Ecological ditch with nitrogen and phosphorus removal function

Abstract

The invention provides an ecological ditch with a nitrogen and phosphorus removal function. The ecological ditch with the nitrogen and phosphorus removal function comprises a quasi-three-smooth-side ditch body, a plurality of solid slow release carbon source packing pools and a lifting dam, wherein the solid slow release carbon source packing pools are located below the bottom of the quasi-three-smooth-side ditch body, and the lifting dam is located at the tail end of the ecological ditch in the water flow direction. On the whole, a construction method of the ecological ditch with the nitrogen and phosphorus removal function is developed by taking the problems of a traditional soil ditch and a traditional three-smooth-side cement hardened ditch into full consideration. On the basis that the normal drainage function of a farmland ditch is guaranteed, the functions of a soil adsorption part, a packing adsorption part, a plant adsorption part, a biodegradation part and other parts of the ditch are enhanced, the biological diversity of the farmland ditch is enriched, effective removal of nitrogen and phosphorus pollutants in farmland tail water is achieved, and the ditch is made to serve as a nitrogen and phosphorus pollutant treatment unit between the farmland tail water and a receiving water body.

Description

technical field [0001] The invention relates to an ecological ditch with the functions of denitrification and dephosphorization. Background technique [0002] Agricultural non-point source pollution represented by farmland tailwater is becoming more and more serious. Excessive application of nitrogen, phosphorus and chemical fertilizers in farmland and a large amount of nitrogen and phosphorus pollutants are discharged into surrounding surface water bodies along with farmland tailwater, which brings serious eutrophication hazards to receiving water bodies. [0003] Plants grow in traditional soil ditches, which have certain functions such as soil adsorption, plant absorption and biodegradation, and have certain but not very significant removal functions for nitrogen and phosphorus pollutants. However, after a period of operation, the weeds in the ditches Overgrown, serious soil erosion, poor water flow, and the removal effect of nitrogen and phosphorus pollutants cannot be f...

AI Technical Summary

Problems solved by technology

[0002] Agricultural non-point source pollution represented by farmland tailwater is becoming more and more serious. Excessive application of nitrogen, phosphorus and chemical fertilizers in farmland and a large amount of nitrogen and phosphorus pollutants are discharged into surrounding surface water bodies with farmland tailwater, which brings serious eutrophication hidden dangers to receiving water bodies.

[0003] Plants grow in traditional soil ditches, which have certain functions such as soil adsorption, plant absorption and biodegradation, and have certain but not very significant removal functions for nitrogen and phosphorus pollutants. However, after a period of operation, the weeds in the ditches Overgrown, serious soil erosion, poor water flow, and the removal effect of nitrogen and phosphorus pollutants cannot be fully guaranteed, so it still causes some pollution to subsequent receiving water bodies

At present, the three-sided cement hardened ditch often used by farmers is mainly used as a discharge channel for farmland tail water. Although the hardened ditch is easy to maintain, there are basically no plants growing in it, and the ability to remove pollutants such as nitrogen and phosphorus in farmland tail water is weak. The speed is fast, and the residence time of farmland tail water in the ditch is very short, so it is difficult to fully remove pollutants such as nitrogen and phosphorus in the farmland tail water in the ditch

It can be seen that the self-purification ability of traditional soil ditches and three-sided light cement hardened ditches to nitrogen and phosphorus pollutants in farmland tail water is weak, which makes the agricultural non-point source pollution dominated by farmland tail water become increasingly serious.

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