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In-situ arsenic removing method of underground water

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, low energy consumption, The effect of reducing exposure

Inactive Publication Date: 2010-09-15
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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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 an in-situ arsenic removing method of underground water, which is characterized by comprising the following steps of: (1) arranging a pumping well in an earth surface area containing arsenic in the underground water, arranging a liquid-injection and gas-injection well around the pumping well, and arranging an aeration head of an aeration device at the bottom inside the liquid-injection and gas-injection well; (2) firstly completely pumping well water inside the pumping well and the liquid-injection and gas-injection well, then injecting a ferrous chloride solution into the liquid-injection and gas-injection well, and then injecting the water into the liquid-injection and gas-injection well till the water surface aligns to the ground, and starting to pump the water by the pumping well after the water is completely injected into the liquid-injection and gas-injection well; (3) alternately injecting the ferrous chloride solution and air; and (4) stopping injecting the ferrous chloride solution and the air when the content of the arsenic contained in the underground water pumped by the pumping well is stabilized at a value less than or equal to 10 micrograms / L and the content of chloride ions does not exceed the standard. The in-situ arsenic removing method of underground water has low cost and obviously reduced content of the arsenic contained in the processed underground water.

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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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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