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Method for preparing efficient ecological restoration floras for Hg contaminated site from biogas residues

A technology of ecological restoration and biogas residue, which is applied in the direction of using microorganisms and the recovery of contaminated soil, etc., can solve the problems of long reaction cycle, secondary pollution, high cost, etc., and achieve shortened cultivation and domestication cycle and strong natural tolerance , Enhance the effect of mercury resistance

Inactive Publication Date: 2016-09-28
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high temperature melting method is costly and consumes a lot of energy
The biological method has a long reaction cycle and is likely to cause secondary pollution by foreign biological agents
The effect of the curing method is unstable, and the curing agent is likely to cause secondary pollution to the soil
Patent No. 201510056406.6 introduces a solidification method for soil containing heavy metals, but this method uses a large amount of materials, and the cost is high. On the other hand, the solidification effect is unstable. For example, the added calcium oxide is prone to carbonation under natural conditions. Reduces the effect of alkaline curing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Mix biogas residue with a solution containing a certain amount of carbon source, add a certain amount of sulfate, and put it into a reactor for biochemical reaction. Control the content of dry biogas residue in the mixed solution to 0.5%, and the solid content to 10%, The organic carbon content is 12%, and the mass ratio of organic carbon / sulfate is 5:1, followed by reaction for 1 day;

[0016] (2) in the solution after step (1) reaction, add a certain amount of mercury salt, control the mol ratio (2-3) of sulfate / mercury: 1, the mass ratio (10-30) of organic carbon / mercury: 1, followed by 5 days of reaction;

[0017] (3) Add mercury to the solution twice, each time controlling the molar ratio of sulfate / mercury (2-3):1, the mass ratio of organic carbon / mercury (10-30):1, and the reaction time is 5 days , and then obtain highly efficient ecological restoration flora.

Embodiment 2

[0019] (1) Mix biogas residue with a solution containing a certain amount of carbon source, add a certain amount of sulfate, and put it into a reactor for biochemical reaction. Control the content of dry biogas residue in the mixed solution to be 8-10%, and the solid content to be 10- 15%,, the organic carbon content is 10-15%, the mass ratio of organic carbon / sulfate is 20:1, and then reacted for 0.1-1 day;

[0020] (2) in the solution after step (1) reaction, add a certain amount of mercury salt, control the mol ratio (1-5) of sulfate / mercury: 1, the mass ratio (30-80) of organic carbon / mercury: 1, followed by 0-1 days of reaction;

[0021] (3) Repeatedly adding mercury to the solution once, controlling the molar ratio of sulfate / mercury (1-5): 1, the mass ratio of organic carbon / mercury (30-80): 1, the reaction time is 1 day, and then obtains high-efficiency Ecological restoration flora.

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Abstract

The invention provides a method for preparing efficient ecological restoration floras for an Hg contaminated site from biogas residues. A carbon source and sulfate are added into the biogas residues, sulfate reducing floras in the biogas residues are made to grow rapidly, and meanwhile sulfide is generated; next, mercuric salt is added to consume the sulfide inhibiting growth of sulfate reducing bacteria, the toxicity of the mercuric salt on the sulfate reducing bacteria is greatly lowered due to existence of the sulfide, and meanwhile Hg resistance of the cultured sulfate reducing floras is improved.

Description

technical field [0001] The present invention provides a method for using biogas residues to prepare highly efficient ecological restoration flora in Hg-contaminated sites. By adding carbon sources and sulfate to biogas residues, sulfate-reducing bacteria in biogas residues can grow rapidly and produce sulfide at the same time; Adding mercury salt consumes sulfide that inhibits the growth of sulfate-reducing bacteria, and the presence of sulfide also greatly reduces the toxicity of mercury salt to sulfate-reducing bacteria, and at the same time improves the Hg resistance of the cultured sulfate-reducing bacteria. field of environmental protection. Background technique [0002] Due to the arbitrary discharge of mining and metallurgical wastewater, a large amount of soil is polluted by Hg. Current methods of treating mercury-containing soils are flawed. The high temperature melting method is costly and consumes a lot of energy. The biological method has a long reaction cycle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/36B09C1/10
CPCB09C1/10B09C2101/00C12N1/36
Inventor 张大磊徐海清李健孙箫
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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