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Method for treating reclaimed water reused as circulating cooling water of power plant

A technology of circulating cooling water and treatment methods, which is applied in the direction of adsorption water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of high water content in chemical sludge, difficult sludge disposal, and poor effluent stability, etc., to achieve Improve the removal efficiency, increase the removal rate, and reduce the effect of moisture content

Inactive Publication Date: 2013-07-17
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Description
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Problems solved by technology

[0004] Aiming at the shortcomings of the existing lime softening method used in reclaimed water treatment, such as high moisture content of chemical sludge, difficulty in dehydration, poor effluent stability, and difficult disposal of sludge, the present invention provides a method that is beneficial to sludge dehydration, has good effluent stability and is not easy to Treatment method for reclaimed water reused in power plant circulating cooling water that causes pipe scaling

Method used

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Embodiment Construction

[0017] In the present invention, the treatment of reclaimed water reused in power plant circulating cooling water is carried out by adding fly ash in the stirring tank and adding lime emulsion and flocculant in the flocculation clarification tank. The flocculation clarification tank includes a mixing section, a flocculation paragraphs and clarification paragraphs. The specific process is as follows.

[0018] 1. Add fly ash in the mixing tank

[0019] The secondary effluent of the urban sewage treatment plant (hereinafter collectively referred to as raw water) enters the mixing tank, and the fly ash is added into the mixing tank. Fly ash and raw water are fully mixed under stirring, the dosage of fly ash is 270mg / L, and the mixing reaction time of fly ash is 4-5 minutes.

[0020] At present, the fly ash particles from flue gas dust removal in power plants are divided into three types: small particle size, medium particle size and large particle size. The present invention ad...

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Abstract

The invention provides a method for treating reclaimed water reused as circulating cooling water of a power plant. The method comprises the following steps of: 1, coal ash preprocessing stage: directly adding coal ash into second-level discharged water of a municipal sewage plant and mixing the coal ash with raw water; 2, lime softening stage: adding lime emulsion and a flocculant into the mixed solution of the coal ash and the raw water, obtained in the coal ash preprocessing stage, and stirring, wherein the retention time of the mixed solution is 2-3min in the lime softening stage; 3, flocculation stage: stirring and standing for 15-25min; and 4, settling stage: standing for 1.5-2.5h in the settling stage and then discharging for use. According to the method, the coal ash is used for adsorbing a part of organic substances in the reclaimed water, so that chemical agent cost is reduced, sludge dewatering is facilitated, and the stability of discharged water is good, and the turbidity removal rate, TDS (Total Dissolved Solids) removal rate and calcium hardness removal rate of water are greatly improved.

Description

technical field [0001] The invention relates to a method for treating reclaimed water reused as circulating cooling water of a power plant, and belongs to the technical field of sewage treatment. Background technique [0002] After urban reclaimed water is treated, it can be used as circulating cooling water in power plants. The treatment methods can be divided into: lime softening method, ion exchange method, ultrafiltration / nanofiltration double-membrane method, etc. The ion resin exchange method consumes a lot of salt, has a long cycle, produces a large amount of waste liquid, is costly, and has poor universal applicability. Although the effluent quality of the double-membrane method is good, the investment and operation costs are high, and the operation and maintenance are difficult. [0003] At present, the widely used, reliable and experienced methods in power plants are mostly lime softening methods. Lime softening means adding Ca(OH) to the secondary effluent of ur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/28
Inventor 程丽华孙杰毕学军刘长青
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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