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Method for removing arsenic from underground water through in-situ construction of activated reaction zone

An active reaction and groundwater technology, applied in the field of environmental pollution control, can solve the problems of difficulty in uniform distribution and inconvenient large-scale use, and achieve the effects of avoiding uneven arsenic removal, simple method, and improving efficiency and scope

Inactive Publication Date: 2017-10-17
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not easy to distribute solid materials evenly when put into the underground formation or groundwater, or it needs to dig and build reaction wall fortifications, which is not convenient for large-scale use

Method used

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  • Method for removing arsenic from underground water through in-situ construction of activated reaction zone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Please refer to figure 1 , the embodiment of the present invention provides a method for removing arsenic from groundwater by constructing an active reaction zone in situ, comprising the following steps:

[0019] (1) Determine the arsenic valence state and concentration distribution of the formation to be repaired, and determine the diffusion radius of the formation to be repaired; calculate the maximum repair fluid injection volume per hole, injection parameters, and the heating radius of the heating well;

[0020] (2) Arrange the injection points of heating wells and repair fluids in the formation to be repaired, and determine the heating parameters of the injection parameters and the heating wells; refine the divisional positions of the heating wells and injection points, and optimize the injection parameters and the injection points according to the specific positions. Heating parameters of the heater well;

[0021] (3) injecting the repair fluid into the formation...

Embodiment 2

[0028] According to the method of Example 1, the restoration of the arsenic-contaminated groundwater area is simulated in the sealed small-scale soil column reactor, and the restoration solution potassium permanganate and ethylene glycol mixture is injected into the soil layer in the middle of the soil column, and the high manganese content is made by steam heating at the same time. Potassium acid and ethylene glycol fully react and transform into solid manganese oxides, forming an active reaction zone.

[0029] Wherein, the repair solution is 30mL, and the molar ratio of the potassium permanganate and ethylene glycol is 1:18; wherein, the addition of the potassium permanganate is 2mmol, and the addition of ethylene glycol is 36mmol ; Steam heating time is 1h, the temperature is 120 ℃.

[0030] Inject water into the soil column to saturation, and introduce nitrogen to simulate the anoxic environment of groundwater. The content of trivalent arsenic in the groundwater is 500 μg / ...

Embodiment 3

[0033] According to the method of Example 1, the restoration of the arsenic-contaminated groundwater area is simulated in the sealed soil column reactor, and the restoration liquid potassium permanganate and ethylene glycol mixture are injected into the soil layer in the middle of the soil column, and the potassium permanganate is made by steam heating at the same time. Fully react with ethylene glycol and transform into solid manganese oxide, forming an active reaction zone.

[0034] Wherein, the repair solution is 50mL, and the molar ratio of the potassium permanganate and ethylene glycol is 1:18; the addition of the potassium permanganate is 2mmol, and the addition of ethylene glycol is 36mmol; The dosage of iron oxide is 2mmol. All the other are with embodiment two.

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Abstract

The invention discloses a method for removing arsenic from underground water through in-situ construction of an activated reaction zone. A mixed solution of permanganate and a stabilizer is added to a to-be-repaired stratum; the permanganate reacts with the stabilizer to construct an in-situ activated reaction zone under a heating condition; trivalent arsenic in arsenic-contaminated underground water when flowing through the activated reaction zone is oxidized into pentavalent arsenic and stabilized and solidified into soil, thereby achieving the underground water detoxification function. The method is simple, convenient and easy to operate, and the cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and in particular relates to a method for removing arsenic in groundwater by constructing an active reaction zone in situ. Background technique [0002] Arsenic pollution in groundwater is currently a serious worldwide environmental pollution problem. According to statistics, more than 50 million people in at least 22 countries and regions around the world are facing the threat of drinking water safety caused by arsenic pollution in groundwater. my country's Inner Mongolia Hetao Plain and other areas are typical arsenic-polluted areas, and the threatened population in this area is as high as more than 300,000. [0003] Arsenic exists mainly in trivalent and pentavalent forms in groundwater, and mainly exists in the form of pentavalent arsenic As(V) in anoxic groundwater. For the human body, the toxicity of trivalent arsenate As(III) is far greater than that of pentavalen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08C02F1/72C02F101/20
CPCB09C1/002B09C1/08B09C2101/00C02F1/72C02F2101/20
Inventor 杜江坤
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)