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Chromium pollution soil in-situ leaching treatment method

A technology for chromium-contaminated soil and a treatment method, which is applied in the field of in-situ leaching treatment of chromium-contaminated soil, can solve the problems of long construction period, need for engineering ground breaking, high energy consumption and cost, and achieves low power consumption, low treatment cost, and operation. easy effect

Inactive Publication Date: 2012-09-05
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is also the use of medicaments to carry out reduction stabilization ectopic repair technology (application publication number CN102189099A, application publication number CN101708501A), using FeSO 4 or Na 2 SO 3 Reduction and stabilization, this technology has a short construction period, but requires engineering groundbreaking, high energy consumption and cost, and is more suitable for areas with serious pollution and shallow pollution depth
Other technologies mainly focus on microbial remediation technology (publication number CN101602060A, application publication number CN101829674A, publication number CN201815540U), but the construction period is very long and often takes several years

Method used

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  • Chromium pollution soil in-situ leaching treatment method
  • Chromium pollution soil in-situ leaching treatment method
  • Chromium pollution soil in-situ leaching treatment method

Examples

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Embodiment 1

[0028] Take the treatment of chromium-contaminated workshops left over from Haibei Chromium Salt Chemical Plant in Qinghai as an example. The chemical plant was put into operation in 1988 and was forced to close in 1989 due to serious pollution. The plant's leaching workshop (plant area 150m×40m) is seriously polluted, and the soil from the surface to the underground water table (18 meters deep) is seriously polluted. Among them, the concentration of hexavalent chromium in the soil of 0-3 meters in the surface layer is between 3000-14000mg / kg, and the concentration of hexavalent chromium in the soil of 3-18 meters is about 2000mg / kg. The soil structure of the site is simple, with no missing layers, water-repellent layers, and no short-flow channels. The soil 0-3 meters is loess-like soil, the permeability coefficient is 2.5×10 -3 cm / s, below 3 meters to the groundwater level is a gravel layer, with a permeability coefficient of 0.243cm / s, which is suitable for the technical ...

Embodiment 2

[0039] Take the treatment of contaminated soil at the chromium slag dump site of Qingdao Hongxing Chemical Plant as an example. The plant was put into production in 1959, and the production of chromium salts was stopped in 1991 due to environmental protection issues. The original chromium slag storage yard is located by the Loushan River, covering an area of ​​about 600m×200m. Due to the accumulation of chromium slag for many years, the site was seriously polluted by chromium. Among them, the concentration of hexavalent chromium in the surface soil reaches 142-9759mg / kg, and the concentration of hexavalent chromium in the groundwater of the site reaches 200mg / L, far exceeding the requirement of 0.05mg / L required by the third-class water quality standard for groundwater. The strongly weathered granite layer in the whole area is mainly composed of three layers of miscellaneous fill, silty clay and coarse sand.

[0040] Proceed as follows:

[0041] 1) A 6m×4m×1m pit was dug in...

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Abstract

The invention relates to a chromium pollution soil in-situ leaching treatment method which is implemented in a way that: the periphery of the soil region in need of leaching treatment is provided with a plurality of groundwater extraction wells; water is sprayed on the ground to leach the polluted soil; the hexavalent-chromium-containing leaching water enters the groundwater; and under the control of a groundwater flow field, the hexavalent-chromium-containing leaching water is sucked to the ground surface; and the water is treated and recycled for ground spraying leaching. The hexavalent chromium content of the soil treated by the method can be reduced from 1000mg / kg to less than 100mg / kg.

Description

technical field [0001] The invention belongs to the technical field of remediation and treatment of contaminated soil, and in particular relates to an in-situ leaching treatment method for chromium-contaminated soil. Background technique [0002] Historically, there used to be more than 70 chromium salt production enterprises in my country, and there are currently 14 chromium salt production enterprises. Because the chromium salt production enterprises in our country are generally small in scale, outdated in production technology and heavy in environmental pollution, these closed chromium salt factories have caused great environmental pollution problems in the leftover sites. The content of hexavalent chromium in the soil of some polluted sites reaches tens of thousands of mg / kg; the concentration of Cr(VI) in the groundwater reaches more than 1000mg / L, which far exceeds the requirements of the Class III water quality standard for groundwater environmental quality (GB / T 1484...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
Inventor 王兴润颜湘华王琪
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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