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Process for reducing hardness of waste water by using carbon dioxide-containing waste gas

A carbon dioxide and waste water technology, applied in water softening, water treatment parameter control, chemical instruments and methods, etc., can solve problems such as increasing treatment costs

Pending Publication Date: 2021-08-20
陕西大河净化科技有限公司
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Problems solved by technology

Sodium carbonate needs to be purchased separately which increases disposal costs

Method used

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  • Process for reducing hardness of waste water by using carbon dioxide-containing waste gas

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Embodiment 1

[0022] A process for reducing the hardness of waste water with carbon dioxide-containing waste gas, comprising the following steps:

[0023] 1) pH adjustment, sending the wastewater into the mixed wastewater adjustment tank, adding sodium hydroxide to adjust the pH of the wastewater to 11-12;

[0024] 2) The carbon dioxide hardness reduction reaction removes the hardness of the wastewater. The wastewater adjusted in step 1) is sent into the carbon dioxide mixer through a pressurized pump. The reaction is carried out in the pressurized mixing microreactor, and then the waste water flows out from the pressurized mixing microreactor and flows into the filter for filtration. device;

[0025] 3) Filtration, send the effluent of the filter in step 2) into the buffer pool, then into the DH membrane filter, and send the clear liquid obtained after filtering through the DH membrane filter into the clear liquid pool, and send it into the clear liquid pool through the clear liquid pool ...

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Abstract

The invention discloses a process for reducing hardness of waste water by using carbon dioxide-containing waste gas. The process comprises the steps of 1) adjusting pH; 2) performing carbon dioxide hardness reduction reaction to remove the hardness of the wastewater; 3) filtering; 4) conducting filter pressing; and 5) cleaning. The invention belongs to the technical field of wastewater hardness reduction, and particularly relates to a process for reducing wastewater hardness by carbon dioxide-containing waste gas, which is simple in flow and capable of reducing acid consumption and sodium ion introduction.

Description

technical field [0001] The invention belongs to the technical field of reducing the hardness of wastewater, and specifically refers to a process for reducing the hardness of wastewater by waste gas containing carbon dioxide. Background technique [0002] At present, in the industrial field, a large amount of acidic wastewater will be generated in the production process of some industries. During the treatment of this part of the wastewater, calcium hydroxide should be added to adjust the pH value of the wastewater to neutrality, and at the same time, the hardness of the wastewater will be increased, which will bring great benefits to the subsequent treatment. Great difficulty. In addition, the hardness of industrial circulating water continues to increase due to evaporation and other reasons during use, blocking pipes and reducing heat transfer efficiency. It is necessary to reduce the hardness of this part of the water. The traditional double-alkali hardness reduction met...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/66C02F5/02C02F1/001C02F1/44C02F11/122C02F2209/06C02F2209/055C02F2301/066C02F2303/14
Inventor 薛肖冲宋祖民张志新雷涛薛子昂
Owner 陕西大河净化科技有限公司
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