Chromium-contaminated soil different-position leaching repairing technology and device

A chromium-contaminated soil and leaching technology, applied in the field of contaminated soil remediation, can solve problems such as soil chromium pollution, high chromium toxicity and carcinogenicity, and achieve the effects of reducing the content of heavy metals, increasing the collision probability and strength, and saving costs

Active Publication Date: 2015-11-18
SAFECLEEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its high toxicity and carcinogenicity, chromium pollution in soil has become the most serious environmental problem

Method used

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  • Chromium-contaminated soil different-position leaching repairing technology and device
  • Chromium-contaminated soil different-position leaching repairing technology and device
  • Chromium-contaminated soil different-position leaching repairing technology and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The contaminated soil was taken from the abandoned site of a chemical plant, with a moisture content of about 25%. The above-mentioned chromium-contaminated soil ectopic leaching and repairing device was used for leaching and repairing, including the following steps:

[0047] (1) First-level leaching: After adding water to the contaminated soil, it is made into a slurry with a solid concentration of 500g / L in the pulper, and then pumped to the mixing and homogenizing equipment, and at the same time added to the mixing and homogenizing equipment 60g / kg soil leaching agent ferrous sulfate (FeSO 4 ), turn on the mixing and homogenizing equipment for the first rinsing, the rinsing time is 40min, after the rinsing is over, the slurry is pumped to the first-level vibrating screen for screening and rinsed with a certain amount of flushing water, the screen surface is in the motor Under the action of the generated exciting force, it moves longitudinally, and the large-grained m...

Embodiment 2

[0052] The contaminated soil was taken from the abandoned site of the electroplating workshop of a machinery factory, with a moisture content of about 30%. The above-mentioned chromium-contaminated soil ectopic leaching and repairing device was used for leaching and repairing, including the following steps:

[0053] (1) Primary leaching: After adding water to the contaminated soil, it is made into a slurry with a solid concentration of 600g / L in the pulper, and then pumped to the mixing and homogenizing equipment, and at the same time added to the mixing and homogenizing equipment 40g / kg soil leaching agent ferrous sulfate (FeSO 4 ), turn on the mixing and homogenizing equipment for the first rinsing, the rinsing time is 30min, after the rinsing, the slurry is pumped to the first-level vibrating screen for screening and rinsed with a certain amount of flushing water, the screen surface is in the motor Under the action of the generated exciting force, it moves longitudinally, a...

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Abstract

The invention belongs to the technical field of contaminated soil repairing treatment, and particularly relates to a heavy metal (chromium VI)-contaminated soil different-position chemical leaching repairing technology and device. The chromium-contaminated soil different-position leaching repairing device comprises a one-level scrubbing unit, a two-level scrubbing unit, a waste liquid treatment unit and a medicament adding unit. The one-level scrubbing unit comprises a pulper, an even mixing and homogenizing device, a one-level vibration screen and a one-level cyclone. The two-level scrubbing unit comprises a strong stirrer, a two-level cyclone and a two-level vibration screen. The waste liquid treatment unit comprises a thickener, a to-be-pressed mud tank and a plate-and-frame filter press. The medicament adding unit comprises a medicament tank. The chromium contaminated soil different-position leaching repairing technology comprises one-level leaching, two-level leaching and waste liquid treatment. The different-position leaching repairing technology can be flexibly adjusted according to the situation of soil or bottom mud containing various pollutants. The different-position leaching repairing technology device can be moved to a next project site to be used again after the project is over, and therefore the equipment utilization rate can be increased, and cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of remediation and treatment of polluted soil, and in particular relates to an ex-situ chemical leaching repair process and a device thereof for heavy metal (hexavalent chromium) polluted soil. Background technique [0002] Cr pollution mainly comes from wastewater and waste residues in electroplating, tanning, chemical and metallurgical industries. Cr is mainly Cr 3+ and Cr 6+ There are two valence states, Cr 3+ Low toxicity, not easily soluble in water, is an essential trace element for human and animal growth; Cr 6+ more toxic than Cr 3+ It is hundreds of times higher, easily enters human cells, causes damage to liver, kidney and other internal organs and DNA, is carcinogenic and may induce gene mutation, and is a hazardous industrial waste that is harmful to the human body. In addition, Cr 6+ It is easily soluble in water and has high mobility. In soil, horizontal migration will expand the scope of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 郑好陈益人付磊张民崔健张峻清薛强
Owner SAFECLEEN TECH
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