Off-line cleaning method for reverse osmosis membranes

A reverse osmosis membrane, off-line technology, applied in the field of reverse osmosis cleaning, can solve the problems of membrane damage and poor cleaning effect, and achieve the effect of ensuring the desalination rate, ensuring the water flux and improving the cleaning effect.

Inactive Publication Date: 2012-12-05
BAOSTEEL STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a reverse osmosis membrane off-line cleaning method, which can greatly improve the cleaning effect and avoid repeated cleaning of the reverse osmosis

Method used

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  • Off-line cleaning method for reverse osmosis membranes
  • Off-line cleaning method for reverse osmosis membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of cleaning solution: Use pure water to prepare cleaning solution: 2% sodium tripolyphosphate + 0.5% sodium hydroxide solution + 0.25% sodium dodecylbenzenesulfonate solution, put it into the cleaning solution storage tank 3, and adjust to the required temperature : 25°C.

[0037] see figure 1 , put the reverse osmosis membrane into the ultrasonic cleaning tank 1, and put in the cleaning agent, adjust the ultrasonic frequency to 60KHz, and perform ultrasonic cleaning, and the cleaning time is 24h;

[0038] The reverse osmosis membrane after the ultrasonic cleaning is packed in the reverse osmosis membrane tube 6, the cleaning chemical agent A is loaded into the cleaning liquid storage tank 3, the outlet valve b of the cleaning liquid storage tank 3 is opened, and the The valves d, e, f, h of the pipeline 6, and the valves j, l connected to the outlet pipeline of the reverse osmosis membrane tube 6, open the frequency conversion water supply pump 4, keep the...

Embodiment 2

[0046] Preparation of cleaning solution: Use pure water to prepare cleaning solution: 3% sodium tripolyphosphate + 0.2% sodium hydroxide solution + 0.25% sodium dodecylbenzenesulfonate solution, put it into the cleaning solution storage tank 3, and adjust to the required temperature : 25°C.

[0047] Put the reverse osmosis membrane into the ultrasonic cleaning tank 1, and put in the cleaning agent to adjust the ultrasonic frequency to 70KHz, and perform ultrasonic cleaning for 36 hours.

[0048]Put the reverse osmosis membrane after ultrasonic cleaning into the reverse osmosis membrane tube 6, fill the cleaning liquid storage tank 3 with cleaning chemicals, open the valves b, d, e, f, h, j, l, and turn on the frequency conversion water supply pump 4. Keep the pressure within 0.5MPa, if the pressure is too high, open the valve c to adjust the pressure.

[0049] The first low-flow cycle: the total cycle cleaning time is 20 minutes, and the flow rate of the pressure vessel of ea...

Embodiment 3

[0056] Preparation of cleaning solution: Use pure water to prepare cleaning solution: 2% sodium tripolyphosphate + 0.25% sodium hydroxide solution + 0.5% sodium dodecylbenzenesulfonate solution, put it into the cleaning solution storage tank 3, and adjust to the required temperature : 25°C.

[0057] Put the reverse osmosis membrane into the ultrasonic cleaning tank 1, and put in the cleaning agent to adjust the ultrasonic frequency to 50KHz, and perform ultrasonic cleaning for 12 hours.

[0058] Put the reverse osmosis membrane after ultrasonic cleaning into the reverse osmosis membrane tube 6, fill the cleaning liquid storage tank 3 with cleaning chemicals, open the valves b, d, e, f, h, j, l, and turn on the frequency conversion water supply pump 4. Keep the pressure within 0.5MPa, if the pressure is too high, open the valve c to adjust the pressure.

[0059] The first low-flow cycle: the total cycle cleaning time is 20 minutes, and the flow rate of the pressure vessel of e...

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Abstract

The invention discloses an off-line cleaning method for reverse osmosis membranes, which comprises the following steps of: 1) preparation of a cleaning solution with pH value of 10-13, wherein the cleaning solution comprises the following components in percentage by weight: 2-3% of sodium tripolyphosphate, 0.25-0.5% of sodium hydroxide solution, 0.25-0.5% of sodium dodecyl benzene sulfonate solution, and the balance of pure water; 2) ultrasonic cleaning: placing the reverse osmosis membranes into an ultrasonic cleaner, and ultrasonically oscillating to drop off the dirt from the surfaces of the reverse osmosis membranes; 3) circulatory cleaning: placing the reverse osmosis membranes into membrane shells, pumping the cleaning liquid medicine in a cleaning liquid storage tank into the membrane shells by a water supply pump so as to wash the reverse osmosis membranes, and recirculating the cleaning solution to the cleaning solution storage tank; circularly cleaning at low flow for 30-35 min, wherein the flow of a pressure container of each reverse osmosis membrane is 50-100L/min; circularly cleaning at high flow for 1-2 h, and the flow of a pressure container of each reverse osmosis membrane is 101-150L/min; and 4) washing: washing by pure water at low pressure for 20-30 min, thereby guaranteeing to remove the cleaning solution and impurities.

Description

Technical field: [0001] The invention belongs to reverse osmosis cleaning technology, in particular to a reverse osmosis membrane off-line cleaning method, which removes pollutants deposited on the surface of the reverse osmosis membrane through ultrasonic immersion cleaning and chemical cleaning, and is suitable for off-line cleaning of the reverse osmosis membrane. At the same time, the system detects the salt rejection rate and flux of a single membrane. Background technique [0002] As a deep filtration method, reverse osmosis membrane elements have been widely used in various water treatment systems. The principle is: the reverse osmosis membrane is a semi-permeable membrane with selective permeability. In the natural process, the side with lower salt content will flow to the side with higher salt content through the semi-permeable membrane. Call it osmosis until equilibrium is reached, which is the static pressure difference on both sides of the membrane is the osmoti...

Claims

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Application Information

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IPC IPC(8): B01D65/06
Inventor 曹跃华别华俊张翼刘勇
Owner BAOSTEEL STAINLESS STEEL
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