Biological retention system for efficiently degrading nitrate nitrogen

Abstract

The invention provides a biological retention system for efficiently degrading nitrate nitrogen. The biological retention system is composed of a biological system and a deoxidation system, wherein the biological system comprises a submerged layer (1), a first geotechnical cloth layer (2), a sand filter layer (3), a second geotechnical cloth layer (4), a deoxidation layer (5), a third geotechnicalcloth layer (6), a denitrification layer (7), a fourth geotechnical cloth layer (8), a planting soil layer (9) and plants (10); and the deoxidation system comprises a plurality of centrifugal pumps,a check valve (18), a solar cell panel (22), a storage battery (23), an Internet-of-things water dissolved oxygen detector (19), an Internet-of-things flowmeter (15), a deoxidized resin restorer (20),a pesticide storage tank (26) and a waste liquid tank (29). The biological retention system is capable of rapidly and efficiently providing an anaerobic environment and removing nitrate nitrogen in rainwater; and meanwhile, the biological retention system is capable of guaranteeing the recycle of an anoxic layer as well as the cyclic regeneration function and economical efficiency of the system.

Description

technical field [0001] The invention relates to the technical field of rainwater treatment, in particular to a biological retention system for efficiently degrading nitrate nitrogen. Background technique [0002] The bioretention system is an emerging low-impact development in-situ runoff rainwater control system. It has good runoff pollution control effects, runoff volume reduction results, and peak flow control effects. It is economical and applicable, and can be widely used in urban greening. Improving the removal rate of nitrate nitrogen in the plant retention system is one of the difficulties in the study of urban non-point source water quality. With the effective control of point source pollution, urban non-point source pollution is becoming the main cause of urban surface water deterioration, especially the main source of urban eutrophication. [0003] At present, the bioretention system can control storm runoff and improve runoff water quality very well, but its rem...

AI Technical Summary

Problems solved by technology

However, in the case of a long interval between two rainfalls, the anoxic zone will become an aerobic zone due to water evaporation or leakage, and then lose its function of promoting denitrification; Due to the passage of time, the activity of the substances in the oxygen-removing layer decreases, and the ability to create an anoxic environment gradually decreases, thereby reducing the effect of denitrification

Therefore, in the prior art, there is no bioretention system that is efficient, simple, and recyclable for degrading nitrate nitrogen.

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