Filler for bioretention pond

Abstract

The invention discloses filler for a bioretention pond. The filler comprises the following components including a filler substrate and polyurethane biological ceramsite, the filler substrate is made by nixing cattail substrate soil and fine sand, and the polyurethane biological ceramsite comprises a hollow biological ceramsite shell and hydrophilic polyurethane foam with which the biological ceramsite shell is filled; the biological ceramsite shell is provided with an opening capable of exposing at least a portion of the hydrophilic polyurethane foam. By adding the polyurethane biological ceramsite into the filler substrate composed of the cattail substrate soil and the fine sand, the effective porosity of a filler layer is effectively increased, the percolation performance of the filler layer is improved, plugging of the filler layer is effectively prevented, the rainwater infiltration capability of the bioretention pond is improved, and the bioretention pond is less likely to be blocked.

Description

technical field [0001] The invention relates to the technical field of sponge city rainwater treatment, and more particularly, relates to a filler for a bioretention pond. Background technique [0002] Bioretention facilities are an emerging low-impact development in-situ runoff rainwater control facility. They have good runoff pollution control effects, runoff volume reduction results, and peak flow control effects. They are economical and applicable, and can be widely used in urban greening. However, due to the randomness and complexity of runoff water quality and water volume changes, the removal rate of existing bioretention facilities for pollutants in runoff rainwater fluctuates widely, and the removal effect of nitrogen and phosphorus in runoff is not ideal, and the filling soil is easy to Blockage occurs, and the infiltration effect decreases, which restricts the service life of the facility, and the soil needs to be replaced after a short period of use. It is urgen...

AI Technical Summary

Problems solved by technology

However, due to the randomness and complexity of runoff water quality and water volume changes, the existing bioretention facilities have a large fluctuation range in the removal rate of pollutants in runoff rainwater, and the removal effect of nitrogen and phosphorus in runoff is not ideal, and the filling soil is easy Blockage occurs and the infiltration effect decreases, which restricts the use time of the facility, and the soil needs to be replaced after a short period of use

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