Treatment method for heavy metal waste residue and soil mixed pollution medium

Abstract

The invention discloses a treatment method for a heavy metal waste residue and soil mixed pollution medium. The treatment method comprises the following steps of 1, feeding and pretreating a pollution medium or a muck mixture, 2, drum-type scrubbing, 3, dewatering and grading, 4, slurry filter pressing, and 5, leacheate treatment. Compared with the prior art, the method has the following advantages that different particle size ranges are screened out, soil with different particle sizes is treated, the use amount of an eluting agent can be reduced, the soil treatment efficiency is improved, and the eluent can be directly recycled after being treated; and chromium-containing particles and stones are distinguished.

Description

【Technical field】 [0001] The invention relates to the technical field of environmental protection, in particular to a treatment method for heavy metal waste slag and soil mixed pollution medium. 【Background technique】 [0002] High-concentration polluted media mainly include polluted construction waste, high-concentration polluted soil, polluted slag-soil mixture, etc. At present, high-pressure water washing is mainly used for construction waste treatment; leaching and reduction stabilization are used for contaminated soil and muck mixture. But, existing technological method has following defect: [0003] (1) Existing high-pressure water flushing of craft construction waste can only target construction waste with contaminated surfaces, and cannot meet the standard for pollution infiltrated into the interior of construction waste; [0004] (2) The leaching of the existing contaminated soil and slag-soil mixture mainly considers the leaching effect of small-sized soil. For t...

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Problems solved by technology

[0003] (1) Existing process construction waste high-pressure water flushing can only be used for construction waste with contaminated surface, and cannot meet the standard for the pollution infiltrated into the interior of construction waste;

[0004] (2) The leaching of the existing contaminated soil and slag-soil mixture mainly considers the leaching effect of soil with small particle size. For the case of large particles mixed with waste slag, it will generally be crushed and reprocessed, and clean stones will also be treated. Crushing and processing together increases the follow-up processing cost and equipment scale;

[0005] (3) The existing treatment technology generally only targets a single polluted medium, and does not consider the function of using a system to deal with multiple media;

[0006] (4) The existing treatment technology leaching is to determine the type of eluent first, and then design the eluent treatment and reuse system, which is not suitable for switching treatment of various eluents