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Method for polluted groundwater remediation by using in-situ construction of nanometer ferrous sulfide reaction zone

A ferrous sulfide and groundwater technology, applied in the restoration of polluted soil, etc., can solve the problems of limiting pollutant removal capacity and reducing specific surface area, achieving low maintenance cost, good migration effect, and guaranteed removal effect.

Active Publication Date: 2019-02-01
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, ferrous sulfide particles are prone to agglomeration in the environment, which reduces its specific surface area, and ferrous sulfide is easily oxidized to ferric iron in the underground environment, which limits its ability to remove pollutants

Method used

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  • Method for polluted groundwater remediation by using in-situ construction of nanometer ferrous sulfide reaction zone
  • Method for polluted groundwater remediation by using in-situ construction of nanometer ferrous sulfide reaction zone
  • Method for polluted groundwater remediation by using in-situ construction of nanometer ferrous sulfide reaction zone

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preparation example Construction

[0027] A, the preparation of reducing reagent solution and iron source reagent solution:

[0028] Prepare a reducing agent solution by dissolving 5%-10% reducing agent in 90%-95% deionized water in terms of mass percentage;

[0029] In terms of mass percentage, 5%-10% iron source reagent and 2%-8% dithionite are dissolved in 82%-93% deionized to prepare iron source reagent solution;

[0030] B. In the polluted groundwater area, the groundwater near the pollution source flows to the upstream position, and at least one pair of reagent injection wells 1 are drilled vertically along the groundwater flow direction. The distance between injection well A and injection well B in each pair of injection wells 1 is 1-2m. At least one observation well 3 is drilled 3-5m downstream of the injection well 1, and the well depths of the injection well 1 and the observation well 3 reach the bottom of the aquifer; mesh;

[0031] C. First inject the reducing reagent solution prepared in step A i...

Embodiment 1

[0037] In the transparent simulation tank filled with fine sand medium, two reagent injection wells (A, B) are drilled vertically along the groundwater flow direction with a distance of 0.3m, and the injection wells are as deep as the aquifer. The size of the simulated tank is 500×330×30 (mm), and the size of the fine sand is 0.09-0.15mm.

[0038] Dissolve 105-210g of sodium sulfide in 2L of deionized water to prepare a sodium sulfide solution; dissolve 100-250g of ferrous sulfate and 40-200g of dithionite in 2L of deionized water to prepare a mixed solution of iron sources.

[0039] Inject the prepared sodium sulfide solution into injection well A first, and inject the prepared iron source mixed solution into injection well B after 1 min; inject sodium sulfide intermittently at equal intervals in the order of injection into well A first and then into well B Solution and iron source mixed solution, and pulse perfusion is used for perfusion. In the mode of intermittent injecti...

Embodiment 2

[0043] In the transparent simulation tank filled with coarse sand medium, two reagent injection wells (A, B) are drilled vertically along the groundwater flow direction with a distance of 0.3m, and the injection wells are as deep as the aquifer. The size of the simulation tank is 500×330×30 (mm), and the size of coarse sand particles is 0.4-0.8mm.

[0044] Dissolve 105-210g of sodium sulfide in 2L of deionized water to prepare a sodium sulfide solution; dissolve 100-250g of ferrous sulfate and 40-200g of dithionite in 2L of deionized water to prepare a mixed solution of iron sources.

[0045] Inject the prepared sodium sulfide solution into injection well A first, and inject the prepared iron source mixed solution into injection well B after 1 min; inject sodium sulfide intermittently at equal intervals in the order of injection into well A first and then into well B Solution and iron source mixed solution, and pulse perfusion is used for perfusion. In the mode of intermitten...

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Abstract

The invention relates to a method for polluted groundwater remediation by using in-situ construction of a nanometer ferrous sulfide reaction zone. The method is characterized in that one or more of injection well pairs are formed in the vicinity of a pollution source in the flowing direction of underground water, one or more observation wells are arranged at the downstream of the injection wells,a sodium sulfide solution, and a mixed solution of ferrous sulfate and sodium hydrosulfite are correspondingly injected into the injection well pairs in an intermittent manner, and after injection, pouring is stopped when it is monitored that the content of ferrous iron changes into the expected content through the observation wells. The two kinds of injectant solutions have certain mobility in the underground, a redox reaction can be generated underground, and the iron ore environment with nanometer ferrous sulfide as a main product is formed. The nanometer ferrous sulfide is spontaneously formed underground, has good mobility, and cannot cause medium blockage to influence the permeability coefficient, sodium hydrosulfite can be used for effectively ensuring the underground anaerobic reduction condition so that a bivalent iron reaction zone can stably exist, the reaction zone can be used for rapidly and efficiently removing pollutants, secondary pollution is avoided, the cost is low,operation and maintenance are convenient, and therefore, the method is suitable for remediation of various types of polluted sites.

Description

technical field [0001] The invention relates to a method for constructing a reaction zone in situ to restore polluted groundwater, more specifically, the invention relates to a method for constructing a reaction zone of nanometer ferrous sulfide in situ to repair polluted groundwater. Background technique [0002] In situ reactive zone remediation is based on the artificial creation of a "zone" in the subsurface environment in which migrating pollutants are trapped, immobilized, or degraded into harmless substances. By injecting chemical reactants, a permeable pollutant treatment zone is formed underground. In the reaction zone, the pollutants in the underground environment are intercepted and permanently fixed in the reaction zone in one way, and the other way is that the groundwater pollutants react chemically with the injected chemical reagents to achieve removal. [0003] There is a related preparation method of ferrous sulfide. Chinese patent CN104030365A discloses tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/002B09C2101/00
Inventor 刘娜王若凡杨亚冬丁隆真
Owner JILIN UNIV
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