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Degradation reinforcing method for polychlorinated biphenyl in soil or sediment

A polychlorinated biphenyl and sediment technology, applied in the field of soil or sediment remediation, to achieve the effect of improving the degradation rate

Active Publication Date: 2016-08-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the pollution of PCBs mostly occurs in soil / sediment, although high-temperature incineration methods, thermal desorption methods, catalytic hydrogenation methods, advanced oxidation methods, and surfactant elution methods have been developed to repair PCBs. methods, but only microbiological techniques can achieve in-situ contamination remediation

Method used

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  • Degradation reinforcing method for polychlorinated biphenyl in soil or sediment

Examples

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Effect test

Embodiment 1

[0028] The method for strengthening the degradation of polychlorinated biphenyls in the soil under the participation of PCB61 of this embodiment is specifically:

[0029] Take an appropriate amount of PCBs-contaminated soil sample and add it to a serum bottle, add nutrient solution and PCB61 to it to form a uniform mud-water mixed culture solution with a mud-water volume ratio of 1:2.5; continuously blow nitrogen for 3 minutes to cause anaerobic state An aluminum foil cover with a vinyl fluoride gasket seals it. Add 10 mL of electron donor per liter of culture medium every month. Complete the intensified process for PCB-contaminated soil / sediment bioremediation.

[0030] The amount of PCB61 added is: 100mg per kilogram of mud-water mixed culture solution.

[0031] In the present embodiment, each liter of the nutrient solution contains: NaHCO 3 , 1.68g; NH 4 Cl, 2.7g; MgCl 2 ·6H 2 O, 0.1g; CaCl 2· 2H 2 O, 0.1g; FeCl 2 4H 2 O, 0.02g; K 2 HPO 4 , 0.27g; KH 2 PO 4 , ...

Embodiment 2

[0040] The method for strengthening the degradation of polychlorinated biphenyls in the soil under the participation of pentachloronitrobenzene of the present embodiment, except that 100 mg of pentachloronitrobenzene is added per kilogram of mud-water mixed culture solution, other features are the same as in Example 1.

[0041] Take regular samples, extract the PCBs in the mud-water mixture, and calculate the degradation rate. The results are as follows: figure 2 shown. Depend on figure 2 It can be seen that within one year of the beginning of the reaction, the changes of several samples were not significant, and after one year, especially after 18 months, the content of PCBs in the samples added with pentachloronitrobenzene began to be more obvious than that in the blank control samples decreased, indicating that the degradation of the PCB was promoted.

Embodiment 3

[0043] In the method for strengthening the degradation of polychlorinated biphenyls in soil with the participation of 4,4'-dibromobenzene in this example, except that 100 mg of 4,4'-dibromobenzene is added per kilogram of mud-water mixed culture solution, other characteristics are the same as those in Example 1 same.

[0044] Take regular samples, extract the PCBs in the mud-water mixture, and calculate the degradation rate. The results are as follows: image 3 shown. Depend on image 3 It can be seen that within 20 months of the beginning of the reaction, the changes of several samples were not significant, and the content of PCBs in the sample added with 4,4'-dibromobenzene began to decrease significantly after 2 years compared with the blank control sample, indicating that Promote the degradation of PCB.

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Abstract

The invention discloses a degradation reinforcing method for polychlorinated biphenyl in soil or sediment. A nutrient solution and a co-metabolism carbon source are added into the soil or sediment containing the polychlorinated biphenyl, a uniform mud and water mixed culture solution with the volume ratio of mud to water being 1:(2-3) is formed and reacts for one year or more under an anaerobic condition, and electron donors are added every month. The co-metabolism carbon source is PCB61 or quintozene or 4,4'-dibromo-benzene. The degradation reinforcing method for polychlorinated biphenyl in soil or sediment is green and environmentally friendly, and greatly improves the degradation efficiency of the polychlorinated biphenyl.

Description

technical field [0001] The invention relates to the technical field of soil or sediment remediation, in particular to a method for strengthening the degradation of polychlorinated biphenyls in soil or sediment. Background technique [0002] Polychlorinated biphenyls (PCBs for short) is a synthetic organochlorine compound with the characteristics of semi-volatility, persistence and persistence, including 209 homologues. The hydrophobicity and low water solubility of PCBs make them easily adsorbed in soil, sediment, and silt. Once discharged into the environment, PCBs persist for a long time and accumulate in organisms. From 1929 to 1978, PCBs were mass-produced and widely used, mainly for transformers, hydraulic oil, dyes, inks and other industrial products, and hundreds of millions of kilograms of PCBs were discharged into the environment. Although PCBs are no longer produced in the United States, their products, such as power transformers, are still widely used. PCBs are ...

Claims

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Application Information

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IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/085B09C1/10
Inventor 任源陈少毅李娜娜韦朝海
Owner SOUTH CHINA UNIV OF TECH
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