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Method for preparing efficient ecological restoration flora for Cr (VI)-containing site by utilizing biogas residue

A technology of ecological restoration and biogas residue, which is applied in the direction of using microorganisms and restoration of contaminated soil, etc., can solve the problems of long treatment time, secondary pollution, long domestication cycle, etc., and achieve the reduction of cultivation and domestication cycle and natural tolerance The effect of strong power and improved economy

Inactive Publication Date: 2016-09-21
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can restore chromium-containing soil, it consumes a lot of electricity and takes a long time to treat, so it is not suitable for large-scale disposal of chromium-containing soil.
However, the chemical reagents such as ferrous iron or sulfide used in the current in-situ repair method also have the problem of secondary pollution, and are easily oxidized by the environment to cause functional failure.
Patent No. 201310642919.6 introduces a method for in-situ restoration of Cr(VI)-containing sites using organic waste, which is a low-cost way to dispose of hexavalent chromium soils, but this method can only be used for soils with a natural anti-seepage layer at the bottom , otherwise it will accelerate the penetration of hexavalent chromium into the ground, resulting in the diffusion of hexavalent chromium
Patent 201310643015.5 introduces a method of using biogas residues to prepare Cr(VI)-contaminated site restoration flora. This method uses biogas residues and other organic wastes as raw materials, and through a special culture method, domesticates bacteria flora suitable for chromium-containing site restoration. However, the domestication period of this method is too long, which is not conducive to engineering practice

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] (1) Mix biogas residue with a solution containing a certain amount of carbon source, add a certain amount of sulfate, 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;

[0017] (2) in the solution after step (1) reaction, add a certain amount of chromate, control the mol ratio (2-3) of vitriol / chromate: 1, the mass ratio of organic carbon / chromium (10- 30): 1, followed by reaction for 5 days;

[0018] (3) Repeatedly add chromate 2 times to the solution, each time controlling the molar ratio (2-3) of sulfate / chromate: 1, the mass ratio of organic carbon / chromium (10-30): 1, The reaction time was 5 days, and then the highly efficient ecological restoration flora was obtained.

Embodiment 2

[0020] (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 0.05 days;

[0021] (2) in the solution after step (1) reaction, add a certain amount of chromate, control the mol ratio (1-5) of vitriol / chromate: 1, the mass ratio of organic carbon / chromium (30- 80): 1, then reacted for 0.05 days;

[0022] (3) Then control the molar ratio of sulfate / chromate (1-5):1, the mass ratio of organic carbon / chromium (30-80):1, and the reaction time is 0.05 days, and then obtain an efficient ecological restoration flora.

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Abstract

The invention provides a method for preparing an efficient ecological restoration flora for a Cr (VI)-containing site by utilizing biogas residue. According to the method, by adding a carbon source and sulfate into the biogas residue, a sulfate reducing flora in the biogas residue rapidly grows, and sulfides are generated at the same time; then, chromate is added into the biogas residue, and the sulfides capable of inhibiting the growth of the sulfate reducing bacteria are consumed; due to the existence of the sulfides, the toxicity of the chromate to the sulfate reducing bacteria is greatly reduced, and the Cr (VI) resistance of the cultured sulfate reducing flora is also improved.

Description

technical field [0001] The invention provides a method for using biogas residues to prepare high-efficiency ecological restoration flora of Cr(VI)-containing sites. By adding carbon source and sulfate to biogas residues, the sulfate-reducing flora in biogas residues can grow rapidly and produce sulfide at the same time. Then add chromate to consume sulfide that inhibits the growth of sulfate-reducing bacteria, and the presence of sulfide also greatly reduces the toxicity of chromate to sulfate-reducing bacteria, and at the same time makes the cultured sulfate-reducing bacteria resistant The performance of Cr(VI) is improved, which belongs to the field of environmental protection. Background technique [0002] Chromium and its compounds are commonly used basic raw materials in metallurgy, metal processing, electroplating, tanning, paint, pigment and other industries. During the production process of the above industries, a large amount of chromium-containing waste gas, waste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/36B09C1/10
CPCC12N1/36B09C1/10
Inventor 张大磊李健孙萧
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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