A combined remediation system for as and vocs groundwater composite pollution

By combining a multi-stage treatment system with bio-permeable reactive barriers, aeration wells, and photocatalysis, the problem of low remediation efficiency for groundwater contaminated with arsenic and volatile organic compounds has been solved, achieving efficient and energy-saving pollutant removal.

CN120920490BActive Publication Date: 2026-07-24WUHAN SURVEYING GEOTECHN RES INST OF MCC
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Patent Information

Application Number
CN202511172744.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-08-21
Publication Date
2026-07-24
Estimated Expiration
2045-08-21

AI Technical Summary

Technical Problem

Existing technologies have low remediation efficiency when treating groundwater contaminated with arsenic (As) and volatile organic compounds (VOCs). The groundwater lacks oxygen and light sources, resulting in insufficient microbial activity and an inability to effectively remove the combined pollutants.

Method used

The system employs a bio-permeable reactive barrier (PRB) combined with aeration wells and photocatalysis technology. Oxygen is provided through an aeration system, microbial nutrient solution is supplied to the microbial community through a microbial nutrient injection pipe, and a photocatalytic activated carbon purification device further treats VOCs, forming a multi-stage treatment system.

Benefits of technology

It improves the degradation rate of complex pollutants, enhances microbial activity, increases pollutant removal efficiency, reduces energy and material consumption, and achieves efficient treatment of complex pollutants.

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Abstract

The application provides a combined remediation system for As and VOCs groundwater composite pollution. The remediation system comprises a "concave" concrete retaining wall, an aeration system and a gas phase extraction system. The two sides of the concrete retaining wall are outwardly opened, a plurality of aeration wells are distributed in the horizontal retaining wall of the concrete retaining wall, and microbial nutrient liquid injection pipes are distributed on both sides of each aeration well. The aeration system comprises an air compressor arranged on the ground and a plurality of micro-nano aeration heads arranged in each aeration well. The gas phase extraction system comprises a first vacuum pump arranged on the ground and a gas phase extraction outer pipe arranged in each aeration well. The gas phase extraction outer pipe is sleeved outside the plurality of micro-nano aeration heads. The aeration well is provided with an aeration inner pipe and an extraction outer pipe. Aeration makes the dissolved toluene in the groundwater exchange with air, aeration strengthens the microbial activity, and promotes the degradation of As and toluene.
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