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Method for jointly repairing heavy metal contaminated soil at mining areas through microorganism-chemical method

A combined restoration and contaminated soil technology, applied in the field of soil restoration, can solve the problems of small environmental pollution, high cost, secondary pollution, etc., and achieve the effect of small environmental pollution, low treatment cost and good treatment effect

Active Publication Date: 2013-12-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high cost and easy to cause secondary pollution in the current heavy metal-contaminated soil remediation technology, and provide a method for using microorganisms (sulfate-reducing bacteria)-chemical leaching to jointly remediate heavy metal-contaminated soil in mining areas. The method has the advantages of easy manipulation, low processing cost and little environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Select 5 sampling points near a certain mining area, collect 2kg of soil samples (5-20cm) with a soil collector, mix them well and put them into a brown sample bottle. Pour the soil sample into an enamel tray and air-dry it indoors, then crush and grind it, pass through a 10-20 mesh sieve, pour it into a brown bottle and store it in the refrigerator. Cu, Cr, and Pb in the soil are all used in HF-HNO 3 -HC1O 4 Digestion, the concentrations of Cu, Cr, and Pb in the digestion liquid were measured by inductively coupled plasma emission spectrometry, and the results are as follows (unit: mg / kg):

[0025] Cu: 38.1~89.4; Cr: 50.2~94.6; Pb: 70.5~168.4

[0026] The pretreated polyurethane foam was filled in a corked Erlenmeyer flask as an immobilized carrier, and the inoculation amount of bacteria was 8%-20% (V / V). The mining and metallurgy wastewater with high concentration of sulfate is configured as a medium, SO 4 2- The content is about 2.0g·L -1 ; The remaining ingred...

Embodiment 2

[0029] Soil sampling and detection are the same as in Example 1.

[0030] The pretreated porous ceramic rings were filled in the Erlenmeyer flasks with stoppers as immobilized carriers, and the inoculum amount of bacteria was 10%-25% (V / V). The mining and metallurgy wastewater with a high concentration of sulfate is configured as a culture medium (same as in Example 1), and the cultivation temperature is maintained at 30-40°C by an incubator. After the sulfate conversion rate reaches more than 85%, the concentration of sulfate in the medium is gradually increased to maintain the sulfate concentration in the reactor greater than 2.0g L -1 , the COD in the medium also increases correspondingly, maintaining the COD / SO in the medium 4 2- The ratio is constant at about 3.0; 5-7d is the cycle for activation. When the total sulfide production is continuously stable above about 500 mg / L, the bacterial solution is used to treat the contaminated soil sample.

[0031] Take 2g of siev...

Embodiment 3

[0033] Soil sampling and detection are the same as in Example 1.

[0034] The pretreated polyurethane foam was filled in a corked Erlenmeyer flask as an immobilized carrier, and the inoculum amount of bacteria was 20%-35% (V / V). The mining and metallurgy wastewater with a high concentration of sulfate is configured as a culture medium (same as Example 1), and the culture temperature is maintained at 30-35° C. through a thermostat. After the sulfate conversion rate reaches more than 85%, the concentration of sulfate in the medium is gradually increased to maintain the sulfate concentration in the reactor greater than 2.0g L -1 , the COD in the medium also increases correspondingly, maintaining the COD / SO in the medium 4 2- The ratio is constant at about 3.0; 5-7d is the cycle for activation. When the total sulfide production is continuously stable above about 500 mg / L, the bacterial solution is used to treat the contaminated soil sample.

[0035] Take 2g of sieved air-dried...

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Abstract

The invention provides a method for jointly repairing heavy metal contaminated soil at mining areas through a microorganism-chemical method. According to the method, a method that sulfate-reducing bacteria are adopted to reduce sulfate is adopted to generate hydrogen sulfide which is regarded as a precipitating agent of heavy metal; the heavy metal in soil is transferred into a liquid phase by adopting a surfactant chemical leaching method, sulfate-reducing bacteria liquid is added into soil and the leacheate respectively to transfer residual heavy metal in soil into a stable state from an exchangeable state, so that the purpose of effectively treating heavy metal contaminated soil at the mining areas is achieved. The treatment method provided by invention is low in cost, the process is convenient and simple, and easy to operate and control, the environmental pollution is less, the treatment effect is good, and the method has a wide industrial application prospect.

Description

technical field [0001] The invention relates to a soil remediation method, in particular to a method for combined remediation of heavy metal-contaminated soil in mining areas by using sulfate reducing bacteria (SRB, sulfate reducing bacteria) microbial method and chemical leaching method, which belongs to the field of soil pollution control. Background technique [0002] Mining and metallurgy activities are the main source of heavy metal pollution. The mining process produces a large amount of solid waste, including stripped waste soil, waste rock and tailings. These wastes are simply piled on the land surface, causing serious environmental pollution to surrounding areas, such as the Dexing copper mine in Jiangxi and the lead-zinc mines in Shaoguan and Lechang in Guangdong. In recent years, incidents of "excessive blood lead" among children have occurred successively in Fengxiang, Shaanxi, Wugang, Hunan, and Dongchuan District, Kunming, making heavy metal pollution a hot iss...

Claims

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Application Information

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IPC IPC(8): B09C1/10B09C1/08
Inventor 曹俊雅曹晓雅张广积李媛媛杨超
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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