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Chemical cleaning and chemical repairing method and system for waste reverse osmosis membrane

A reverse osmosis membrane and chemical cleaning technology, applied in the field of water treatment, can solve problems such as inability to monitor the performance of a single membrane, waste of chemical reagents, breakdown of reverse osmosis membrane, etc., to save cleaning time, reduce environmental load, and reduce difficulty Effect

Inactive Publication Date: 2011-06-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to solve the problems existing in the prior art, to develop a method and system specially used for chemical cleaning and chemical repair of waste reverse osmosis membranes, to solve Problems encountered in the chemical cleaning of the existing reverse osmosis membrane off-line cleaning device: inability to monitor the performance of a single membrane, incomplete cleaning, waste of chemical reagents, reverse osmosis membrane breakdown caused by fresh water reverse cleaning, etc.

Method used

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  • Chemical cleaning and chemical repairing method and system for waste reverse osmosis membrane
  • Chemical cleaning and chemical repairing method and system for waste reverse osmosis membrane
  • Chemical cleaning and chemical repairing method and system for waste reverse osmosis membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Utilize method and device of the present invention (see figure 1 ) to measure the performance of BW30-400 new reverse osmosis membrane. The experimental process is to use the tap water (6) pretreated by the activated carbon filter (2) and the first cartridge filter (4b) as the test solution to investigate the feed water conductivity of the new reverse osmosis membrane under different feed water pressures. Rate, freshwater conductivity, influent flow rate and freshwater flow rate change trend, the relevant data obtained are shown in Table 1. Based on these data, it is calculated as figure 2 , 3 The salt removal and water recovery curves (0.13~1.48MPa) of the new reverse osmosis membrane are shown.

[0042]

Embodiment 2

[0044] This example is the whole process of chemically cleaning the BW30-400 waste reverse osmosis membrane. After performing different cleaning steps, tap water (6) pretreated by the activated carbon filter (2) and the first cartridge filter (4b) was used as the test solution respectively, and the water inlet pressure was 1.20 and 1.50 MPa respectively. The feedwater conductivity, freshwater conductivity, feedwater flow rate, fresh water flow rate, feedwater pressure and concentrated water pressure of the reverse osmosis membrane were measured, and the experimental data and results in Tables 2 and 3 were obtained. Figure 4 various change curves. Based on these data, the main performance parameters of the spent RO membranes shown in Table 4 after different chemical cleaning steps were calculated.

[0045]

[0046]

[0047]

Embodiment 3

[0049] Utilize the method and device of the present invention to carry out chemical cleaning to CPA3-8040 high pressure differential old reverse osmosis membrane, the result is shown in Table 5. The characteristic of this membrane is that the initial pressure difference is too large, which is 1.25MPa, and the membrane has been blocked, so its initial desalination performance cannot be measured. After backwashing, the flow path of the membrane is opened. Subsequently, it was cleaned with an acidic cleaning solution, and the pressure difference gradually dropped to 0.17MPa, but its desalination rate and water recovery rate were still low, 71.9% and 11.4% respectively, so an alkaline cleaning solution was used to clean it. Cleaning was carried out. Alkaline cleaning is mainly to remove organic matter, colloid, and SiO on the surface of the membrane 2 Wait. After alkaline washing, the desalination rate drops to 69.9%, the water recovery rate rises to 19.2%, and the pressure dif...

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Abstract

The invention discloses a chemical cleaning and chemical repairing method and system for a waste reverse osmosis membrane, belonging to the field of water treatment, wherein the method and system can be used for regenerating the waste reverse osmosis membrane, reducing the water production cost and saving resources. The method disclosed by the invention comprises the following steps: producing pure water for preparing a chemical cleaning-repairing liquid, and storing the pure water in a corresponding container; carrying out back flushing on the waste membrane by utilizing a high-pressure pump, and flushing out the dirt deposited in the water inlet area of the membrane; carrying out forward pumping pm the cleaning liquid into the waste membrane, wherein one part of the cleaning liquid passes through the waste membrane and flows back to the container, and the other part of the cleaning liquid is subjected to chemical reaction with the residual dirt on the surface of the membrane; removing insoluble substances by utilizing a filter before the cleaning liquid flows back to the container; and performing circular cleaning; and if the water recovery rate of the waste membrane is excessively high and the salt removal rate is relatively low after the chemical cleaning, pumping the repairing liquid into the waste membrane again, wherein the repairing liquid passes through the waste membrane to perform circular repairing, and finally the performance parameters of the repaired waste membrane are approximate to those of a new membrane. The method and system disclosed by the invention have the characteristics that the performance parameters of the membrane cleaning process are calculated by use of the display values of a monitoring instrument of the cleaning system, and the chemicalcleaning and repairing processes for the membrane are further instructed.

Description

technical field [0001] The invention relates to a method and system for chemical cleaning and chemical restoration of waste reverse osmosis membranes, belonging to the technical field of water treatment. It is suitable for chemical cleaning and chemical repair of waste reverse osmosis membrane and determination of reverse osmosis membrane performance. Background technique [0002] Reverse osmosis technology is currently widely used in the water treatment industry. Its working principle is driven by pressure difference, and the separation of solvent and solute is achieved by using the selective permeability of the membrane. Due to the selective permeability of the membrane, the solute in the feed water concentrates on the surface of the reverse osmosis membrane, forming precipitates that adhere to the surface of the reverse osmosis membrane or block the pores of the reverse osmosis membrane, resulting in fouling of the reverse osmosis membrane and performance degradation. Du...

Claims

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Application Information

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IPC IPC(8): B01D65/02B01D65/10
Inventor 李永生
Owner SICHUAN UNIV
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