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In-situ reinforced remediation method for chlorohydrocarbon-polluted underground water

A technology of in-situ strengthening and remediation methods, applied in the direction of contaminated groundwater/leachate treatment, chemical instruments and methods, water pollutants, etc., can solve the problem of uneven distribution of halogenated hydrocarbon pollution, low efficiency of biodegradation, and remediation The materials are easy to agglomerate and other problems, to achieve the effect of increasing microbial diversity and activity, fast removal speed, and complete degradation

Pending Publication Date: 2021-06-01
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the more commonly used repair materials include zero-valent iron and organic carbon sources, but these repair materials have problems such as easy agglomeration and oxidation, short action time, and low utilization efficiency.
In addition, pollutants are easily distributed in different geological aquifers. Generally, the circulation of biologically active substrates and zero-valent iron in groundwater is small, which leads to certain difficulties in injection.
Furthermore, in general polluted sites, the pollution distribution of halogenated hydrocarbons is not uniform, usually showing regional characteristics, and in low-concentration polluted soil, the biodegradation efficiency is very low, and it is difficult to have obvious remediation effect

Method used

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  • In-situ reinforced remediation method for chlorohydrocarbon-polluted underground water
  • In-situ reinforced remediation method for chlorohydrocarbon-polluted underground water
  • In-situ reinforced remediation method for chlorohydrocarbon-polluted underground water

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The present embodiment prepares a kind of nano colloidal activated carbon, concrete steps are as follows:

[0034] (1) The specific surface area is selected as 1050m 2 / g, 50 mg of coconut shell activated carbon with a particle size of 10 μm;

[0035] (2) Add the coconut shell activated carbon into the horizontal ball mill and grind it in the horizontal ball mill for 96 hours, so that the particle size range is 0.1-1.8 μm;

[0036] (3) Add 250mL of distilled water at 65°C to the ground activated carbon, put it into a high-pressure homogenizer, circulate and homogenize it for 10 times, the homogenization pressure is 80MPa, and cool it down to room temperature naturally to obtain nano colloidal activated carbon with a particle size of 50~ 150nm;

[0037] (4) Add 2.5mL, 5.0mL, 7.5mL, 12.5mL, 25mL, 37.5mL, 50mL, 62.5mL, 75mL of nano colloidal activated carbon into nine 500mL adsorption reaction flasks;

[0038] (5) Adding 500 mL of TCE water samples with a concentration of...

Embodiment 2

[0042] In this example, the nano colloidal activated carbon of Example 1 was used to prepare colloidal activated carbon-based composite bacteria. Specific steps are as follows:

[0043] (1) Preparation of inorganic medium: 1.650g NH 4 NO 3 , 1.9g KNO 3 , 0.440g CaCl 2 2H 2 O, 0.370gMgSO 4 ·7H 2 O, 170mg KH 2 PO 4 , 37.3 mg Na 2 - EDTA, 27.8mg FeSO 4 ·7H 2 O, 6.2 mg H 3 BO 3 , 22.3mgMnSO 4 4H 2 O, 8.6mg ZnSO 4 ·7H 2 O, 0.83mg KI, 0.25mg Na 2 MoO·2H 2 O, 0.025 mg CuSO 4 ·5H 2 O, 0.025 mg CoCl 2 ·6H 2 O was added to 1L deionized water, the pH value was adjusted to 7.0 with 0.1M NaOH solution, sterilized in a pressure cooker at a temperature of 121 °C for 20 minutes, and cooled in an ultra-clean bench to obtain an inorganic medium.

[0044] (2) Add 8 g of groundwater polluted by chlorinated hydrocarbons to the inorganic medium in step (1), at 30° C., under the condition of a rotating speed of 180 r / min, keep away from light, shake at a constant temperature, ...

Embodiment 3

[0049] For an industrial site, two chlorinated solvent pollution plumes were detected below it, and the main pollution factors were trichlorethylene and 1,2-dichloroethylene. Using the nano-colloid activated carbon-based composite bacterial solution prepared in Example 2 of the present invention, a direct-push injection system was used to remediate the groundwater of the polluted site.

[0050] The direct-push injection system includes a bacterial agent configuration system, a syringe pump system and a direct-push injection system. The bacterial agent configuration system transports the mixed bacterial agent to the bacterial agent barrel through a diaphragm pump, and then dissolves, dilutes and mixes the mixed bacterial agent through the bacterial agent mixer. Stirring configuration work; the injection pump system is powered by the hydraulic system of the drilling rig, pressurizes the mixed bacterial agent and pushes it into the pressure pipeline, and then pushes the injection ...

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Abstract

The invention discloses an in-situ reinforced remediation method for chlorohydrocarbon-polluted underground water. The method comprises the following steps: (1) investigating hydrogeological conditions and pollutant distribution conditions of a polluted site; (2) calculating the size of an underground water pollution plume, and delimiting a pollution area according to the size of the pollution plume; (3) preparing nano colloid activated carbon-based compound bacteria, and mixing the nano colloid activated carbon-based compound bacteria with water according to a ratio of (1:10)-(1:1000) to prepare a mixed bacterial agent; and (4) establishing injection points in each pollution area, pushing the mixed microbial agent to a target pollution layer through a direct push drilling machine injection system, and injecting the mixed microbial agent into each injection point in sequence under a certain pressure. The method is easy to operate, the injection depth can be greatly reduced, the injection cost is reduced, and the method has the advantages that the removal speed of chlorohydrocarbon in underground water is high, degradation is thorough, the repair period is shortened, and the adsorption and degradation capacity is reproducible.

Description

technical field [0001] The invention relates to the technical field of groundwater pollution restoration, in particular to a colloidal activated carbon composite bacteria in-situ enhanced groundwater restoration method capable of repairing pollution from different concentrations of chlorinated hydrocarbons. Background technique [0002] Chlorinated hydrocarbons (Chlorinated hydrocarbons, CHCs) are a class of volatile organic compounds with extremely strong "three-caused" toxic effects and bioaccumulation capabilities, represented by trichlorethylene, trichloroethane, and dichloroethane. It has been widely used in electronics, leather, dry cleaning and chemical industries, but due to improper storage and disposal, it is very easy to enter the water, air, soil and other surrounding environments through volatilization and leakage during the production process. Once it enters the underground environment , Chlorinated hydrocarbons are very prone to migration and diffusion, causin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F1/28C02F103/06C02F101/36
CPCC02F3/34C02F3/348C02F1/283C02F2103/06C02F2101/36
Inventor 王水尹业新辜建强张满成刘情蔡安娟
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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