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Chromium-polluted soil total-chromium ex-situ treatment method

A technology for chromium-contaminated soil and contaminated soil is applied in the field of total chromium ex-situ treatment of chromium-contaminated soil, and achieves the effects of quick effect, significant environment, and solving secondary hidden dangers

Inactive Publication Date: 2014-07-30
BEIJING GUOHUAN JIANBANG ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although ectopic leaching increases the mining and transportation of contaminated media, the restoration process becomes controllable and the treatment efficiency is also improved accordingly

Method used

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  • Chromium-polluted soil total-chromium ex-situ treatment method

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Effect test

Embodiment 1

[0017] Taking the treatment of chromium-contaminated soil in a polluted site as an example, the total chromium content of the soil is 2641mg / L, and the Cr(VI) content is 1459mg / L.

[0018] A kind of total chromium heterotopic treatment method of chromium polluted soil, comprises the following steps:

[0019] 1) Sieve the polluted soil to remove foreign matter, sieve the soil with a particle size of less than 1cm, crush hard blocks with a diameter greater than 1cm, and remove foreign matter;

[0020] 2) Sieve the soil and send it to the primary leaching unit, fully mix it with 1# extractant, and start the primary leaching; 1# extractant is an aqueous solution of 500kg0.1mol / L sodium hydroxide and 0.05mol / L EDTA-2Na , the liquid-solid ratio is 10:1, the pH value is 12.2, shake for 20 minutes, and settle for 40 minutes;

[0021] 3) The leachate enters the corresponding water treatment facilities and is reused after reaching the standard;

[0022] 4) The leached soil is sent to ...

Embodiment 2

[0030] Taking the treatment of chromium-contaminated soil in a polluted site as an example, the total chromium content of the soil is 5645mg / L, and the Cr(VI) content is 3268mg / L.

[0031] A kind of total chromium heterotopic treatment method of chromium polluted soil, comprises the following steps:

[0032] 1) Sieve the polluted soil to remove foreign matter, sieve the soil with a particle size of less than 1cm, crush hard blocks with a diameter greater than 1cm, and remove foreign matter;

[0033] 2) Sieve the soil and send it to the primary leaching unit, fully mix it with 1# extractant, and start the primary leaching; the primary leaching is divided into two times, the first time: 1# extractant is 500kg0.6mol / L hydrogen The aqueous solution of sodium oxide and 0.3mol / L EDTA-2Na, the liquid-solid ratio is 15:1, the pH value is 12.6, oscillating for 30 minutes, precipitation for 45 minutes; the second time: 1# extractant is 330kg0.2mol / L citric acid and 0.1mol / L aqueous sol...

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Abstract

The invention discloses a chromium-polluted soil total-chromium ex-situ treatment method. The chromium-polluted soil total-chromium ex-situ treatment method comprises that Cr(VI), Cr(III) and Cr(III) complex are subjected to staged leaching by two extracting agents, and concretely comprises carrying out leaching on high-water solubility Cr(VI) and hydrous Cr(III) by a first-grade leaching unit adopting a sodium hydroxide-EDTA-2Na mixed solution as the extracting agent, carrying out leaching on Cr(III) and its complex by a second-grade leaching unit adopting a citric acid-sulfuric acid mixed solution as the extracting agent, adding a proper amount of a conditioning agent into the leached soil, carrying out full stirring, carrying out backfilling, treating the leached supernatants obtained by the leaching units, and feeding the leached supernatants back to the corresponding leaching units. The chromium-polluted soil total-chromium ex-situ treatment method can remove Cr(VI) pollutants in a polluted place, guarantee total chromium content level reaching the standard and realize thorough treatment on Cr pollution in the place and has no secondary pollution hidden trouble.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control and restoration, and in particular relates to a total chromium heterotopic treatment method for chromium-contaminated soil. Background technique [0002] As of 2013, nearly 20 million hectares of soil was polluted by heavy metals in my country, including nearly 5 million hectares of chromium-contaminated soil. The hazards of heavy metal pollution in soil are concealed, lagging and long-term. They enter the food chain through plant absorption, posing a threat to the life and health of animals, plants and human beings. ecosystem. Therefore, the polluted land must be rehabilitated before it can be redeveloped and utilized. [0003] At present, the treatment technologies for chromium-contaminated soil mainly include chemical methods (pharmaceutical leaching, reduction precipitation, thermal decomposition, etc.), physical methods (electrode repair, etc.), microbial reduction methods, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
Inventor 邢旭辉魏家俊宋迎春崔夏焦小陇苗睿
Owner BEIJING GUOHUAN JIANBANG ENVIRONMENTAL SCI & TECH
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