Method for adjusting concentration of cooling water treatment agent in circulating cooling water system, method for recovering discharged cooling water, and treatment device for discharged cooling water

A technology of cooling water treatment and circulating cooling water, applied in water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, sterilization/microdynamic water/sewage treatment, etc., can solve the problems of increasing treatment costs, Achieve stable operation and reduce water treatment costs

Active Publication Date: 2017-02-15
KURITA INDUSTRIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the conventional water recovery system, in order to stabilize the operation of the RO membrane device, it is necessary to add a slime contro

Method used

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  • Method for adjusting concentration of cooling water treatment agent in circulating cooling water system, method for recovering discharged cooling water, and treatment device for discharged cooling water
  • Method for adjusting concentration of cooling water treatment agent in circulating cooling water system, method for recovering discharged cooling water, and treatment device for discharged cooling water

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0111] Example

[0112] Hereinafter, the present invention will be explained more specifically with examples, but the present invention is not limited to the following examples as long as it does not exceed the gist.

Example

[0113] [First Embodiment]

[0114] Using Chiba industrial water as raw water, the effluent from the cooling tower of the circulating cooling water system operating at a concentration rate of 3.5 times (hereinafter referred to as "drain water") is processed in the order of coarse filter, MF membrane device, and RO membrane device. Perform water recovery and return the recovered water to the circulating cooling water system.

[0115] In this circulating cooling water system, as a scale dispersant, a copolymer of acrylic acid and AMPM (acrylic acid: AMPM (molar ratio) = 70:30, weight average molecular weight 10,000, hereinafter referred to as "AA / AMPS") is added to make the system The internal concentration is 3mg / L, and at the same time as a slime control agent, according to the method of the first embodiment of International Publication WO2011 / 125762, a compound chlorine agent prepared using sodium hydroxide, sulfamic acid and sodium hypochlorite is added to make The system maintai...

Example

[0122] [First comparative example]

[0123] In addition to fixing the concentration of the scale dispersant in the circulating water cooling system to 3 mg / L, the concentration of the slime control agent is fixed to 2 mg / L in terms of the combined chlorine concentration, and the water recovery rate in the RO membrane is 65% Except for the treatment in the state, the same cooling water treatment and water recovery treatment as in the first embodiment were performed, and water was passed for 30 days in the same manner, and the pressure change of the RO membrane was investigated. 21 days after the start of operation, the operating pressure of the RO membrane exceeded 1.4 MPa, and the pump head with sufficient water volume could not be ensured, and it was necessary to clean after 30 days of running water.

[0124] In the first comparative example, in the cooling water treatment of the circulating cooling water system, a sufficient amount of scale dispersant concentration was set to 3 m...

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PUM

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Abstract

The present invention reduces the water treatment cost while increasing and stabilizing the water recovery rate when a water recovery system using a separation membrane recovers discharged cooling water, such as blow water from a circulating cooling water system. This circulating cooling water system, into which a cooling water treatment agent is added, is provided with a water recovery system that uses a separation membrane to treat discharge water from the circulating cooling water system, and returns the treated water to the circulating cooling water system. In this circulating cooling water system, the concentration of the cooling water treatment agent in the circulating cooling water system is adjusted in accordance with changes in performance of the separation membrane in the water recovery system.

Description

technical field [0001] The invention relates to a method for adjusting the concentration of cooling water treatment agents of cooling equipment used in building air conditioning, chemical industry, paper industry, iron and steel industry, electric power industry and other industrial processes. The present invention also relates to a recovery method of cooling effluent and a treatment device for cooling effluent. Background technique [0002] Scale barriers will occur on heat transfer surfaces and piping in contact with water in cooling water systems, boiler water systems, etc. From the standpoint of saving resources and energy, when reducing the amount of cooling water discharged (blow water) to the outside of the system and performing high-concentration operation, the salts dissolved in the water will be concentrated, which will easily corrode the heat transfer surface and become insoluble salts and become scale. If the scale adheres to the wall surface of the device, etc...

Claims

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Application Information

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IPC IPC(8): C02F1/44B01D61/12B01D61/14B01D61/58B01D65/08C02F1/50C02F5/00C02F5/08C02F5/10C02F5/14F28G13/00
CPCB01D61/12B01D61/14B01D61/58B01D65/08C02F1/44C02F1/50C02F5/00C02F5/08C02F5/10C02F5/14F28G13/00
Inventor 早川邦洋内田隆彦
Owner KURITA INDUSTRIAL CO LTD
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