Backwash combination type farmland non-point source pollution cut-off purification system

Abstract

The invention discloses a backwash combination type farmland non-point source pollution cut-off purification system. Emergent aquatic plants and algae are arranged in gradient by virtue of structures such as guide downflow weir, backwash vertical filler, ecological settling pit which are constructed by using a part of canal (creek) beds, so that a physical-plant-microorganism ternary stereo purification system is formed, the hydraulic power condition in the canal (creek) can be greatly improved, the hydraulic power staying time can be prolonged, and the farmland non-point source pollutant can be effectively blocked and settled and finally decomposed and purified in the ecological settling pit in the synergic action of organisms; the backwash vertical filler is reversely placed regularly to automatically remove clogging, and the blocking effect can be in effect continuously, so that manual management operation can be reduced; and the purification system does not influence flood discharge of the canals (creeks) under a condition of heavy rain run-off or flood stage. The cut-off purification systems can be used in a mode of serial connection according to particular terrain and topography, so that the water body can be purified in multiple stages.

Description

technical field [0001] The invention relates to the field of riverside water environment treatment and ecological restoration, in particular to a combined physical-biological ecological farmland surface suitable for ditches (riversides) that are heavily polluted by farmland non-point sources and have backwashing functions under normal water levels. Source pollution interception purification system. Background technique [0002] In recent years, agricultural non-point source pollution has become a major water environment problem in my country. Excessive application of chemical fertilizers has led to a large loss of nutrients such as nitrogen and phosphorus, resulting in eutrophication of lakes and other water bodies, making them lose their use value for production and life. And may cause groundwater pollution and even food contamination. The pollution load of agricultural non-point sources COD, N, and P has accounted for 1 / 2 to 2 / 3 of the water pollution load. According to r...

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Problems solved by technology

[0004] The purpose of the present invention is to address the above-mentioned defects of the prior art, to provide a combined physical-biological ecological farmland non-point source pollution interception and purification system that is applicable to water level changes and can be backwashed. ) bed to construct structures such as diversion overflow weir, backwashable vertical packing, ecological settlement pit, etc. Emerging plants and algae are arranged in gradients to form a three-dimensional three-dimensional purification system of physics-plants-microbes, which reduces manual management operations , effectively intercept the pollutants from the upstream of the ditch (river); at the same time, in the case of heavy rainfall runoff or flood level, the purification system does not affect the drainage of the ditch (river)

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