A method for in-situ removal of arsenic from groundwater

A groundwater, in-situ technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as inability to operate for a long time, achieve significant environmental and social benefits, simple operation, The effect of low operating and administrative costs

Inactive Publication Date: 2012-02-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, some studies have used zero-valent iron to construct PRB to remove arsenic, but similar to the adsorption exchange method, the same precipitation and saturated adsorption problems make it unable to operate for a long time

Method used

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  • A method for in-situ removal of arsenic from groundwater
  • A method for in-situ removal of arsenic from groundwater

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Embodiment Construction

[0023] The specific implementation cases are listed below to further illustrate the present invention, and it should be understood that the implementation cases are not intended to limit the protection scope of the present invention.

[0024] A method for removing arsenic in situ from groundwater, comprising the steps of:

[0025] 1) In the surface area containing arsenic in groundwater, a place in Shanyin County, Shanxi Province was selected as the experimental base, which is one of the most serious drinking water arsenic poisoning areas in the whole province. According to on-site testing, the arsenic content in the groundwater at a depth of 19 meters here is as high as 1700 μg / L. Long-term drinking of the water in this aquifer has brought extremely serious effects on the health of local residents.

[0026] By injecting ferrous chloride and oxygen into the groundwater aquifer (sand layer) to increase the oxygen content in the groundwater and the concentration of iron in the g...

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Abstract

The invention relates to a method for removing arsenic in situ from ground water. A method for in-situ removal of arsenic from groundwater is characterized in that it comprises the following steps: 1) setting pumping wells in the surface area containing arsenic in the groundwater, arranging liquid injection and gas injection wells around the pumping wells, aerating the aeration device The gas head is arranged at the bottom of the liquid injection and gas injection wells; 2) pump out all the well water in the pumping wells and liquid injection and gas injection wells, then inject ferrous chloride solution into the liquid injection and gas injection wells, and then inject Water is injected into the liquid injection and gas injection wells until the water surface is equal to the ground; after the water injection into the liquid injection and gas injection wells is completed, the pumping well starts to pump water; 3) the injection of ferrous chloride solution and the injection of air are carried out at intervals; 4) when pumping When the content of arsenic ions in the groundwater extracted from the well is stable at ≤ 10 μg / L, and the content of chloride ions does not exceed the standard, stop injecting ferrous chloride solution and injecting air. The method has the characteristics of low cost and significantly reduced arsenic content in groundwater after treatment.

Description

technical field [0001] The invention belongs to the technical field of in-situ treatment of arsenic-containing groundwater, and in particular relates to a method for in-situ arsenic removal from groundwater. Background technique [0002] Among environmental chemical pollutants, arsenic is one of the most common and most harmful pollutants that cause cancer in the current environment. There are two forms of arsenic in groundwater: trivalent (As(III)) and pentavalent (As(V)), among which As(III) trivalent arsenic is more toxic, easy to accumulate in the body, and is mainly excreted slowly through the gastrointestinal tract ; while pentavalent arsenic is relatively less toxic, with a low tendency to accumulate, and is mainly excreted quickly through the kidneys. Due to the accumulation of arsenic in the human body, the diseases caused are difficult to cure. So the long-term effects of drinking groundwater high in arsenic are dire and can cause serious and irreversible damage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58
Inventor 李义连邓天天陈银松梁艳燕
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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