Method for microorganism-chemical method combined remediation of heavy metal contaminated soil

A combined restoration and polluted soil technology, applied in the field of contaminated soil treatment, can solve the problems of short repair period and achieve the effect of reducing treatment cost, low technical requirements and low investment

Inactive Publication Date: 2018-01-23
湖南新九方科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] To sum up, there is still a lack of a method with a short remediation peri...

Method used

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  • Method for microorganism-chemical method combined remediation of heavy metal contaminated soil
  • Method for microorganism-chemical method combined remediation of heavy metal contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for combined microbial-chemical method restoration of arsenic-containing heavy metal compound polluted soil, comprising the following steps:

[0043] 1) Mix the above-mentioned cultivated magnetotactic bacteria with the soil with a thickness of 11 cm on the surface layer of arsenic-containing heavy metal-contaminated soil, and the addition ratio of magnetotactic bacteria is 8.0×10 per square meter of heavy metal-contaminated soil. 9 A magnetotactic bacterium was cultivated for 58 days;

[0044] 2) Carry out mulch film sticking to the ground covering the arsenic-containing heavy metal compound polluted soil in step 1), keep the heavy metal polluted soil in anoxic state, and place a magnet on the heavy metal polluted soil to form a magnetic field, the direction of the magnetic field is away from the ground and upward, and the magnetic field strength is 300 Gauss, keep for 35 days;

[0045] 3) Collect step 2) soil with a thickness of 8 cm on the surface layer of ...

Embodiment 2

[0052] A method for combined microbial-chemical method restoration of arsenic-containing heavy metal compound polluted soil, comprising the following steps:

[0053] 1) Mix the above-mentioned cultivated magnetotactic bacteria with the soil with a thickness of 11 cm on the surface layer of arsenic-containing heavy metal-contaminated soil, and the addition ratio of magnetotactic bacteria is 2.0×10 per square meter of heavy metal-contaminated soil. 10 A magnetotactic bacterium was cultivated for 56 days;

[0054] 2) Carry out mulch film sticking to the ground covering the arsenic-containing heavy metal compound polluted soil in step 1), keep the heavy metal polluted soil in anoxic state, and place a magnet on the heavy metal polluted soil to form a magnetic field, the direction of the magnetic field is away from the ground and upward, and the magnetic field strength is 400 gauss, keep for 36 days;

[0055] 3) Collect step 2) soil with a thickness of 9 cm on the surface layer of...

Embodiment 3

[0062] A method for combined microbial-chemical method restoration of arsenic-containing heavy metal compound polluted soil, comprising the following steps:

[0063] 1) Mix the above-mentioned cultivated magnetotactic bacteria with the soil with a thickness of 12 cm on the surface layer of arsenic-containing heavy metal-contaminated soil, and the addition ratio of magnetotactic bacteria is 3.5×10 per square meter of heavy metal-contaminated soil. 10 A magnetotactic bacterium was cultivated for 58 days;

[0064] 2) Carry out mulch film sticking to the ground covering the arsenic-containing heavy metal compound polluted soil in step 1), keep the heavy metal polluted soil in anoxic state, and place a magnet on the heavy metal polluted soil to form a magnetic field, the direction of the magnetic field is away from the ground and upward, and the magnetic field strength is 420 gauss, keep for 37 days;

[0065] 3) Collect step 2) soil with a thickness of 7 cm on the surface layer of...

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Abstract

The invention provides a method for microorganism-chemical method combined remediation of heavy metal contaminated soil. The method comprises the following steps: magnetotactic bacteria is inoculatedinto heavy metal contaminated surface soil for culture for 55-60 days; the soil, treated in the previous step, is covered by using a plastic film, and a magnetic field is kept for 35-40 days; shallow-layer soil, treated in the previous step, is collected and leached by using water, and an original place is filled with the soil after leaching; the steps are circularly repeated until the contents ofheavy metals besides As reach the national environmental requirement standards; and dissoluble iron salt is added in the soil remediated in the previous step, then, calcium salt is added, wherein thedissoluble iron salt comprises at least one of ferrous sulfate, iron chloride and ferrous chloride, and the adding quantity is 0.5-15 wt% of the weight of the soil. Compared with a traditional arsenic-contained heavy metal contaminated soil treatment method, the method is low in investment and technical requirement, prevents activation of other heavy metal in arsenic stabilization, and is excellent in soil remediation effect and high in practicability.

Description

technical field [0001] The invention belongs to the field of contaminated soil treatment, and in particular relates to a method for combined microbial-chemical method restoration of heavy metal-contaminated soil. Background technique [0002] Soil heavy metal pollution refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. Heavy metals refer to metals with a specific gravity equal to or greater than 5.0, mainly including elements with significant biological toxicity such as mercury, cadmium, lead, chromium, and metalloid arsenic, as well as elements with certain toxicity such as zinc, copper, and nickel. As a metalloid element, arsenic has similar properties to heavy metals. After entering the soil, arsenic also reacts with various components in the soil through different modes of action such as dissolution, co...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10B09C1/00
Inventor 杨添奇纪智慧成一知
Owner 湖南新九方科技有限公司
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