Bioretention pond with simultaneous nitrogen and phosphorus removal function

Abstract

The invention discloses a bioretention pond with a simultaneous nitrogen and phosphorus removal function. The bioretention pond comprises a super-high layer, a submerged layer, a covering layer, an iron-modified biochar packing layer, a gravel drainage layer and a water outlet which are all distributed in a bioretention pond body from top to bottom; the bioretention pond body is internally provided with an inspection well, the top of the inspection well is provided with a rainwater perforated strainer, the bottom of the inspection well is provided with an overflow water outlet, and the side wall of the inspection well is communicated with the water outlet; the height h of the super-high layer and the submerged layer in the bioretention pond body is the sum of the height a of the gravel drainage layer and 1 / 5 of the height b of the iron-modified biochar packing layer; the height of the submerged layer is 1 / 3 of the height of the iron-modified biochar packing layer; outflow water of theportion, at the height a+1 / 5b from the bottom, of the submerged layer is collected from the water outlet with the upturned bottom; rainwater beyond the height of the submerged layer is discharged outof the overflow water outlet of the inspection well from the rainwater perforated strainer. The bioretention pond has the advantages that the removal rates of the nitrogen and phosphorus in runoff rainwater by the bioretention pond are simultaneously increased, and the nitrogen and phosphorus removal effect is improved.

Description

technical field [0001] The invention relates to the technical field of rainwater treatment, in particular to a bioretention pond for efficient and simultaneous denitrification and phosphorus removal. Background technique [0002] The concept of stormwater management in various countries has its own characteristics, and the concept of LID is more in line with China's national conditions. Domestic researchers have made a lot of efforts for the application of LID in China, and proposed many LID measures suitable for domestic use to achieve the goal of stormwater management. As a typical source control LID measure, bioretention ponds are widely used around the world, and can effectively alleviate the impact of urban rainwater runoff on hydrology, water quality and water ecology. Generally, bioretention ponds have a good removal effect on some heavy metals and suspended solids, but the removal effect on N, P and other nutrients fluctuates greatly. Studies have shown that the per...

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Problems solved by technology

On the other hand, different submerged depths also have a certain influence on the removal effect of N and P

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