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Method of in situ restoration of contaminated groundwater

A groundwater and groundwater pollution technology, which is applied in the direction of contaminated groundwater/leachate treatment, reduced water/sewage treatment, chemical instruments and methods, etc., can solve problems not involved in the field of groundwater pollution restoration, and achieve rapid and fast response Efficient effect

Active Publication Date: 2020-06-16
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most technologies are still limited to the application in the field of traditional water treatment, and do not involve the field of groundwater pollution remediation

Method used

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  • Method of in situ restoration of contaminated groundwater
  • Method of in situ restoration of contaminated groundwater
  • Method of in situ restoration of contaminated groundwater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Repair effect of Cr(VI) in reaction zone during simulated repair of uniform sand aquifer

[0029] In the groundwater pollution area, according to the location of the pollutant leakage point and the direction of the groundwater flow, set the location and number of monitoring points, and conduct sampling and analysis in the polluted area. A total of 66 sampling ports (6 rows, 11 columns) are set, and the sampling port spacing is 2m. Name each sampling port. For example, the sampling ports in the first row and third column are named sampling ports 1-3, and the second row The sampling ports in the fifth column are named sampling ports 2-5, and the names of the remaining sampling ports can be deduced by analogy. Drill two reagent injection wells side by side between the third row of sampling ports and the fourth row of sampling ports. The inner diameter of the injection wells is 15cm, the spacing is 5m, and there are small holes evenly distributed around the body; sampling in t...

Embodiment 2

[0038] Repair effect of TCE in reaction zone during simulated repair of uniform sand aquifer

[0039] The difference from Example 1 is that the site medium is the same, but the target pollutant is trichloroethylene (TCE).

[0040] The repair effect of this new in-situ advanced reduction technology was investigated when groundwater was contaminated by TCE.

[0041] The experimental method and the test method of each index are the same as in Example 1. In addition, TCE is determined by extraction and enrichment method with n-hexane. Use gas chromatography-mass spectrometry, select ion scanning mode, and use external standard method to quantitatively analyze the content of TCE. The column is HP-5MS. The specific steps are as follows: Take out 5ml of liquid from the 20ml reaction system, add 5ml of extractant n-hexane, after liquid-liquid extraction with a vortex shaker, remove the upper extract, dilute and wait for computer analysis.

[0042] The result analysis shows that with the flo...

Embodiment 3

[0044] Repair effect of Cr(VI) and TCE in reaction zone during simulated repair of uniform sand aquifer

[0045] The difference from Example 1 is that the site medium conditions are the same, but the target pollutants are Cr(VI) and TCE.

[0046] The effect of this new in-situ advanced reduction technology was investigated when groundwater was contaminated by Cr(VI) and TCE at the same time.

[0047] The experimental method and the test method of each index are the same as in Example 1. In addition, TCE is determined by extraction and enrichment method with n-hexane. Use gas chromatography-mass spectrometry, select ion scanning mode, and use external standard method to quantitatively analyze the content of TCE. The column is HP-5MS. The specific steps are as follows: Take out 5ml of liquid from the 20ml reaction system, add 5ml of extractant n-hexane, after liquid-liquid extraction with a vortex shaker, remove the upper extract, dilute and wait for computer analysis.

[0048] Analys...

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Abstract

The invention relates to a method for in-situ reduction restoration of polluted groundwater. In a groundwater pollution zone, by injecting formate and persulfate into an underground environment through two injection wells and performing thermal activation on the persulfate and the formate, carbon dioxide ion free radicals with high reducibility are prepared to reduce heavy metals and chlorinated organic pollutants and remove target polluted components, so as to achieve an aim of restoration. According to the method provided by the invention, activation is realized by heating without externally adding transition metals, and the generation of free radicals and the removal of pollutants can be achieved under the condition that chemical conditions including a pH value, a dissolved oxygen content and the like of the groundwater are not adjusted. A carbon dioxide free radical is a high-reducibility free radical, reacts quickly and efficiently with the pollutants, and can be widely applied to restoration of underground polluted environments.

Description

Technical field [0001] The invention belongs to the technical field of groundwater pollution remediation, and relates to a groundwater pollution remediation method, in particular to a method for in-situ reduction and remediation of contaminated groundwater. The method uses the strong reducibility of carbon dioxide free radicals to remove heavy metals and organic matter polluted groundwater Bit repair. Background technique [0002] In the development process of human civilization, industrial production and mining activities generate a large amount of solid waste and polluted wastewater. Random disposal or improper treatment of them will cause serious pollution of soil and groundwater, thereby threatening people's health. [0003] With the rapid development of industry and agriculture, the problems of heavy metals and organic pollution in groundwater have become increasingly prominent, and their control and treatment have gradually become the focus of new environmental protection wor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F103/06
CPCC02F1/70C02F2103/06C02F2209/003
Inventor 周睿孙荷任何军侯志敏张立剑
Owner JILIN UNIV
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