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Method for preparing efficient ecological restoration floras for Cd contaminated site from sludge

A technology of ecological restoration and sludge, applied in the direction of using microorganisms, restoration of contaminated soil, etc., can solve the problems of long reaction cycle, high cost, secondary pollution, etc., achieve shortening of cultivation and domestication cycle, and enhance cadmium resistance , the effect of strong natural tolerance

Inactive Publication Date: 2016-09-28
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Abstract
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  • 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 the sludge 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 dry sludge content of 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 cadmium salt, control the mol ratio (2-3) of sulfate / cadmium: 1, the mass ratio (10-30) of organic carbon / cadmium: 1, followed by 5 days of reaction;

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

Embodiment 2

[0019] (1) Mix the sludge with a solution containing a certain amount of carbon source, add a certain amount of sulfate, put it into the reactor for biochemical reaction, control the dry sludge content of the mixed solution to 8-10%, and the solid content to 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 cadmium salt, control the mol ratio (1-5) of sulfate / cadmium: 1, the mass ratio (30-80) of organic carbon / cadmium: 1, followed by 0-1 days of reaction;

[0021] (3) Add cadmium salt repeatedly to the solution once, control the molar ratio of sulfate / cadmium (1-5):1, the mass ratio of organic carbon / cadmium (30-80):1, the reaction time is 1 day, and then Obtain efficient ecological restoration flora.

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Abstract

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

Description

technical field [0001] The present invention provides a method for using sludge to prepare highly efficient ecological restoration flora of Cd-contaminated sites, by adding carbon source and sulfate to the sludge, the sulfate-reducing flora in the sludge grows rapidly and produces sulfide at the same time; Adding cadmium salt consumes the sulfide that inhibits the growth of sulfate-reducing bacteria, and the presence of sulfide also greatly reduces the toxicity of cadmium salt to sulfate-reducing bacteria, and at the same time improves the Cd resistance of the cultured sulfate-reducing bacteria. field of environmental protection. Background technique [0002] Due to the random discharge of mining and metallurgical wastewater, a large amount of soil has been polluted by Cd. Current methods for treating cadmium-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 and is likel...

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 张大磊李公伟郝志鹏赵昱皓
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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