Integrated initial rainwater graded biological filtration and retention system

Abstract

The invention discloses an integrated initial rainwater graded biological filtration and retention system. The system comprises a retention tank with an open top end used for rainwater to be subjectedto filtration and purification treatment to flow into, wherein a water storage layer, a first gravel layer used for intercepting large particles and fine particles contained in the rainwater stored in the water storage layer, a biological filtration medium layer used for intercepting large particles and fine particles which remain in the rainwater intercepted by the first gravel layer again and conducting adsorption and degradation on organic pollutants contained in the rainwater at the same time, and a second gravel layer used for fast draining the rainwater treated by the biological filtration medium layer are arranged in the retention tank from top to bottom in sequence, pervious pipes used for making the intercepted rainwater which infiltrates flow together for drainage are arranged in the second gravel layer in a buried mode, and the pervious pipes are communicated with a drainage inspection well or a receiving water body. The porosity of both the first gravel layer and the second gravel layer is larger than that of the biological filtration medium layer.

Description

technical field [0001] The invention relates to the field of sponge city construction and low-impact development, in particular to an integrated primary rainwater classification biological filtration and retention system. Background technique [0002] At present, the traditional urban rainwater "quick drainage" model is no longer suitable for the coordinated development of the economy, society and environment, and a new "sponge city construction" model has emerged as the times require. "Sponge city construction" gives priority to the use of natural drainage systems, builds ecological drainage facilities, and gives full play to the absorption, infiltration, retention, storage and purification of rainwater by urban green spaces, roads, and water systems, so that the hydrological characteristics of the city after development and construction are close to development. To effectively alleviate urban waterlogging, reduce urban runoff pollution load, protect and improve urban ecolo...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an integrated primary rainwater graded biological filtration and retention system to solve the problem that the biological filtration medium layer in the existing conventional low-impact development facilities first reaches filtration saturation, which leads to rapid growth of water head loss and easy formation of water and medium layers. The loss of microorganisms and nutrients in the medium, easy to pollute the downstream water body, greatly shorten the retention period of the filter, the rapid decline of the biological filter effect and the frequent update of the filter material

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