Heavy metal polluted underground water in-situ permeable reactive barrier repairing device and repairing method

By introducing zeolite loaded with nano-zero ferric iron and attapulgite loaded with acidic substances into a permeable reactive barrier, and combining it with a gelatin layer to form an acidic environment, the problem of poor remediation effect of antimony-contaminated groundwater in existing technologies has been solved, and a highly efficient groundwater remediation effect has been achieved.

CN122355402AActive Publication Date: 2026-07-10HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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Patent Information

Application Number
CN202610834522.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-10
Publication Date
2026-07-10
Estimated Expiration
2046-06-10

AI Technical Summary

Technical Problem

Existing permeable reactive barrier technology cannot effectively meet the needs of efficient remediation of antimony-contaminated groundwater, especially in the treatment of heavy metal pollution in antimony mining areas, and further improvements are needed.

Method used

A permeable reactive barrier remediation device for heavy metal contaminated groundwater is designed, comprising a permeation zone, a reaction zone, and a buffer zone. It utilizes zeolite loaded with nano-zero valent iron and attapulgite loaded with acidic substances. By coating the surface of the attapulgite with a gelatin layer, an acidic or weakly acidic environment is formed. Combined with the particle size design, the removal effect of antimony is enhanced.

Benefits of technology

It significantly improved the removal rate of antimony, achieving efficient in-situ remediation of groundwater, and maintained good removal performance across different pH ranges.

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Abstract

The invention discloses a heavy metal polluted underground water in-situ permeable reactive barrier repairing device and method, the heavy metal polluted underground water in-situ permeable reactive barrier repairing device comprises a permeation zone, a reaction zone and a buffer zone which are arranged in sequence, the permeation zone is provided with a permeation filler, and the buffer zone is provided with a buffer filler; a reaction filler is arranged in the reaction area, and the reaction filler at least comprises zeolite loaded with nano zero-valent iron and attapulgite loaded with an acidic material; the surface of the attapulgite is coated with a gelatin layer; the particle size of the buffer filler is smaller than that of the reaction filler, and the particle size of the reaction filler is smaller than that of the permeable filler. According to the method disclosed by the invention, the acidic substance is loaded in the attapulgite and is matched with the zeolite loaded with the nano zero-valent iron for use, so that the environment of the zeolite loaded with the nano zero-valent iron is in an acidic or weakly acidic environment, and the removal of the antimony element in the underground water by the zeolite loaded with the nano zero-valent iron is effectively enhanced; and an excellent underground water in-situ remediation effect is achieved.
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