Method for the treatment with reverse osmosis membrane

A technology of reverse osmosis membrane and treatment method, which is applied in the field of reverse osmosis membrane treatment of raw water containing trace iron

Inactive Publication Date: 2010-02-17
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in an RO membrane device using an RO membrane treated with such a rejection enhancer, it is unknown how various substances contained in the feed water to the RO membrane have an effect.

Method used

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  • Method for the treatment with reverse osmosis membrane
  • Method for the treatment with reverse osmosis membrane
  • Method for the treatment with reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] The present invention will be described in detail below with reference to Examples and Comparative Examples.

[0044] It should be noted that the rejection rate in this example involves ionic substances, and is calculated by the following formula from the measured value of conductivity.

[0045] Rejection rate = 1-(conductivity of permeate liquid×2) / (conductivity of feed liquid + conductivity of concentrated liquid)

Embodiment 1

[0052] A polymer in which AMPS and AA were copolymerized at a ratio of 20:80 mol% (hereinafter referred to as "polymer 1") was added to the raw water to achieve 3 mg / L, and RO treatment was performed under the same conditions as in Comparative Example 1 . Table 2 shows the measurement results of flux (25°C, 0.75 MPa) and rejection rate of the RO device at this time.

[0053] As shown in Table 2, in Comparative Example 1 in which polymer 1, which is a sulfo group-containing compound, was not added, the flux decreased over time even under conditions that did not cause rust such as calcium, silica, or magnesium. . However, as in Example 1, the decrease in flux can be suppressed by adding Polymer 1 as a compound containing a sulfo group.

Embodiment 2

[0057] RO treatment was performed under the same conditions as in Comparative Example 2 except that the polymer 1 was added to the raw water to be 3 mg / L. Table 2 shows the measurement results of flux (25°C, 0.75 MPa) and rejection rate of the RO device at this time.

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Abstract

A method for the treatment with a reverse osmosis membrane which is suppressed in the flux deterioration occurring even under such conditions that only a slight amount of iron is contained in the water fed to a reverse osmosis membrane treatment unit and therefore no scale of calcium or silica is generated. Namely, a method of treating raw water containing iron in an amount of as low as 1000¢mu!g / L or below in terms of total iron with a reverse osmosis membrane, characterized in that a sulfo-bearing compound is added to the raw water.

Description

technical field [0001] The invention relates to a reverse osmosis membrane treatment method, in particular to a method for performing reverse osmosis membrane treatment on raw water containing trace amounts of iron. Background technique [0002] In the process of recovering wastewater for regeneration and reuse, or in the process of desalination of seawater, in order to obtain high-quality treated water, sometimes removable electrolytes, low- and medium-molecular nanofiltration membranes or reverse osmosis membranes are used (unless otherwise specified below) , the reverse osmosis membrane includes a nanofiltration membrane, and the reverse osmosis membrane is described as "RO membrane"). [0003] In reverse osmosis membrane treatment (hereinafter referred to as "RO treatment"), it is known that when iron exists in raw water, the RO membrane is clogged due to iron oxide adhering to the membrane surface. In order to prevent this problem, methods of adding a rust inhibitor or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F1/64B01D61/04
CPCB01D2321/168C02F1/72C02F1/56B01D2311/04C02F1/32C02F1/42C02F2303/02B01D65/08C02F1/283C02F1/441C02F1/444C02F2101/203B01D61/04C02F9/00B01D61/025B01D2311/12B01D2311/246C02F1/44C02F1/64C02F2101/20
Inventor 川胜孝博平野昭英
Owner KURITA WATER INDUSTRIES LTD
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