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Method for removing heavy metals in soil through combination of bioleaching and Fenton reaction

A biological leaching and heavy metal technology, applied in the restoration of contaminated soil, etc., can solve the problem of high treatment costs, achieve the effect of small secondary pollution, efficient removal, and low operating costs

Inactive Publication Date: 2016-08-31
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional Fenton reaction needs to add acid to maintain the reaction in a certain pH range, resulting in higher processing costs

Method used

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  • Method for removing heavy metals in soil through combination of bioleaching and Fenton reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The contaminated soil samples for the test were taken from the 0-20 cm surface soil of the farmland surrounding the Fankou lead-zinc mine in Shaoguan City, Guangdong Province. Crush the large samples in the soil, place them in a cool and dry place to air-dry naturally, remove stones, rhizomes and other sundries, and pass through a 2mm sieve for later use. The main physical and chemical properties of the soil were tested as follows: pH 5.80±0.04, organic matter content (10.94±0.71)%, heavy metal Cu, Zn, Pb and Cd content were (81.86±3.63), (378.93±10.87), (326.89±11.15 ) and (0.67±0.05) mg·kg -1 .

[0037] Thiobacillus ferrooxidans isolated from sludge Thiobacillus ferrooxidans LX 5 , the strain was preserved and donated by the College of Resources and Environment, Nanjing Agricultural University, CGMCC NO.0727 (see invention patent ZL02112924.X). will LX 5 The strain was inoculated into the test soil solution with a solid content of 1% sterilized by radiation, and...

Embodiment 2

[0040] The preparation of the test soil sample and the inoculum of Thiobacillus ferrooxidans was the same as in Example 1.

[0041] After sterilizing the test soil by radiation, prepare a soil solution with a solid content of 2% with sterile distilled water; add FeSO 4 ·7H 2 O as a substrate to Fe in soil solution 2+ The content reaches 4g•L -1 , the inoculum of Thiobacillus ferrooxidans whose inoculation quality is 10% of the mass of soil solution, at 150r·min -1 , Shaking culture at 30°C. When the pH of the solution dropped to 2.5±0.1, add H 2 o 2 up to 9g•L -1 After the final concentration was subjected to Fenton reaction for 1 day, samples were taken to detect and analyze the dissolution efficiency of Cu, Zn, Cd and Pb. After detection and analysis, the dissolution rates of Cu, Zn, Cd and Pb were 60.3%, 52.7%, 65.9% and 30.7%, respectively.

Embodiment 3

[0043] The preparation of the test soil sample and the inoculum of Thiobacillus ferrooxidans was the same as in Example 1.

[0044] After sterilizing the test soil by radiation, prepare a soil solution with a solid content of 1% with sterile distilled water; add FeSO 4 ·7H 2 O as a substrate to Fe in soil solution 2+ The content reaches 3g•L -1 , the inoculum of Thiobacillus ferrooxidans whose inoculation quality is 10% of the mass of soil solution, at 150r·min -1 , Shaking culture at 30°C. When the pH of the solution drops to 3.0±0.1, add H 2 o 2 up to 5g•L -1 After the final concentration was subjected to Fenton reaction for 1 day, samples were taken to detect and analyze the dissolution efficiency of Cu, Zn, Cd and Pb. After detection and analysis, the dissolution rates of Cu, Zn, Cd and Pb were 64.5%, 54.1%, 66.5% and 29.3%, respectively.

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Abstract

The invention provides a method for removing heavy metals in soil through combination of bioleaching and a Fenton reaction. The method comprises the following steps that (1) polluted soil is mixed into a soil solution with water; (2) ferrous salt is added into the soil solution, an acidophilic thiobacilli bacterium solution is inoculated, and bioleaching is carried out; and (3) an H2O2 solution is added to conduct the Fenton reaction. Through combination of bioleaching and the Fenton reaction, the heavy metals in the soil can be effectively removed, and the treatment effect is remarkably better than the treatment effect obtained through H2SO4 acidification and the Fenton reaction; and meanwhile, the soil restoration cycle can be remarkably shortened, and the method is a heavy metal polluted soil restoration technology having wide application prospects.

Description

technical field [0001] The invention relates to a method for removing heavy metals in soil by using biological leaching combined with Fenton reaction. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" (China Environmental Protection Industry, 2014, (5): 10-11), the overall situation of my country's soil environment is not optimistic, and 8 heavy metal pollution types such as Cd, Hg, As, and Cu are dominant. Especially in some southern regions, the problem of heavy metal pollution is more prominent, which seriously threatens the safety of agricultural products and human health. There are mainly two types of methods for the remediation of heavy metal-contaminated soils: fixed passivation and removal. The former is to reduce the biological activity of heavy metals by changing the storage form of heavy metals in the soil, but when the soil pH, oxidation-reduction potential (ORP), etc. change, the passivated heavy metals may be activated ag...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/10
Inventor 余震庄莉汤佳周普雄王跃强
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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