Rainwater runoff treatment matrix and rainwater bioretention pond constructed by using matrix

Abstract

The invention discloses a rainwater runoff treatment matrix and a rainwater bioretention pond constructed by using the matrix. A pyrite matrix layer on the lower layer of the rainwater runoff treatment matrix comprises pyrite, shell powder and a sandy material which are mixed according to the volume ratio of 10: 5: 85; and the upper biochar matrix layer comprises biochar or activated carbon, organic nutrient soil and a sandy material which are mixed according to a volume ratio of 20: 3: 77. A gravel drainage layer, a transition layer, a pyrite matrix layer, a biochar matrix layer, a sawdust protection layer and a water storage layer are sequentially arranged in a pond body of the rainwater bioretention pond from bottom to top; a perforated water collecting pipe is installed on the gravel drainage layer and connected with a lifting water outlet pipe, and the position height of the lifting water outlet pipe is equal to the top height of the pyrite matrix layer; and an overflow pipe is mounted at the top opening of the pond body. The matrix has the technical effects that the removal rate of common pollutants in the rainwater runoff is increased, the yield of byproducts can be reduced,and the matrix is durable.

Description

technical field [0001] The invention belongs to the technical field of rainwater treatment, and in particular relates to a mixed matrix of biochar and pyrite for treating rainwater runoff and a rainwater bioretention pond constructed with the matrix. Background technique [0002] With the acceleration of urbanization and the intensification of global climate change, the impermeable area of ​​urban surfaces has increased year by year, resulting in frequent occurrence of a series of problems such as urban waterlogging and non-point source pollution in recent years. Among them, a large amount of nitrogen, phosphorus and organic matter enter the receiving water body with urban runoff, causing a series of environmental problems such as black and odorous water body and eutrophication of water body. [0003] In order to solve the above problems, many countries have proposed new stormwater management concepts and systems, such as LID (Low Impact Development) in the United States, an...

AI Technical Summary

Problems solved by technology

However, as a water-insoluble mineral, pyrite has limited electron supply ability and can only maintain a low rate of denitrification, which increases the hydraulic retention time and volume of sewage facilities, and cannot be widely used in sewage treatment.

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