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Bio-remediation method of hexachlorobenzene-contaminated soil

A technology for contaminated soil and bioremediation, applied in the field of soil remediation, can solve the problems of secondary pollution chemical remediation method reaction conditions, long bioremediation technology restoration time, poor engineering feasibility, etc., achieving strong engineering feasibility and easier to be degraded by microorganisms , the effect of increasing the contact area

Active Publication Date: 2014-01-22
BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a bioremediation method for hexachlorobenzene-contaminated soil, which solves the problems of high cost and secondary pollution in the current physical remediation method of hexachlorobenzene-contaminated soil and the harsh reaction conditions and poor engineering feasibility of the chemical remediation method. Solve the problem of long repair time of traditional bioremediation technology

Method used

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  • Bio-remediation method of hexachlorobenzene-contaminated soil

Examples

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example 1

[0027] For contaminated soil with a hexachlorobenzene concentration of 2.6mg / kg, the treatment steps are as follows:

[0028] 1. Air-dry the contaminated soil, crush and grind it through a 2mm sieve twice to ensure that the soil is fully mixed;

[0029] 2. Take 2000g of sieved polluted soil sample, place it in a well-sealed slurry reactor, add 2000ml of distilled water and 8g of acetic acid;

[0030] 3. Use a vacuum pump to evacuate the above-mentioned reaction vessel, then slowly introduce nitrogen, then evacuate again, and then slowly fill with nitrogen, repeat this three times until the reaction vessel is an oxygen-free environment, and then quickly seal the reaction vessel;

[0031] 4. Put the sealed mud reactor in a light-proof environment, and let it stand at a reaction temperature of 45°C for 18 days;

[0032] 5. Separating the mixed slurry after the reaction from solid to liquid, and analyzing and detecting the hexachlorobenzene in the mud sample.

[0033] Table 1 sh...

example 2

[0036] For contaminated soil with a hexachlorobenzene concentration of 2.06mg / kg, the treatment steps are as follows:

[0037] 1. Air-dry the contaminated soil, crush and grind it through a 2mm sieve twice to ensure that the soil is fully mixed;

[0038] 2. Take 2000g of sieved polluted soil samples, place them in a well-sealed slurry reactor, add 2000ml of distilled water and 16g of acetic acid, and adjust the initial pH value of the reaction system to 5;

[0039] 3. Use a vacuum pump to evacuate the above-mentioned reaction vessel, then slowly introduce nitrogen, then evacuate again, and then slowly fill with nitrogen, repeat this three times until the reaction vessel is an oxygen-free environment, and then quickly seal the reaction vessel;

[0040] 4. Put the sealed mud reactor in a light-proof environment, and let it stand at a reaction temperature of 45°C for 18 days;

[0041] 5. Separating the mixed slurry after the reaction from solid to liquid, and analyzing and detec...

example 3

[0045] For contaminated soil with a hexachlorobenzene concentration of 2.06mg / kg, the treatment steps are as follows:

[0046] 1. Air-dry the contaminated soil, crush and grind it through a 2mm sieve twice to ensure that the soil is fully mixed;

[0047] 2. Take 2000g of sieved polluted soil sample, place it in a well-sealed mud reactor, add 2000ml of distilled water and 32g of acetic acid, and adjust the initial pH value of the reaction system to 6;

[0048] 3. Use a vacuum pump to evacuate the above-mentioned reaction vessel, then slowly introduce nitrogen, then evacuate again, and then slowly fill with nitrogen, repeat this three times until the reaction vessel is an oxygen-free environment, and then quickly seal the reaction vessel;

[0049] 4. Put the sealed mud reactor in a light-proof environment, and let it stand at a reaction temperature of 45°C for 18 days;

[0050] 5. Separating the mixed slurry after the reaction from solid to liquid, and analyzing and detecting t...

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Abstract

The invention discloses a bio-remediation method of hexachlorobenzene-contaminated soil, which comprises the following steps: preparing soil particles; adding deoxidized distilled water and a small-molecular organic acid nutrition source; regulating the initial pH value of the reaction system; adding nitrogen to create an oxygen-free environment; and performing an anaerobic degradation reaction by use of indigenous microorganisms in the soil, etc. According to the characteristics of strong vitality, adaptability and decomposition capacity of the indigenous microorganisms in the environment contaminated for long time, the method disclosed by the invention makes full use of the anaerobic indigenous microorganisms in the hexachlorobenzene-contaminated soil and directly performs quick remediation on the hexachlorobenzene-contaminated soil by use of the indigenous microorganisms in the soil under the condition of adding the small-molecular organic acid as a nutrition source. The method is simple and convenient to operate, the reaction conditions are mild, the operation cost is low, secondary pollution is avoided, the reaction time is short, and the engineering feasibility is high. The removal rate of hexachlorobenzene in the remediated contaminated soil is close to 60%, and thus the harm to the environment and human body caused by the hexachlorobenzene-contaminated soil is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, in particular to a rapid bioremediation method for soil polluted by hexachlorobenzene. Background technique [0002] Hexachlorobenzene is one of the first 12 persistent organic pollutants (POPs) controlled by the United Nations Environment Program International Convention. It is used in pesticides, fungicides, synthetic rubber additives, wood preservatives, organic synthetic chemical raw Production, processing of graphite anodes, production of military fumes, and fabrication of aluminum or other metals. At present, the soil pollution caused by hexachlorobenzene in my country has reached a relatively serious level. For example, the concentration of hexachlorobenzene in the soil of a dye factory production enterprise has been detected as high as 2.8mg / kg. If there is hexachlorobenzene in the soil, it will not only destroy the natural growth of vegetation, but also easily cause the deterio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
Inventor 王琪姜林刘辉姚珏君
Owner BEIJING MUNICIPAL RES INST OF ENVIRONMENT PROTECTION
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