Farmland recession treatment system and method based on ecological interception and cyclic purification

Abstract

The invention discloses a farmland recession treatment system and method based on ecological interception and circulating purification. The system comprises a caisson, an ecological ditch, a multi-stage ecological regulation and storage pond, an automatic water quality detection system and an intelligent water-saving irrigation system, the promoting caisson is arranged at a water outlet of the farmland, and farmland recession water discharged from the water outlet can completely enter the promoting caisson for preliminary sedimentation; the multi-stage ecological regulation and storage pond comprises a divergent section and a main reaction section which are communicated with each other; the main reaction section comprises an aeration tank, a sedimentation tank with ecological protection slopes on peripheral slopes, a first filter material dam, a second filter material dam and a purification tank; a plurality of bionic aquatic plants hung in the direction perpendicular to the water flow direction are uniformly fixed in the purification tank; and an automatic water quality detection system for detecting the standard reaching condition of water quality is arranged at the water outlet end of the purification tank. The method is suitable for intercepting farmland non-point source pollutants in planting areas of aquatic plants such as rice fields and zizania aquatica, and the river entering amount of the farmland non-point source pollutants can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of farmland non-point source water pollution treatment, and in particular relates to a farmland return water treatment system and method based on ecological interception and circular purification. Background technique [0002] The Yangtze River Delta has a well-developed water system and a dense river network. It is an important rice production base in my country. In recent years, with the vigorous promotion of measures such as soil testing formula and double reduction of fertilizer and medicine, the annual amount of chemical fertilizer application in the Yangtze River Delta has gradually achieved negative growth, but the base of chemical fertilizer application is still huge, and the utilization rate is low. The accompanying nitrogen and phosphorus The issue of churn still cannot be ignored. [0003] Studies have shown that farmland non-point source pollution mainly enters receiving water bodies in the form of surfac...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the amount of pollutants in the existing farmland dewatering water is large, and it is easy to cause pollution when it is directly discharged into the receiving water body. The water treatment system and its method enable it to effectively intercept the nitrogen and phosphorus nutrients in the receding water of farmland, and realize the recycling of nitrogen, phosphorus and water resources, so as to realize the sustainable and green development of agriculture

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