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Recovery method and recovery device for discharged cooling water

A recycling method and recycling device technology, which are applied in water shower coolers, cleaning heat transfer devices, chemical instruments and methods, etc., can solve the problems of pre-treatment membrane, RO membrane clogging, weak polymer anti-corrosion effect, etc. Phosphorus concentration, reduced treatment costs, and improved water recovery

Active Publication Date: 2018-02-23
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] In Patent Document 4, if a polymer having only carboxyl groups is used as a dispersant, this substance will be insoluble according to the pH conditions of the water recovery system, resulting in clogging of the pretreatment membrane and RO membrane
Therefore, in Patent Document 4, a polymer with a sulfonic acid group is used as the polymer that passes through the pretreatment membrane, but the anti-corrosion effect of the polymer itself is weak, so it is necessary to add phosphoric acid and phosphine to the cooling water system. Phosphoric acid compounds such as acid and polyphosphoric acid and zinc compounds are used as corrosion inhibitors

Method used

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  • Recovery method and recovery device for discharged cooling water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] Using PMA with a weight-average molecular weight of 2000 as the cooling water of the dispersant, the turbidity removal equipment uses a filter screen and MF membrane device to treat the discharge water in the order of the filter screen, MF membrane device, and RO membrane device for water recovery.

[0135] The mesh aperture of the filter is 400 μm. As the MF membrane, "Pyuria GS" (hydrophilized PVDF, pore size: 0.02 µm, external pressure type) manufactured by Kuraray was used. As the RO membrane, "KROA-2032-SN (polyamide ultra-low pressure RO membrane)" manufactured by Kurita Kogyo Co., Ltd. was used. The cleaning frequency of the MF membrane device is 1 time / 30 minutes.

[0136] The discharge water is passed through the filter screen and the MF membrane device in sequence without adjusting the pH, and then sulfuric acid is added to the inlet side of the RO membrane device to adjust the pH to 5.0. Similarly, sodium bisulfite is added to the inlet side of the RO membr...

Embodiment 2

[0141] In place of PMA with a weight average molecular weight of 2000, 10 mg / L of PAA-1 (on a solid basis) with a weight average molecular weight of 4500 was added as a dispersant, and discharge water was recovered in the same manner as in Example 1. Table 1 shows the average water recovery rate and the phosphate ion concentration of RO membrane concentrated water.

Embodiment 3

[0143] Add the PMA 5mg / L (by solid basis) of molecular weight 2000 as the first dispersant, and the AA / AMPS 5mg / L (by solid basis) of molecular weight 10000 as the second dispersant, replace the PMA of weight average molecular weight 2000, except Other than that, the discharge water was recovered in the same manner as in Example 1. Table 1 shows the average water recovery rate and the phosphate ion concentration of RO membrane concentrated water.

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Abstract

The invention discloses a recovery method and a recovery device for discharged cooling water. The objective of the present invention, in addition to avoiding a problem of discharging phosphorous included in RO membrane concentrated water, is to improve and stabilize water recovery rate when performing RO membrane treatment and water recovery for discharged cooling water, such as blow water, of a circulating cooling water system. Water discharged from the circulating cooling water system is treated by a water recovery system comprising clarification equipment and an RO membrane, and during water recovery, wherein treated water is returned to the circulating cooling water system, a substance which passes through the clarification equipment and includes a polymer comprising a carboxyl group having a weight average molecular weight of 5,000 or less is added to the circulating cooling water system and used as a dispersing agent for dispersing scale components. The polymer comprising a carboxyl group having a weight average molecular weight of 5,000 or less passes through the clarification equipment and, as a scale dispersing agent for the RO membrane, can suppress precipitation of scale. Since the polymer intrinsically has an anticorrosion effect, it becomes unnecessary to add a phosphoric acid compound to the cooling water system as an anticorrosion agent, or the required amount ofthe compound to be added can be minimized, thereby suppressing an increase in phosphorous concentration in the RO membrane concentrated water.

Description

technical field [0001] The invention relates to a recovery method and recovery device for cooling water of cooling equipment used in building air conditioners, or industrial processes such as chemical industry, paper industry, iron industry, and electric power industry. Background technique [0002] Scale barriers may occur on heat transfer surfaces or piping in contact with water in cooling water systems, boiler water systems, etc. In the case of high-concentration operation to reduce the amount of blowing out of the cooling water system in order to save resources and energy, the salts dissolved in the water will be concentrated and easily corrode the heat transfer surface, and will become insoluble Salt and scaling. If scale adheres to the wall surface of the device, etc., it will cause a decrease in thermal efficiency, clogging of piping, etc., which will seriously hinder the operation of the boiler or heat exchanger. [0003] In order to save water or energy, it is nec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44B01D61/02B01D61/14B01D61/58B01D65/08C02F5/00C02F5/10F28G13/00
CPCB01D61/02B01D61/14B01D61/58C02F5/10F28F19/00F28F25/02F28B9/04B01D2311/04B01D2311/12B01D2311/18C02F1/004C02F2103/16C02F2103/28C02F2303/22C02F1/441C02F1/444C02F1/66C02F5/105C02F2103/023C02F2303/08F28G13/00C02F9/00
Inventor 早川邦洋藤田和久
Owner KURITA WATER INDUSTRIES LTD
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