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Treatment method of carbon dioxide

A carbon dioxide, chemical treatment technology, applied in the direction of neutralizing water/sewage treatment, etc., can solve the problems of increasing electrical conductivity, unable to reduce the temporary hardness of wastewater, etc.

Inactive Publication Date: 2010-09-29
LINDE AG
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  • Abstract
  • Description
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Problems solved by technology

This method does not reduce the temporary hardness of the wastewater, but increases the concentration of sulfate or chloride ions and the conductivity of the water depending on the acid used

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Embodiment Construction

[0011] The present invention provides an improved method of lowering the pH of wastewater during chemical treatment of wastewater, the improvement comprising introducing carbon dioxide into the wastewater. The chemical treatment involves the introduction of chemical agents in the wastewater. The chemical agent is selected from the group consisting of flocculants, flocculation-supporting reagents, corrosion inhibitors and scale inhibitors.

[0012] Carbon dioxide is introduced into wastewater either before or after chemical treatment. Carbon dioxide can be introduced into wastewater at one location or at multiple locations. When the pH of the wastewater is greater than 8, carbon dioxide can be introduced into the wastewater undergoing chemical treatment. The introduction of carbon dioxide also reduces the temporary hardness of the wastewater.

[0013] The wastewater is usually from iron and steel production plants, and the wastewater can be selected from the following group:...

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Abstract

The invention provides a method for lowering pH of chemically treated waste water by injecting carbon dioxide, especially waste water from steel and iron manufacturing plants. The carbon dioxide is injected at different stages in the waste water chemical treatment process so as to lower the pH of the waste water and reduce the temporary hardness thereof, which makes the waste water be recycled or discharged conveniently.

Description

technical field [0001] The present invention relates to the treatment of alkaline wastewater in production plants such as iron and steel plants by injecting carbon dioxide at different stages of the wastewater chemical treatment process. Background technique [0002] The pH of wastewater streams in steel production plants is usually around 9, but often exceeds 12. While good production operations are possible at this pH, the pH must be lowered to comply with environmental and other regulations when wastewater is reused or discharged from the plant. Most water treatment plants require the pH of the effluent to be maintained at 6-9 and must further comply with lower hardness process and regulatory requirements. [0003] One traditional method of lowering the pH of wastewater is to treat the wastewater with an acid such as sulfuric acid or hydrochloric acid. This method does not reduce the temporary hardness of the wastewater, but increases the concentration of sulfate or chl...

Claims

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Application Information

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IPC IPC(8): C02F1/66
Inventor 修国华邓云辉吕亚平S·杜尔斯坦应宝华
Owner LINDE AG
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