Method for aerating separating and purifying weak acidic harmful gas dissolved in waste water

A harmful gas, weakly acidic technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as air pollution, air pollution in circulating water facility areas, and deterioration of washing and circulating water quality, and achieve the goal of reducing pollution Effect

Inactive Publication Date: 2008-04-09
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Harmful weak acid gases such as hydrogen sulfide dissolve in the washing circulating water, which will lead to the deterioration of the washing circulating water quality, and volatilize from the circulating water and water treatment facilities to cause air pollution
[0003] Coal gas and petroleum gas containing hydrogen sulfide will dissolve and absorb a certain amount of acid gas such as hydrogen sulfide during the washing process, resulting in deterioration of water quality and air pollution in the area of ​​circulating water facilities

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] As shown in the figure, the washing circulating water comes from the cooling and washing process of the gas double standpipe; the air used for aeration and other gases can be supplied by a centrifugal blower and a Roots blower; The weak acid gas such as hydrogen sulfide in the water is blown out; the circulating water that has been aerated to remove hydrogen sulfide continues to enter the sedimentation tank to remove suspended solids; the gas containing hydrogen sulfide from the aeration tank enters the activated carbon adsorption tower or wet absorption Purification tower for processing. The gas is evacuated directly after purification.

[0013] The contriver has done the hydrogen sulfide stripping test of the gas washing circulating water, and the research results show that

[0014] test type

pH

gas-liquid ratio

Hydrogen sulfide stripping rate (%)

small test

5.3～7.0

70

91.8 (average)

industrial test

6～7

...

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PUM

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Abstract

The invention provides an aerating method for separating and purifying weak acidic harmful gases dissolved in waste water. The method comprises aerating and purging weak acidic harmful gases such as hydrogen sulfide, etc. in circulating water or the waste water with air or other gases; gases stripped out via aeration are introduced into an activated carbon adsorption tower or a wet adsorption purification tower and emitted to the atmosphere after purification. The method belongs to a physical treatment method and the stripping separation rate can exceed 90 percent. Not only hydrogen sulfide can be effectively removed, but also the circulating water can be reused, so the invention does not have the problem that the quality of the circulating water can be deteriorated due to the increase of accumulative concentration of acids, alkali and salts produced in the treatment by drug administration method.

Description

technical field [0001] The invention relates to a method for treating wastewater by using aeration, in particular to a method for separating and purifying weakly acidic harmful gases dissolved in wastewater by aeration. Background technique [0002] Harmful weak acid gases such as hydrogen sulfide dissolve in the washing circulating water, which will lead to deterioration of the washing circulating water quality, and volatilize from the circulating water and water treatment facilities to cause air pollution. [0003] Coal gas and petroleum gas containing hydrogen sulfide will dissolve and absorb a certain amount of acid gas such as hydrogen sulfide during the washing process, resulting in deterioration of water quality and air pollution in the area of ​​circulating water facilities. Contents of the invention [0004] The purpose of the present invention is to provide a physical method to treat weakly acidic harmful gases in waste water, which not only avoids the deteriorat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/20C02F1/58B01D53/52
Inventor 胡黔生韦茂森张铁韬徐永炽王钰
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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