System and method for controlling non-point source pollution and recycling nitrogen and phosphorus of paddy fields

Abstract

The invention discloses a system and a method for controlling non-point source pollution and recycling nitrogen and phosphorus of paddy fields, belonging to the technical field of pollution prevention. The system comprises a water collection unit, a grid filtering unit, a buffer unit, a nitrogen-phosphorus adsorption unit, a flow on-off control unit, an artificial wetland, a natural water storage facility and a water conservancy recharge unit. When water is drained from the paddy fields, water sequentially flows through each unit, phosphorus and nitrogen are adsorbed through nitrogen-phosphorus adsorption substances and are absorbed by the artificial wetland, so that the contents of nitrogen-phosphorus substances are further reduced, and the purpose of reducing the eutrophication of a water body is achieved; when the paddy fields are irrigated, water enters irrigation channels through the adsorption unit, absorbed substances nitrogen-phosphorus substances are released into irrigation water through desorption and are reused in the paddy fields. Compared with the prior art, the system and the method have the advantages that when the water body pollution is maximally controlled, the recycling of the nitrogen-phosphorus substances and the harmony between the facility and the nature are realized, and the purposes of controlling the pollution and saving the fertilizer applying cost are achieved.

Description

technical field [0001] The invention relates to a paddy field non-point source pollution control and nitrogen and phosphorus recycling system and method, belonging to the technical field of pollution prevention and control. Background technique [0002] In the vast rural areas, agricultural non-point source pollution is an important source of water environment pollution, and its main pollutants are nitrogen and phosphorus, which are the main substances that cause eutrophication of water bodies. The main sources of agricultural nitrogen and phosphorus non-point source pollution include farmland fertilization, animal excrement, and production and domestic sewage, among which farmland fertilization accounts for the largest proportion. [0003] In the process of planting crops, people use a lot of organic or inorganic chemical fertilizers rich in nitrogen and phosphorus, such as chemical fertilizers. Since the average utilization rate of nitrogen and phosphorus in crops is about...

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Problems solved by technology

[0006] The present invention aims to solve the problem of non-point source pollution of nitrogen and phosphorus in paddy fields in southern my country and provide a non-point source pollution control and nitrogen and phosphorus recycling system for paddy fields that can recycle part of the nutrients, save costs, and discharge the farmland drainage to natural water bodies. and method

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