Ecological ditch system and method for intercepting agricultural non-point source pollution by utilizing waste aquaculture pond

Abstract

The invention discloses an ecological ditch system and method for intercepting agricultural non-point source pollution by utilizing a waste aquaculture pond, comprising the following steps: the wasteaquaculture pond is changed into an ecological pond which comprises an aerobic pond, a facultative pond and an anaerobic pond, and an intercepting layer intercepting structure is arranged in a longitudinal ecological ditch, wherein emergent aquatic plants, floating-leaved plants, submerged plants and benthic animals are arranged in the ecological pond; the longitudinal interception ditch is provided with an interception layer interception structure, microorganisms in a biological filler matrix in the interception layer interception structure can slowly enter a water body, various pollutants inthe whole interception process are subjected to physical processes such as matrix adsorption, filtration and precipitation and biochemical processes such as microorganism conversion and oxygenolysis,and finally agricultural non-point source pollutants in the water body are intercepted. The method can effectively slow down the flow rate of sewage in the ditch, prolong the hydraulic retention timeof the sewage in the ecological ditch, and improve the nitrogen and phosphorus removal rate in agricultural non-point source pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an ecological ditch system and method for intercepting agricultural non-point source pollution by using abandoned aquaculture ponds. Background technique [0002] Nitrogen and phosphorus are the fundamental elements of agricultural development, and also the main factors causing eutrophication of rivers. Although the excessive input of nitrogen and phosphorus fertilizers in farmland is currently reduced, due to the hardening of ditches in the field or the interception functions of farmland buffer zones and ecological ditches, etc. However, there is still loss of nitrogen and phosphorus in farmland, and the outflow of nitrogen and phosphorus is discharged into the surface water system, thereby aggravating the eutrophication process of rivers, lakes and even groundwater. Farmland buffer zones, ditches and ponds are important components of farmland ecosys...

AI Technical Summary

Problems solved by technology

[0003] At present, with the development of modern agriculture, the soil ditches are overgrown with weeds and the water flow is not smooth. Some soil ditches have been transformed into "three-sided light" hardened ditches, resulting in too fast water flow in the ditches without buffer time. At the same time, the hardened ditches lack Plants, sediment and microorganisms cannot absorb and degrade nitrogen and phosphorus in farmland tail water, resulting in the loss of the function of ditches to intercept and purify nitrogen and phosphorus in farmland tail water

The lack of interception ditch or pond system and buffer zone in the process of ditch runoff in the farmland system makes the nitrogen and phosphorus in the ditch runoff not fully intercepted and purified, and directly flows out of the farmland system into the surface water body, resulting in an increase in the load of nitrogen and phosphorus loss in the farmland system. Important Causes of Water Body Eutrophication in River Network Area

Images