Sponge city rainwater recycling and purifying method

By using an automatic reversing valve driven by a temperature-sensitive phase change material and a gradient purification unit, combined with modified zeolite storage, efficient self-flowing purification of rainwater in sponge cities is achieved. This solves the problems of high cost and unstable water quality in sponge city rainwater harvesting devices, reduces the need for land occupation and manual operation, and is suitable for integration with urban ecological landscapes.

CN122403645APending Publication Date: 2026-07-17CHINA RAILWAY 15TH BUREAU GROUP CORPORATION LIMITED +1
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Patent Information

Application Number
CN202610875381.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-17
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing sponge city rainwater harvesting devices are costly, and water quality stability depends on manual operation, making them difficult to promote in urban areas with limited land.

Method used

The system uses a temperature-sensitive phase change material to drive a reversing valve that automatically switches the collection paths for initial and later-stage rainwater. Combined with a gradient purification unit in a linear treatment ditch and modified zeolite storage for purified water, it achieves self-flowing purification of rainwater.

Benefits of technology

It reduces the cost of rainwater harvesting and treatment, ensures stable water quality, requires a small footprint, integrates into the urban ecological landscape, and reduces reliance on specialized equipment and chemicals.

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Abstract

The invention relates to a sponge city rainwater recycling and purifying method, and belongs to the field of rainwater recycling and purifying treatment.The sponge city rainwater recycling and purifying method comprises the steps that a reversing valve is arranged on a rainwater flowing path, and two water outlets of the reversing valve communicate with a sewage pipe network and a collecting pipe network correspondingly; a linear treatment ditch is arranged at the tail end of the collection pipe network, so that sewage flowing out of the tail end of the collection pipe network flows in the linear treatment ditch, and a gradient purification unit is arranged in the linear treatment ditch to purify the sewage; a water storage space is arranged underground. The sponge city rainwater recycling and purifying method has the advantages that gravity is used for guiding rainwater to flow automatically, rainwater is recycled and purified in the rainwater flowing process, rainwater recycling and purifying do not consume electricity, professional equipment and drugs do not need to be purchased, treatment personnel do not need to be allocated, the cost is greatly reduced, and the method is suitable for popularization and application. And moreover, the occupied area for recycling and purifying the rainwater is small, and the rainwater is perfectly integrated into the urban ecological landscape.
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