A multi-stage collaborative leaching remediation system for composite contaminated soil

The multi-stage synergistic leaching remediation system for composite contaminated soil, which combines graded screening and multi-stage leaching, has solved the problem of poor treatment effect of soil contaminated with heavy metals and organic matter, and achieved efficient, low-cost and environmentally friendly soil remediation.

CN122644374APending Publication Date: 2026-08-28北京首科兴业工程技术有限公司
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Patent Information

Application Number
CN202610977225.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-07-02
Publication Date
2026-08-28

AI Technical Summary

Technical Problem

Existing leaching technologies are difficult to effectively treat soils contaminated with both heavy metals and organic matter simultaneously. Furthermore, soils of different particle sizes exhibit significant differences in their adsorption characteristics for pollutants, resulting in poor treatment outcomes. The leaching solution is also costly to treat and carries the risk of secondary pollution.

Method used

A multi-stage synergistic leaching remediation system for contaminated soil is adopted, which includes a grading and screening device, a multi-stage leaching device, a compound leaching agent adjustment device, and a leaching liquid circulation and regeneration device. Through the linkage of grading and screening and leaching, combined with the precise matching and circulation and regeneration of various leaching agents, targeted treatment can be achieved.

Benefits of technology

It improves pollutant removal efficiency, reduces leaching agent consumption and wastewater treatment costs, reduces the risk of secondary pollution, and is highly adaptable to the remediation of different types of compoundly polluted soils.

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Abstract

The application discloses a kind of composite contaminated soil multistage collaborative leaching repair systems, belong to soil repair technical field.The device includes: feed device, for transporting contaminated soil and carrying out preliminary crushing;Classification screening device, at least three screening equipment is included, and soil is divided into coarse particle, medium particle, fine particle three according to particle size;Multi-stage leaching device, particle size-pollutant-leaching agent three precision matching mechanism, first establish the quantitative correlation model of " particle size-pollutant (heavy metal) form-leaching agent formula", realize accurate target cleaning.Compound leaching agent adjusting device, including a variety of leaching agent storage unit, detection unit and adjusting unit, real-time monitoring and adjusting the type, concentration and pH of leaching agent;Leaching solution recycling device, including flocculation precipitation unit, oxidation regeneration unit and concentration adjusting unit, leaching solution regeneration-circulation four-stage advanced treatment technology, first " flocculation-high level oxidation-concentration regeneration " three-stage regeneration process, break leaching solution secondary pollution bottleneck.The application can solve the two major pain points of the industry at present, and the removal efficiency of fine particle pollution is low, and the special strong chelation-reducing agent leaching unit is aimed at high adsorptive soil;High repair cost / secondary pollution, leaching solution deep regeneration and near-zero discharge recycling.
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