental pressure of agricultural non-point source pollution, and finally achieves a substantial reduction in the loss of nitrogen and phosphorus from farmland dewatering, and at the same time realizes the utilization of waste as a resource.

Description

technical field [0001] The invention belongs to the technical field of agricultural environmental protection, and in particular relates to a construction method for multi-level efficient interception and reuse of nitrogen and phosphorus pollution in farmland receding water. Background technique [0002] In recent years, with the accelerated development of urbanization in my country, water environment problems caused by agricultural non-point source pollution, such as the use of chemical fertilizers and pesticides, have exploded. Among them, nitrogen, phosphorus and other substances are the main pollutants in non-point source pollution wastewater. , is also the main cause of water quality degradation and ecosystem degradation. According to the survey results of the degree of eutrophication of 67 lakes in my country, about 56% of the lakes are in the level of mesotrophic and medium-1 eutrophication, 15% are in the state of eutrophication, and about 9% are in the state of heavy ...

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Problems solved by technology

[0003] In view of the problems existing in the prior art, the purpose of the design of the present invention is to provide a construction method for multi-stage efficient interception and reuse of nitrogen and phosphorus pollution in farmland water withdrawal, so as to solve the problem of agricultural non-point source pollution that cannot be achieved in the prior art. It is economical, efficient, and easy to operate. This technology is suitable for the engineering application of farmland dewatering treatment in agricultural parks with a catchment area of ​​no less than 300 mu or the improvement of existing projects.

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