Chemical cleaning method of reverse osmosis membrane

A reverse osmosis membrane and chemical cleaning technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of complex composition, unable to meet the cleaning requirements of PTA purification wastewater membrane treatment process, poor cleaning effect, etc. , to achieve the effect of ensuring continuous and stable progress

Active Publication Date: 2010-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The composition of PTA refining wastewater is complex, which contains colloidal substances formed by organic substances such as cobalt, manganese ions and PTA. Before membrane treatment, most of the colloidal substances in the wastewater can be precipitated into suspended solids by adjusting the pH and water temperature. , and then removed by filtration and ultrafiltration, but there is still a small amount of unprecipitated colloidal substances entering the reverse osmosis unit. With the increase of the reverse osmosis operation time, the reverse osmosis membrane will be fouled
[0006] Due to the unique pollutant composition and colloidal characteristics in PTA refined wastewater, the chemical cleaning formula and cleaning method in the prior art are not targeted, the cleaning effect is not good, and cannot meet the cleaning requirements of the PTA refined wastewater membrane treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] PTA refined wastewater enters the reverse osmosis treatment unit after pretreatment and ultrafiltration.

[0020] The reverse osmosis unit uses two roll-type reverse osmosis membrane modules made of polyamide, with a single membrane area of ​​7.9m 2 , using parallel operation.

[0021] In the initial stage of treating PTA wastewater in the reverse osmosis unit, the water temperature is 25°C, the operating pressure of the reverse osmosis membrane module is 1.1MPa, and the product water flux is 25L / m 2 h, the desalination rate is 99.5%; after treating the PTA refined wastewater for a period of time, the operating pressure of the reverse osmosis module rises to 1.2MPa, and the product water flux drops to 21L / m 2 h, the desalination rate is reduced to 99%, and the reverse osmosis membrane has been polluted, so it enters the cleaning procedure.

[0022] 1. Stop feeding water to the reverse osmosis device, and use the reverse osmosis water to flush the membrane module, and ...

Embodiment 2

[0029] Using the same roll-type reverse osmosis membrane module as in Example 1, the area of ​​a single membrane is 7.9m 2 , running in parallel.

[0030] In the initial stage of treating PTA wastewater in the reverse osmosis unit, the water temperature is 25°C, the operating pressure of the reverse osmosis membrane module is 1.0MPa, and the product water flux is 24L / m 2 h, the desalination rate is 99%; after treating PTA refined wastewater for a period of time, the operating pressure of the reverse osmosis module rises to 1.2MPa, and the product water flux drops to 20L / m 2 h, the desalination rate is reduced to 98.6%, the reverse osmosis membrane has been polluted, and it enters the cleaning procedure.

[0031] 1. Stop feeding water to the reverse osmosis device, and use the reverse osmosis produced water to flush the membrane module, and the flushing flux is 90L / m 2 h, flushing time 25min;

[0032] 2. Prepare 1% citric acid and sodium bisulfite solution with reverse osmos...

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PUM

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Abstract

The invention relates to a chemical cleaning method of a reverse osmosis membrane. In the method, aiming at a reverse osmosis membrane for processing PTA refining wastewater, inorganic pollutants which are formed by cobalt ions, manganese ions, hydroxide thereof and the like and are deposited and adsorbed on the surface of the membrane are dissolved and eluted by using acid rinse prepared by citric acid and sodium bisulfite; organic colloid pollutants deposited and adsorbed on the surface of the membrane are dissolved and eluted by using alkaline rinse containing sodium dodecyl benzene sulfonate and sodium hydroxide. The method can elute the pollutants on the surface effectively, restore operating flux, operating pressure and desalination rate of the reverse osmosis membrane, and ensure that the process of processing the reverse osmosis membrane for the PTA refining wastewater is stable in operation.

Description

technical field [0001] The invention relates to a chemical cleaning method of a reverse osmosis membrane, in particular to a chemical cleaning method of a reverse osmosis membrane for treating PTA refining wastewater. By adopting the method of the invention, the pollution of the reverse osmosis membrane can be effectively removed, and the stable progress of the PTA wastewater membrane treatment process can be ensured. Background technique [0002] In order to treat purified terephthalic acid (PTA) wastewater and achieve the purpose of wastewater reuse, a treatment method based on membrane separation is generally used. The method is characterized by: removing macromolecules and colloidal substances in wastewater by ultrafiltration, Reverse osmosis removes organic matter and metal ions in wastewater, and then further removes organic matter and metal ions in wastewater by ion exchange. The treated wastewater meets the water quality requirements for PTA production process water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
CPCY02A20/131
Inventor 莫馗彭海珠卢姝梁燕王玉杰
Owner CHINA PETROLEUM & CHEM CORP
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