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In-situ chemical oxidation repairing method for organic matter contaminated groundwater

A technology of in-situ chemical oxidation and restoration method, applied in the field of groundwater restoration, can solve the problem of low oxidation efficiency of chemicals, and achieve the effects of saving cost, reducing dosage and improving removal efficiency.

Active Publication Date: 2018-05-18
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the current in-situ chemical oxidation restoration of organic polluted groundwater, the oxidation efficiency of agents is not high, the present invention provides an in-situ chemical oxidation restoration method of organic polluted groundwater

Method used

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Examples

Experimental program
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Effect test

Embodiment example 1

[0031] The in-situ chemical oxidation process of groundwater was simulated in the groundwater remediation simulation tank in the laboratory. 20L of groundwater contaminated with benzene and 1,2-dichloroethylene was prepared and added to the simulation tank filled with sand. The concentration of benzene in the groundwater was about 26mg / l, 1 , The concentration of 2-dichloroethylene is about 5.6mg / l, and the pH value is about 6.5.

[0032] Preparation A solution is 20mmol / L sodium ferrate, 2mmol / L potassium hydroxide, 0.5mmol / L potassium iodate; preparation B solution is 4mmol / L potassium oxalate; C solution is 15% hydrogen peroxide.

[0033] First inject 1L of solution A through the injection well set in the simulated tank, inject 0.5L of solution B after 6 hours of curing, and inject 2L of solution C after 3 hours of curing. After curing for 24 hours, take samples to measure the content of benzene and 1,2-dichloroethylene. The removal rate of benzene can reach 82.7%, and the ...

Embodiment example 2

[0035] The groundwater pollution area of ​​a pesticide factory is about 4000m 2 , the thickness of the aquifer is about 10m, and the soil porosity of the saturated aquifer is 46%. The average concentrations of benzene, 2-chlorotoluene, 4-chlorotoluene and chloroform in the area were 2081 μg / L, 1732 μg / L, 3366 μg / L and 105 μg / L, respectively. Before the in-situ chemical oxidation injection, 40 groundwater in-situ injection wells arranged in a systematic grid were established in the region. Prepare solution A containing 10mmol / L potassium ferrate, 1mmol / L sodium hydroxide and 1mmol / L potassium iodide solution, and inject 2m of this solution into each well 3 . After 8 hours of reaction, inject B solution containing 3mmol / L sodium citrate into each well, and inject 1m of this solution into each well. 3 , after 4 hours of reaction, inject 7% hydrogen peroxide solution 8m into each well 3 , reacted for 12 hours, and sampled and measured the concentration of organic pollutants af...

Embodiment example 3

[0037] The groundwater pollution area of ​​a pesticide factory is about 3500m 2 , the thickness of the aquifer is about 6m, and the soil porosity of the saturated aquifer is 42%. The average concentrations of chloroform, carbon tetrachloride, 1,2-dichloroethane, trichloroethylene, and 1,2,4-trichlorobenzene in the area are 4210μg / L, 8094μg / L, 2279μg / L, and 329μg, respectively / L and 1536 μg / L. Before the in-situ chemical oxidation injection, 100 injection points arranged in a systematic grid were established in the area, and a movable direct-push drug injection device was used for injection. Prepare solution A containing 20mmol / L potassium ferrate, 2mmol / L sodium hydroxide, 1mmol / L potassium iodide and 1mmol / L copper chloride solution, and inject 1.5m of the solution at each point 3 . After 18 hours of reaction, inject B solution containing 5mmol / L sodium oxalate into each well, and inject 0.5m of this solution into each well. 3 , after 6 hours of reaction, inject 8% hydro...

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Abstract

The invention discloses an in-situ chemical oxidation repairing method for organic matter contaminated groundwater. The method comprises the following steps of injecting a solution A into the organicmatter contaminated groundwater for maintenance for 6-18 hours, then injecting a solution B for maintenance for 2-6 hours, finally injecting a solution C for maintenance for 12-24 hours, and circularly repeating the steps above till groundwater contaminant detection satisfies standards; the solution A is a mixed solution of ferrate, an alkaline solution and a stabilizer; the solution B is a complexing agent aqueous solution; the solution C is hydrogen peroxide diluted with water. According to the method, ferrate is used for pre-oxidizing and encapsulating non-soluble reducing substances in a precipitation part to reduce the content of pollutants and reducing substances in the groundwater, and meanwhile ferrate provides iron ions for hydrogen peroxide to achieve a catalytic oxidation reaction, so that the effect of efficient removal of the organic pollutants is achieved. By applying the chemical method to in-situ chemical oxidation of the groundwater, a better oxidation effect can be achieved.

Description

technical field [0001] The invention relates to a restoration method for polluted groundwater, in particular to an in-situ chemical oxidation treatment method for organically polluted groundwater, and belongs to the technical field of groundwater restoration. Background technique [0002] With the rapid development of economy and society, the optimization of industrial structure, the transformation of urban functional areas and the adjustment of urban layout, a large number of chemical enterprises have changed production and moved out of the central area of ​​the city one after another, leaving behind a large number of polluted industrial sites, many of which exist The problem of organic pollution. Common organic pollutants include benzene series (BTEX), chlorinated hydrocarbons, phenols, nitroaromatics, etc. Due to the moderate solubility of these organic pollutants, they can migrate and diffuse with the groundwater flow, thus causing long-term harm and negative impact on ...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/52C02F103/06C02F101/30
CPCC02F1/5236C02F1/722C02F1/725C02F2101/30C02F2103/06C02F2305/023
Inventor 张弛钟重冯一舰孙璐胡正峰杨晓丹
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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