Ecological restoration system for agricultural non-point source polluted farmland tail water

Abstract

The invention provides an ecological restoration system for agricultural non-point source polluted farmland tail water. The system comprises a compound biological purification bed, wherein the compound biological purification bed is sequentially divided into an anaerobic section, an anoxic section and an aerobic section in the horizontal direction; the anaerobic section and the anoxic section are separated by a first partition plate provided with a water flow hole; the anoxic section and the aerobic section are separated by another first partition plate provided with a water flow hole; a height difference is formed between the water inlet and the water outlet of each of the anaerobic section, the anoxic section and the aerobic section; the anaerobic section and the aerobic section are filled with a filler for biofilm formation; the anoxic section is divided into n+1 sections by n guide plates provided with water flow holes; a height difference is formed between the water inlet and the water outlet of each section in the anoxic section; and an aeration pipe is further arranged in the aerobic section. The ecological restoration system achieves the effects of continuous purification process, adjustable biological treatment time, no need of sewage pumping, energy saving and consumption reduction. The compound biological purification bed is combined with other units to form a better ecological restoration system which is formed by sequentially connecting a grassed swale, a desilting basin, a simulated ecological ditch, a bioretention pond, the compound biological purification bed and an ecological system pond. The preferred system is more comprehensive in treatment process and higher in purification efficiency.

Description

technical field [0001] The invention relates to the technical field of agricultural sewage treatment, in particular to an ecological restoration system for agricultural non-point source polluted farmland tail water. Background technique [0002] Agricultural non-point source pollution mainly refers to various pollutants in farmland production activities, such as sediments, nutrients, pesticides, germs, etc., through runoff, leaching, and farmland drainage, etc., in the form of low concentrations and large areas from the pedosphere The process of pollution spreading to the human circle. The formation of agricultural non-point source pollution is a comprehensive and complex process, including rainfall runoff process, soil erosion process, surface solute dissolution process and soil solute seepage process. Soil, topography, rainfall, land cover, human activities and many other factors. A large amount of chemical fertilizers, pesticides and agricultural film are often invested...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an ecological restoration system for farmland tail water polluted by agricultural non-point sources. The ecological restoration system cannot effectively combine anaerobic treatment and aerobic treatment, resulting in low sewage treatment efficiency.

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