Treatment method and treatment equipment for remedying hexavalent chromium-polluted soil

A technology of polluted soil and treatment method, which is applied in the field of treatment method and treatment equipment for repairing hexavalent chromium-contaminated soil, can solve the problems of persistent environmental danger, hereditary gene defects, not very applicable, etc., and achieve good leaching effect, The effect of low cost and convenient disassembly and assembly

Inactive Publication Date: 2017-05-31
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium is an ingestion poison/inhalation extremely poison, skin contact may cause sensitivity; it is more likely to cause hereditary gene defects, inhalation may cause cancer, and has persistent danger to the environment
Bioremediation generally includes microbial remediation and phytoremediation. It refers to the use of plants or micro

Method used

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  • Treatment method and treatment equipment for remedying hexavalent chromium-polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Taking a chromium salt factory in Gansu as an example, the above-mentioned method was used to treat low-concentration (Cr(VI) pollution concentration < 1000mg / kg) chromium-contaminated soil with ex-situ leaching. The specific process and repair effect are as follows:

[0047] After testing, the soil pH is around 7.2-8.8, and the concentration range of Cr(VI) pollution is 214.30-786.7mg / kg. For such acid-soluble Cr(VI)-containing chromium-containing slag-contaminated soil, only reduction and stabilization agents cannot be used to completely detoxify, and wet grinding must be carried out to destroy the physical structure of the slag particles, so that the acid-soluble, oxidizable state, reducible state and residue state are more fully reacted with the reducing agent after being leached by the agent.

[0048] The contaminated soil is transported to the ex-situ treatment area, and the contaminated soil enters the rod vibrating feeder to remove the gravel with a particle siz...

Embodiment 2

[0051] Taking a chromium salt factory in Gansu as an example, the above-mentioned method was used to carry out ectopic leaching treatment on medium-concentration (1000mg / kg

[0052] After testing, the soil pH is around 7.2-8.8, and the concentration range of Cr(VI) pollution is 1245.3-4866.5mg / kg. For this kind of chromium-containing slag-contaminated soil with high acid-soluble Cr(VI) content, only providing reduction and stabilization agents cannot completely detoxify, and wet grinding must be carried out to destroy the physical structure of the slag particles, so that the acid-soluble, The oxidizable state, reducible state and residue state are more fully reacted with the reducing agent after being leached by the agent.

[0053] The contaminated soil is transported to the ex-situ treatment area, and the contaminated soil enters the rod vibrating feede...

Embodiment 3

[0056] Taking a chromium salt factory in Gansu as an example, the above-mentioned method was used to treat high-concentration (Cr(VI) pollution concentration>5000mg / kg) chromium-contaminated soil with ex-situ leaching. The specific process and repair effect are as follows:

[0057] After testing, the soil pH is around 7.2-8.8, and the concentration range of Cr(VI) pollution is 6734.70-17883.2 mg / kg. For this kind of chromium-containing slag-contaminated soil with high acid-soluble Cr(VI) content, only providing reduction and stabilization agents cannot completely detoxify, and wet grinding must be carried out to destroy the physical structure of the slag particles, so that the acid-soluble, The oxidizable state, reducible state and residue state are more fully reacted with the reducing agent after being leached by the agent.

[0058] The contaminated soil is transported to the ex-situ treatment area, and the contaminated soil enters the rod vibrating feeder to remove the grave...

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Abstract

The invention discloses a treatment method and treatment equipment for remedying hexavalent chromium-polluted soil. The treatment equipment comprises a vibrating feeding machine, a stone scrubber, a vibrating screen, a ball milling machine, a pulping machine, an adjusting tank, a stirring tank, a thickening machine, a plate-and-frame filter press and water treatment equipment. The treatment method comprises the steps as follows: (1) the polluted soil is screened or ground by the vibrating screen; (2) a material is sent into the pulping machine for pulping; (3) then pulp is sent to the adjusting tank, and the pH value is adjusted to range from 2 to 4; (4) the pulp is sent into the stirring tank to form chromium hydroxide precipitate, and the pH value is adjusted to range from 6 to 8; (5) solid-liquid separation and filter pressing dehydration are performed, and mud cakes are formed. The equipment runs stably and reliably, is convenient to mount and dismount and has the good elution effect; waste water is recycled after treatment and can be used for the cylinder stone scrubber and the pulping machine, water resources are greatly saved, and secondary pollution caused by discharge of sewage is also avoided; and the method and the equipment can also be applied to elution remediation projects of other heavy metal-polluted soil, and the use efficiency of the equipment is improved.

Description

technical field [0001] The invention belongs to the technical field of remediation and treatment of heavy metal-contaminated soil, and specifically relates to a treatment method and treatment equipment for remediation of hexavalent chromium-contaminated soil. Background technique [0002] Chromium is a hard, silvery-white metal that mainly occurs in three forms: metallic chromium, trivalent chromium and hexavalent chromium. All chromium compounds are toxic, of which hexavalent chromium is the most toxic. Hexavalent chromium is an ingestion poison / inhalation extremely poison, skin contact may cause sensitivity; it is more likely to cause hereditary gene defects, inhalation may cause cancer, and has a persistent danger to the environment. Hexavalent chromium is easily absorbed by the human body, and it can invade the human body through digestion, respiratory tract, skin and mucous membranes. The most harmful is the risk of cancer in long-term or short-term exposure or inhala...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/02B07B1/28B07B1/46
CPCB09C1/08B07B1/28B07B1/46B09C1/02
Inventor 李琼董小龙谢湉汤桂腾张海欧和利钊郑子健周永信
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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