Cleaning method for ultrafiltration membrane used in seawater desalination

An ultrafiltration membrane and water washing technology, applied in chemical instruments and methods, ultrafiltration, seawater treatment, etc., can solve the problems of long time, the influence of total water production, and the influence of cleaning time on the ultrafiltration process section, so as to save cleaning chemicals. , the effect of shortening the cleaning time

Inactive Publication Date: 2017-08-04
青岛百发海水淡化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Routine off-line chemical cleaning of UF membranes restores performance but is time consuming
The cleaning time will aff

Method used

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  • Cleaning method for ultrafiltration membrane used in seawater desalination

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Embodiment one:

[0019] A method for cleaning an ultrafiltration membrane in seawater desalination applications, comprising the following steps:

[0020] (1) Water flushing or chemically enhanced backwashing;

[0021] (2) Pickling: The pickling solution uses citric acid solution with a mass fraction of 1% or an oxalic acid solution with a mass fraction of 2-10%; the water temperature is 30-35°C; the pickling flow rate is 150-200m 3 / h, the pickling cycle time is 1-2h, ph=2; the pickling solution also contains EDTA;

[0022] (3) Soaking: after the cycle ends, the soaking time is 1-2h, and the soaking solution is a pickling solution;

[0023] (4) Water backwash or chemically enhanced backwash, the chemically enhanced backwash flux is 250lmh.

[0024] The specific steps of pickling are: configure a pickling solution with a pH of 2, and perform variable flow circulation on the ultrafiltration membrane group, with a circulation flow of 150m 3 / h cycle for 15 minutes, th...

Example Embodiment

[0027] Embodiment two:

[0028] A cleaning method for ultrafiltration membranes in seawater desalination applications, comprising the following steps:

[0029] (1) Water flushing, flow rate 175m 3 / h is, the time is 15 to 30 minutes;

[0030] (2) pickling: the pickling solution adopts a citric acid solution with a mass fraction of 1%, and the water temperature is 30°C; the pickling cycle time is 1h, and ph=2;

[0031] (3) Soaking: after the cycle ends, the soaking time is 1h, and the soaking solution is the pickling solution;

[0032] (4) Chemically enhanced backwashing, the chemically enhanced backwashing flux is 250LMH (liter / square meter / hour).

[0033] The specific steps of pickling are: configure a pickling solution with a pH of 2, and perform variable flow circulation on the ultrafiltration membrane group, with a circulation flow of 150m 3 / h cycle for 15 minutes, the flow rate rises to 175m within 15 seconds 3 / h cycle for 15 minutes, and the flow will rise to 200m...

Example Embodiment

[0034] Embodiment three:

[0035] A cleaning method for ultrafiltration membranes in seawater desalination applications, comprising the following steps:

[0036] (1) Chemically enhanced backwash with a flux of 250LMH;

[0037] (2) pickling: the pickling solution adopts oxalic acid solution with a mass fraction of 2%, and simultaneously adds 100 ppm of EDTA; the water temperature is 35° C.; the pickling cycle time is 2 hours, and ph=2;

[0038] (3) Soaking: after the cycle ends, the soaking time is 2h, and the soaking solution is the pickling solution;

[0039] (4) Water backwashing, the flux is 250LMH, and the time is 2 minutes.

[0040] The specific steps of pickling are: configure a pickling solution with a pH of 2, and perform variable flow circulation on the ultrafiltration membrane group, with a circulation flow of 150m 3 / h cycle for 15 minutes, the flow rate rises to 175m within 15 seconds 3 / h cycle for 15 minutes, and the flow will rise to 200m within 15 seconds ...

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Abstract

The invention discloses a cleaning method for an ultrafiltration membrane used in seawater desalination. The cleaning method comprises the following steps: flushing with water or chemical-reinforced backwashing; acid pickling; soaking; and flushing with water or chemical-reinforced backwashing, wherein an acid pickling solution is a citric acid solution with a mass fraction of 1% or an oxalic acid solution with a mass fraction of 2 to 10%, and the acid pickling solution contains EDTA. The method provided by the invention can shorten the cleaning time for the ultrafiltration membrane to 1/3 of off-line cleaning time or shorter, so the effect of off-line cleaning is realized via short-time chemical maintenance.

Description

technical field [0001] The invention relates to the technical field of cleaning and maintenance of ultrafiltration membranes, in particular to a cleaning method for ultrafiltration membranes in seawater desalination applications. Background technique [0002] Ultrafiltration is a screening process. The pressure difference on both sides of the membrane is used as the driving force, and the ultrafiltration membrane is used as the filter medium. The micropores only allow water and small molecular substances to pass through and become the permeate, while the substances in the original solution whose volume is larger than the micropore diameter of the membrane surface are trapped on the liquid inlet side of the membrane and become a concentrated solution, thus realizing the purification and separation of the original solution. and concentration purposes. In the seawater desalination project, the pressure difference and water production performance of the ultrafiltration membrane...

Claims

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Application Information

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IPC IPC(8): B01D65/02B01D65/06B01D61/14C02F1/44C02F103/08
CPCY02A20/131B01D65/02B01D61/145B01D2321/02B01D2321/04B01D2321/162B01D2321/168B01D2321/28C02F1/444C02F2103/08C02F2303/14
Inventor 张晓东杨兴涛李珂赵洪武刘长青吴成志张卫军潘光建万鹏于崇勤李伟孙勇飞汤军强刘祯郭成祥袁陆王成龙于勇
Owner 青岛百发海水淡化有限公司
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