Technique of in-situ remediation of high As groundwater

An in-situ restoration and groundwater technology, which is applied in the field of water treatment, can solve the problems of less application projects, and achieve the effects of low operation and management costs, low investment, and simple operation

Inactive Publication Date: 2010-09-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although in situ remediation is a popular technology, very little research has been done on in situ treatment of arsenic-rich groundwater, and even less applied engineering

Method used

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  • Technique of in-situ remediation of high As groundwater
  • Technique of in-situ remediation of high As groundwater
  • Technique of in-situ remediation of high As groundwater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The results of investigation and research show that the main hydrochemical characteristics of high-arsenic groundwater are high pH (generally greater than 8.0), low redox potential, high concentrations of humic acid, hydrogen sulfide, and methane, and low concentrations of sulfate and nitrate. High arsenic groundwater is in reducing environment. At the same time, areas with high arsenic groundwater are mostly in arid-semi-arid climate conditions. Due to the requirements of groundwater extraction, residents mostly use groundwater in confined aquifers, and groundwater in this layer has high arsenic characteristics. Therefore, in-situ treatment of high-arsenic groundwater is mostly groundwater in confined aquifers. This example takes the treatment of high-arsenic groundwater in underground confined aquifers in a small area of ​​a village in Shanyin County, Shanxi as an example, and the specific steps are as follows:

[0033] 1) Carry out geological drilling in the work are...

Embodiment 2

[0047] A technique for in-situ remediation of high-arsenic groundwater, comprising the steps of:

[0048] 1) Carry out geological drilling in the work area to be treated, obtain accurate geological data, and determine the location of the water intake aquifer;

[0049] 2) Carry out on-site hydrogeological tests to determine the hydrogeological parameters of the water intake aquifer (such as: the permeability coefficient of the water intake aquifer, the water supply degree of the water intake aquifer, etc.);

[0050] Dispersibility of ferrous chloride in abstracted aquifers:

[0051] In situ treatment of high arsenic groundwater To treat groundwater in confined aquifers, ferrous chloride solution is injected into the confined aquifer. The ferrous chloride solution is a two-dimensional dispersion problem in the confined aquifer, and the concentration c is continuously injected into the aquifer at the rate q0 of ferrous chloride solution, set the concentration c at the injection ...

Embodiment 3

[0062] A technique for in-situ remediation of high-arsenic groundwater, comprising the steps of:

[0063] 1) Carry out geological drilling in the work area to be treated, obtain accurate geological data, and determine the location of the water intake aquifer;

[0064] 2) Carry out on-site hydrogeological tests to determine the hydrogeological parameters of the water intake aquifer (such as: the permeability coefficient of the water intake aquifer, the water supply degree of the water intake aquifer, etc.);

[0065] The dispersibility of ferrous chloride in the abstracted aquifer is the same as calculated in Example 2:

[0066] 3) When the area of ​​the work area to be processed is greater than 1,000,000m 2 When (that is, when the arsenic in the entire high-arsenic area or a certain aquifer in the basin is fixed in situ): along the direction of groundwater flow, with the center of the work area to be treated as the reference point, the liquid injection wells and gas injection ...

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Abstract

The invention belongs to the technical field of water treatment and particularly relates to a technique for in-situ remediation of high As groundwater, which is characterized in that the technique comprises the steps of: 1) conducting geological drilling at the working area, acquiring the accurate geological data and determining the position of the aquiclude from which water is taken; 2) conducting hydrogeological test and acquiring relevant parameters; 3) symmetrically arranging a liquid injection well and a gas injection well around a water pumping well or the center of the working area; 4) injecting ferrous chloride solution to the aquiclude from which water is taken through the liquid injection well and injecting oxygen to the aquiclude from which water is taken through the gas injection well; and 5) surveying the contents of As ions, iron ions, chloridions and dissolved oxygen, and when the content of As ions is less than or equal to 10 microgram/L and remains constant and neither of the contents of the iron ions and the chloridions exceeds the standard, stopping injecting ferrous chloride solution and oxygen. The method has the advantages of simple operation, low cost and good processing effect.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a process for in-situ restoration of high-arsenic groundwater. Background technique [0002] Arsenic is a highly viral element in water and can cause serious harm to human health. The content of arsenic in surface water bodies is relatively low, but most of the excessive arsenic content occurs in groundwater. According to incomplete statistics, the world's high-arsenic groundwater is distributed in 22 countries and regions including the western United States, Chile, Hungary, China, and Bangladesh, among which Bangladesh, India, and China in Asia are the most serious. The harm caused by high arsenic groundwater to human health has attracted worldwide attention and is a public problem that needs to be solved urgently. However, there are still technical and economic problems in the current arsenic removal technology, and there are few engineering applications. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 李义连陈银松邓天天梁艳燕
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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