Leaching process and device for heavy-metal-containing waste residues or soil

Abstract

The invention discloses a leaching process and device for heavy-metal-containing waste residues or soil. The leaching process comprises the steps of crushing, screening, leaching, automatic collection and guiding drainage of leaching liquid, dynamic monitoring, repeated leaching and the like. The leaching device comprises a crusher, a conveying unit, a screening machine, a leaching field, a spraying unit, at least two collection ponds, a settling pond and the like. The leaching process and device are free of limitation of equipment processing capacity, and the construction period is greatly shortened. Meanwhile, the leaching restoration process is easy to implement, the leaching liquid is automatically collected and guided to be drained, the difficulty of separating soil and water is omitted, the construction period can be greatly shortened, the cost can be greatly reduced, and the secondary pollution can be greatly avoided.

Description

technical field [0001] The invention belongs to the field of environmental restoration, and in particular relates to a washing process and device for heavy metal-containing waste residue or soil. Background technique [0002] At present, the remediation technologies for heavy metal-containing waste slag and heavy metal-contaminated soil mainly include chemical leaching method, biological remediation method, electrokinetic remediation method, safe landfill method, immobilization / stabilization method, etc. However, these methods have their own limitations: such as immobilization / stabilization method is expensive, and heavy metals cannot be removed fundamentally. The electric remediation method has strict requirements on soil conditions, expensive remediation costs, is suitable for small areas of pollution, and is not easy to operate on site. Bioremediation includes phytoremediation and microbial remediation. This technology is mainly manifested in the long disposal time, whic...

AI Technical Summary

Problems solved by technology

However, these methods have their own limitations: such as immobilization / stabilization methods are expensive, and cannot fundamentally remove heavy metals

The traditional ectopic leaching technology is to excavate the contaminated soil into the container, wash it with the eluent, so that the heavy metal pollutants in the soil are transferred to the liquid phase where the eluent is located, and then separate the mud and water from the mixture, and leaching After the pollutants in the washing liquid are disposed of, they can be used again in the washing step. If the washed soil meets the control standards, it can be backfilled or used safely. However, the treatment capacity is limited by the equipment and cannot be carried out on a large scale. Washing process, and faced with the huge problem of mud-water separation

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