Method for reusing combined rainwater of permeable concrete pavements and composite substrate green belts

Abstract

The invention relates to a method for reusing combined rainwater of permeable concrete pavements and composite substrate green belts, including sequentially connected permeable concrete pavement, composite substrate green belt, water storage tank and reuse pipeline, wherein the bottom of the permeable concrete pavement is communicated with a water outlet pipe of the composite substrate green belt;the composite substrate green belt includes flooding-resistant green belt vegetation, a sandy soil layer, a quartz sand layer, a zeolite layer, a shale layer and a gravel layer from top to bottom insequence; the water outlet pipe at the bottom of the composite substrate green belt is communicated with a water storage tank; an inspection well and an overflow pipe are arranged at the upper end ofthe water storage tank; the overflow pipe is in communication with a municipal rainwater well nearby, and a reuse pump is arranged at the bottom of the water storage tank and is in communication witha reuse pipeline; and a valve and a water intake are arranged on the reuse pipeline. The method for reusing combined rainwater of permeable concrete pavements and composite substrate green belts solves the problem of urban flood control and waterlogging drainage pressure caused by pavement stagnant water during rainfall, and lack of water source for municipal maintenance and the like in dry season, provides a feasible path for absorbing pavement rainwater and realizing on-site reuse of rainwater, and is beneficial to promoting sponge city construction.

Description

technical field [0001] The invention relates to a rainwater reuse method for combining a permeable concrete pavement and a composite substrate green belt, and belongs to the field of rainwater resource utilization technology and sponge city construction. Background technique [0002] my country's water resources are scarce and distributed unevenly in time and space. With the continuous improvement of people's living standards, water consumption is also increasing, and the pressure on urban water supply is increasing. At the same time, on the one hand, with the rapid development of cities and the hardening of urban underlying surfaces, urban rainfall runoff is discharged through drainage pipes, which puts great pressure on municipal pipes, and urban waterlogging occurs from time to time. On the other hand, rainwater resources are seriously wasted and cannot be fully utilized. The proposal of the new concept of "sponge city" construction has put forward new ideas for urban ra...

AI Technical Summary

Problems solved by technology

At this time, the runoff directly flows into the drainage system or river, which will increase the load of the drainage system, cause river water pollution, and also greatly waste rainwater resources.

Permeable concrete pavement is a new type of environmentally friendly ecological road that can quickly reduce the runoff in rainy seasons, reduce the burden of urban drainage facilities and purify runoff pollution. The removal rate is only 35-75%, the purification effect is unstable, and the effluent cannot meet the reuse standard. Therefore, it is necessary to combine other bioengineering measures to strengthen the purification of rainwater runoff and realize reuse.

[0004] The patent application documents with Chinese patent application numbers 200710200117.4 and 201710523583.X respectively introduce the use of permeable concrete pavement to infiltrate and collect rainwater resources, and use the collected rainwater to water green belts and replenish water for green plant soils, which improves to a certain extent The utilization rate of rainwater is considered, but there are many pollutants in rainwater runoff, and the water purification effect of permeable concrete pavement is limited. It is difficult to meet the reuse standard of directly collected rainwater, and direct use may bring negative impacts

The patent application numbers are 201410040722.X, 201710727239.2 and the literature "Design of rainwater collection and treatment system for vertical flow-horizontal flow combined with permeable concrete pavement" and the literature "Design of rainwater collection and treatment system for permeable concrete pavement / constructed wetland" introduce permeable The combination of concrete pavement and biological retention pond or artificial wetland collects, treats and utilizes rainwater, removes the pollution in rainwater runoff, and improves the utilization rate of rainwater. However, in recent years, urbanization has developed rapidly, and urban development space is limited. Resources are scarce, and the construction of bioretention ponds and artificial wetlands around roads lacks suitable land space, and the cost is high. In addition, traditional artificial wetlands are not effective in removing pollutants such as nitrogen and phosphorus, and it is difficult to meet the rainwater reuse standard. Therefore, Applications are limited

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