Rainwater bio-retention pond structure with submerging layers and method for constructing rainwater bio-retention pond structure

Abstract

The invention provides a rainwater bio-retention pond structure with submerging layers and a method for constructing the rainwater bio-retention pond structure. The rainwater bio-retention pond structure is mainly applied to reducing rainwater runoff flood peaks and managing non-point source pollution due to rainwater runoff and particularly can be applied to purifying urban and rural input type non-point source pollution. The rainwater bio-retention pond structure which is a bio-retention pond sequentially comprises a retention layer, a filter layer, a transition layer and a drain layer. Theretention layer, the filter layer, the transition layer and the drain layer are sequentially constructed from bottom to top; the retention layer is used for storing rainwater, and the transition layer, the filter layer and the drain layer are filled with medium raw materials. The rainwater bio-retention pond structure and the method have the advantages that the transition layer and the drain layerare used as the submerging layers, accordingly, the rainwater can be effectively stored, anaerobic environments can be provided, and the pollutant removal capacity can be enhanced; fillers of the various layers in the pond have interior relations, and definite particle size distribution requirements are applied to the fillers; plant growth fertilizers, adsorption granules, slow-release carbon sources and compound microbial preparations or compound microbial embedded granules are mixed with the various layers in the pond, accordingly, pollution substances in the rainwater can be assuredly efficiently treated by the bio-retention pond for a long term, and obvious nitrogen and phosphorus removal effects can be particularly realized.

Description

technical field [0001] The invention relates to the technical field of water environment treatment, in particular to a method that can effectively reduce the peak value and volume of rainwater runoff, and effectively remove solid suspended matter, nitrogen, phosphorus and other nutrients, heavy metals, pathogenic bacteria, and hydrocarbons contained in runoff pollution. The invention relates to a rainwater bioretention pond for filtering facilities of some trace organic pollutants, specifically a structure and a construction method of a rainwater bioretention pond with a submerged layer. Background technique [0002] Most of the rainwater bioretention ponds implemented at this stage use soil or sandy soil mixture to plant plants, and treat the rainwater that naturally infiltrates in the pond through the plant root system. Generally, an open design is adopted, that is, the rainwater is collected through the surface of the pond and naturally falls into the pond. penetrate into...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the traditional rainwater bioretention pond is an open bioretention system, which often occurs internal blockage, cannot store water sources, makes it difficult for plants to grow in dry seasons, and has poor pollutant treatment effects. Rainwater bioretention tank structure and construction method

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