Restoration method of chromium-polluted soil

A chromium-contaminated soil and process technology, applied in the restoration of contaminated soil, etc., to achieve the effect of no secondary pollution, high economic benefits, and efficient restoration

Active Publication Date: 2015-10-07
YONKER ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem solved by the invention is to make the chromium-contaminated soil remediation process simple, with high treatment efficiency, no secondary pollution, and high economic benefits

Method used

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  • Restoration method of chromium-polluted soil

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Embodiment

[0039] Embodiment: This embodiment provides a kind of remediation process of chromium-contaminated soil, and the technological process is as follows figure 1 As shown, the specific steps are as follows:

[0040] (1) In this embodiment, the total chromium content in the chromium-contaminated soil of a certain chromium salt factory is 25000-30000 mg / kg. pH=10.0~10.5. The chromium-contaminated soil was crushed, sieved, and piled up to prepare a 2%wt potassium permanganate solution, and adjust the pH value to 4~5 with sulfuric acid. The prepared oxidant solution is sprayed downward from the upper part of the piled soil, and the effluent containing hexavalent chromium flowing out from the lower part of the pile is collected. When the amount of the aqueous solution containing the oxidant reaches 5 times the volume of the soil, stop spraying to obtain hexavalent chromium soil.

[0041] (2) Spray the hexavalent chromium soil with an aqueous solution containing sodium sulfate as the...

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Abstract

The invention discloses a restoration method of chromium-polluted soil. The restoration method comprises following steps: (1) an oxidizing agent is added into chromium-polluted soil so as to convert chromium into chromium VI via oxidation and obtain soil containing chromium VI; (2) a leacheate is added into the soil containing chromium VI for leaching or/and elution so as to obtain slightly toxic soil with chromium VI residue and a leacheate containing chromium VI, wherein the leacheate is an aqueous solution containing a desorption agent, and the desorption agent is a soluble sulfate; and (3) a reducing agent is added into the slightly toxic soil so as to realize reduction of the chromium VI residue and obtain nontoxic soil. Beneficial effects of the restoration method are that: high efficiency restoration of chromium-polluted soil can be realized; no secondary pollution is caused; the sulfate is taken as the desorption agent; desorption effect is excellent; and economic benefit is excellent.

Description

technical field [0001] The invention relates to a chromium-contaminated soil remediation process. Background technique [0002] The common forms of chromium in the natural environment are trivalent chromium and hexavalent chromium. Trivalent chromium in chromium-contaminated soil often exists in the form of insoluble hydroxides, which are generally low or slightly toxic, and have low fluidity. It is not easy to spontaneously oxidize to hexavalent chromium; the toxicity of hexavalent chromium is 100 times that of trivalent chromium, and it has strong fluidity, and it is easier to migrate than trivalent chromium to cause the enrichment of the biological chain. Mutagenicity and carcinogenicity, interfere with the normal absorption and transportation of other elements by the roots of crops, enrich from the lower end of the biosphere through the food chain, denature proteins in animals, and interfere with enzyme systems. Hexavalent chromium is mainly chronically poisonous to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/02
Inventor 贺前锋宋乐山言海燕阙雄杰赵迪
Owner YONKER ENVIRONMENTAL PROTECTION
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