Biological detention pond for improving ability of nitrogen and phosphorus removal

Abstract

The invention provides a biological detention pond for improving the ability of nitrogen and phosphorus removal. The biological detention pond includes a water reserve and a detention pond body structure arranged on the lower part of the water reserve, the detention pond body structure includes a planting soil layer, a packing area and a pebble bed from top to bottom, wherein the packing area is internally provided with a plurality of layers of impermeable geotechnical cloths, the detention pond body structure is divided into a plurality of layers of corridors, one ends of the impermeable geotechnical cloths are connected to the inner wall of the detention pond body structure, the other ends of the impermeable geotechnical cloths are free ends, a serpentine water seepage passageway is formed among the multiple layers of corridors, and the multiple layers of corridors are filled with different fillers correspondingly; and the pebble bed communicates with the water seepage passageway, and a perforated drainage pipe is arranged in the pebble bed. According to the biological detention pond for improving the ability of nitrogen and phosphorus removal, through design of the multiple layers of corridors, the hydraulic retention time of rainwater in the detention pond can be increased, phosphorus removal is facilitated, entering of oxygen can be isolated, an anoxic zone and an anaerobic zone are arranged on the lower part of the biological detention pond, and nitrogen removal is facilitated.

Description

technical field [0001] The invention relates to the technical field of rainwater treatment, in particular to a bioretention pond for improving the ability of nitrogen and phosphorus removal. Background technique [0002] With the country vigorously developing the construction of sewage treatment plants, point source pollution in cities has been effectively controlled. Compared with point source pollution, an important reason for water eutrophication is that rainwater carrying a large amount of pollutants cannot be obtained. Purification is discharged directly into natural water bodies. Since the 1950s, the eutrophication of receiving water bodies such as rivers and lakes has become a major environmental problem faced by all countries. With the development of urbanization, more and more nitrogen, phosphorus and other pollutants are carried in rainwater, which is harmful to the water environment. The damage is getting worse. The aggravation of urban waterlogging caused by he...

AI Technical Summary

Problems solved by technology

The existing structure has an unstable removal effect on nitrogen and phosphorus, and the removal efficiency is low, and improving the packing will increase the cost, which is not advisable in actual engineering

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