Method for renovating groundwater in situ with chemical and biological composite reaction wall

A technology of combined reaction and chemical reaction, applied in chemical instruments and methods, biological water/sewage treatment, contaminated groundwater/leachate treatment, etc.

Inactive Publication Date: 2008-05-07
JILIN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

But it also has some limitations: ① When the non-aqueous solution appears, it is almost impossible to remove the non-aqueous solution due to capillary tension by pumping; ② The technology is expensive for excavation and treatment, and It involves the extraction or recharge of groundwater, which greatly interferes with the restoration area; ③If the pollution source is not closed, when the pumping is stopped, the phenomenon of tailing and rebound will be serious; ④Continuous energy supply is required to ensure the pumping of groundwater and the maintenance of the water treatment system operation, but also requires regular maintenance and monitoring of the system
Because of its certain solubility in water, high boiling point, and slow evaporation rate under natural conditions, it is difficult for the above-mentioned prior art to effectively repair the groundwater polluted by nitrobenzene and aniline.

Method used

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  • Method for renovating groundwater in situ with chemical and biological composite reaction wall

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Experimental program
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Effect test

Embodiment 1

[0041] The combined reaction wall includes a chemical reaction wall 2 with a thickness of 50 cm in the upstream of the groundwater flow, and a biological reaction wall 4 with a thickness of 30 cm in the downstream of the chemical reaction wall 2 at 50 cm.

[0042] The screening and domestication of nitrobenzene-degrading bacteria and aniline-degrading bacteria include the following methods and steps:

[0043] a, the screening of bacterial classification, get two parts of chemical plant blowdown outlet bottom mud, each 10ml, place respectively in the 250ml Erlenmeyer flask that glass beads and 90ml distilled water are housed, after oscillating and aerating 24 hours in 10°C constant temperature oscillator, Take 10ml of each and inoculate them in the culture solution containing aniline or nitrobenzene, and then culture for 48 hours to obtain the strains of aniline or nitrobenzene;

[0044] b. Domestication of aniline-degrading bacteria, put the strains in a 250ml Erlenmeyer flask...

Embodiment 2

[0068] Dig a deep ditch 30 cm wide in the upstream of the groundwater flow direction, and the depth reaches the underground water-resisting layer, mix zero-valent iron and activated carbon in a ratio of 5:1, and fill it in after mixing, which is the chemical reaction wall 2. The original concentration of nitrobenzene was 300.87 mg / L, and nitrobenzene was not detected until the 10th day after running through the chemical reaction wall, which indicated that nitrobenzene had been completely reduced by zero-valent iron and adsorbed by activated carbon within 10 days. As time increases, the concentration of nitrobenzene increases slightly, which shows that the adsorption of activated carbon in the iron-carbon layer has reached saturation, and the reducing performance of iron has decreased, so nitrobenzene appears, and nitrobenzene reaches 1.4mg / L-1.6mg / L. Experiments have proved that the conversion rate of p-nitrobenzene in the chemical reaction wall is 99%.

[0069] At the downst...

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Abstract

The invention discloses a method for treating underground sewage, in particular for the underground water which is polluted by nitrobenzene and aniline. The original restoration of the underground water with chemical and biological combination reaction wall is adopted in the method. The upper reach of the flowing underground water is provided with a chemical reaction wall, and a biological reaction wall is arranged below the chemical reaction wall with a certain distance away. The chemical reaction wall consists of nonvalent ferrum and active carbon at a certain proportion, and the biological reaction wall consists of the attached nitrobenzene degradation bacteria and the attached aniline degradation bacteria biological active carbon. The nitrobenzene is reduced to be the degradable nitrobenzene through the chemical reaction wall, and the nonvalent ferrum is good in the removal of the nitrobenzene organism which is difficult in degradation, so the chemical reaction wall has good applicability and can achieve 120-minute reaction time and the 97.4 percent of the reduction rate for the nitrobenzene. The production of the biological reaction wall with the biological active carbon is good in the removal of the target pollutant. The work of the biological reaction wall for 36 days can achieve more than 98.83 percent of the degradation rate for the nitrobenzene with the preliminary density of 300.89mg/L, and the work of the biological reaction wall for 71 days can achieve more than 99.6 percent of degradation rate.

Description

technical field [0001] The invention relates to a treatment method for groundwater pollution, in particular to a method for in-situ restoration of groundwater polluted by nitrobenzene and aniline through a chemical and biological combination type reverse wall. Background technique [0002] At present, there are many kinds of groundwater pollution control technologies and restoration schemes, which can be summarized as follows: physical method, chemical method, and biological method; according to the treatment characteristics, the bioremediation method can be divided into ex-situ bioremediation method and in-situ bioremediation method and combined bioremediation. [0003] Physical method: The extraction treatment method is a traditional ex-situ remediation technology that is widely used at present. This technology is one of the earliest groundwater pollution remediation technologies, and it is also a representative technology of groundwater ex-situ remediation. Since groundw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/34C02F1/70C02F103/06
Inventor 张兰英刘娜赵勇胜高松张玉玲孙立波
Owner JILIN UNIV
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