Off-line cleaning system and off-line cleaning method for water treatment membrane

A technology for water treatment membranes and cleaning systems, applied in separation methods, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of affecting the service life of membranes, attenuation of desalination performance, and high cost of cleaning agents, achieving low cost and recovery. performance effect

Pending Publication Date: 2022-07-15
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this cleaning method can effectively restore the performance of the membrane, it is easy to cause damage to the separation membrane of the water treatment membrane, resulting in attenuation of the desalination performance and affecting the service life of the membrane.
In addition, the cost of the cleaning agent is high, a large amount of cleaning waste liquid is generated, and it is difficult to dispose of it

Method used

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  • Off-line cleaning system and off-line cleaning method for water treatment membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] like figure 1 As shown, the offline cleaning system in Example 1 includes:

[0104] Clear water tank, feed pump, membrane shell, ion exchange resin column (anion resin column and cation resin column are connected in series, among which, the anion exchange resin column is filled with D201 macroporous strong acid anion exchange resin (similar products include AmberliteIRA-900 in the United States, Lewatit MP in Germany) -500, etc.), the cation exchange resin column is filled with D001 (similar products include Amberlite 200 in the United States, Lewatit SP-120 in Germany, etc.), and the ion exchange resin is transformed into a Cl-type anion resin through conventional pretreatment and transformation. The exchange resin is transformed into Na-type resin, and the pretreatment and transformation of resin is the industry standard method), alkali washing tank and acid washing tank,

[0105] Among them, the liquid outlet of the clean water tank, the liquid outlet of the alkali ...

Embodiment 2

[0118] The cleaning system in Example 2 is basically the same as that in Example 1, except that the ion exchange resin column in Example 1 is replaced by a water treatment membrane module with a model of Dow BW30-400, wherein the water treatment membrane module The produced concentrated water is mixed with the influent water of the wastewater treatment device in the factory area for treatment.

[0119] Using the cleaning system in Example 2 and cleaning the water treatment membrane to be cleaned in the manner in Example 1, and testing the cleaned water treatment membrane, it was found that the flux of the water treatment membrane element cleaned by the above steps From 90% to 99% of the standard flux of the product, the salt rejection rate is 99%.

Embodiment 3

[0121] The cleaning system in Example 3 is basically the same as that in Example 1, except that a cationic ion exchange resin column is used instead of the series-connected anion exchange resin column and cationic exchange resin column in Example 1.

[0122] The cleaning system in Example 3 was used to clean the water treatment membrane to be cleaned according to the method in Example 1, and the cleaned water treatment membrane was tested. It was found that the flux of the cleaned water treatment membrane element changed from the product From 90% of the standard flux to 98%, the desalination rate reaches 99%.

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Abstract

The invention provides an off-line cleaning system for a water treatment membrane, which comprises a water storage device, a liquid conveying device, a water treatment membrane loading device and a precipitated ion removing device, and is characterized in that a liquid outlet of the water storage device is connected with a liquid inlet of the liquid conveying device; a liquid outlet of the liquid conveying device is connected with a liquid inlet of the water treatment membrane loading device, a concentrated water outlet of the water treatment membrane loading device is connected with a liquid inlet of the precipitated ion removal device, and a liquid outlet of the precipitated ion removal device is connected with a concentrated water inlet of the water storage device. Through cooperative use of the water storage device, the liquid conveying device and the precipitated ion removal device, calcium sulfate scales on the water treatment membrane are effectively removed, and the separation cortex of the water treatment membrane cannot be damaged.

Description

technical field [0001] The invention relates to the field of cleaning of water treatment membranes, in particular to an offline cleaning system and an offline cleaning method of water treatment membranes. Background technique [0002] The increasing scarcity of freshwater resources is a major global environmental problem. It is predicted that the world will face a water deficit of up to 40% by 2030. In this context, reverse osmosis technology has been widely used in many fields such as seawater desalination, brackish water desalination, industrial wastewater treatment and advanced treatment of municipal water supply. [0003] Reverse osmosis technology is a pressure-driven membrane separation process. During the operation of reverse osmosis, membrane fouling often inevitably occurs, which is manifested as a decrease in water production and an increase in pressure difference between sections. When the membrane fouling reaches a certain level, most of the pollutants can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02C02F1/44C02F1/42C02F1/461C02F1/469C02F9/04C02F9/06
CPCB01D65/02C02F1/44C02F1/441C02F1/42C02F1/447C02F1/46104C02F1/469C02F1/4693B01D2321/162B01D2321/164B01D2321/166B01D2321/168C02F2001/422C02F2001/425C02F2001/427C02F2303/16
Inventor 何灿海玉琰熊日华
Owner CHNA ENERGY INVESTMENT CORP LTD
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