Chemical cleaning method of ultrafiltration membrane

A chemical cleaning and ultrafiltration membrane technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve ultrafiltration membrane fouling, can not meet the cleaning requirements of PTA refined wastewater membrane treatment process, and the cleaning effect is not good, etc. problem, to achieve the effect of ensuring stable progress

Active Publication Date: 2009-05-06
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, by adjusting the pH and water temperature, most of the colloidal substances in the wastewater can be destabilized and precipitated to form suspensions. After the pre-filtration treatment before the membrane, most of the colloidal substances are removed in the form of suspended solids, but there are still some suspended solids and unseparated colloidal substances entering the ultrafiltration unit. As the ultrafiltration runs for a certain period of time, the ultrafiltration membrane fouling
[0006] Due to the unique pollutant composition and colloidal characteristics in PTA refining wastewater, the cleaning effect of the chemical cleaning formula and cleaning method in the prior art is not good, and cannot meet the cleaning requirements of the PTA refining wastewater membrane treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] After the PTA refining wastewater is pretreated, it enters the ultrafiltration unit for treatment. The ultrafiltration unit uses a hollow fiber ultrafiltration membrane module made of modified polysulfone, with a molecular weight cut-off of 100,000 Daltons, and the operation mode adopts full filtration.

[0020] In the initial stage of ultrafiltration unit filtering wastewater, when the water temperature is 25°C, the operating pressure of the ultrafiltration membrane module is 0.055MPa, and the product water flux is 70l / m 2 h; After filtering PTA refined wastewater for a period of time, the operating pressure of the ultrafiltration membrane module rises to 0.12MPa, and the flux of product water drops to 60l / m 2 h, the membrane has been polluted and enters the cleaning procedure.

[0021] 1. Stop feeding waste water to the ultrafiltration membrane device, start the backwash pump, enter the membrane module from the water production end of the membrane module for backwash...

Embodiment 2

[0028] The same hollow fiber ultrafiltration membrane module as in Example 1 was used, the molecular weight cut off was 10,000 Daltons, and the operation mode was full filtration.

[0029] In the initial stage of the ultrafiltration unit filtering wastewater, when the water temperature is 25°C, the operating pressure of the ultrafiltration membrane module to filter clean water is 0.05MPa, and the product water flux is 60l / m 2 h; After filtering PTA refined wastewater for a period of time, the operating pressure of the ultrafiltration membrane module rises to 0.13MPa, and the flux of product water drops to 50l / m 2 h, the membrane has been polluted and enters the cleaning procedure.

[0030] 1. Stop feeding waste water to the ultrafiltration membrane device, start the backwash pump, enter the membrane module from the water production end of the membrane module for backwash, and discharge the backwash water; the backwash flux is 110l / m 2 h, backwash time 20min; then use clean wa...

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Abstract

The invention discloses an ultrafiltration membrane chemical cleaning method and aims at an ultrafiltration membrane that is used for processing purified PTA waste water. The invention uses an acid lotion prepared by citric acid and sodium bisulfite for dissolving and eluting inorganic pollutants that are formed by cobalt and manganese ion hydroxide, deposited and absorbed on the surface of the ultrafiltration membrane, and uses an alkaline oxidative lotion that contains sodium hypochlorite for dissolving and eluting organic colloid pollutants that are deposited and absorbed on the surface of the ultrafiltration membrane. The ultrafiltration membrane chemical cleaning method can effectively elute the pollutants, recover the running flux and running pressure of the ultrafiltration membrane, and ensure stable running of the purified PTA waste water in an ultrafiltration process.

Description

technical field [0001] The invention relates to a chemical cleaning method for an ultrafiltration membrane, in particular to a chemical cleaning method for an ultrafiltration membrane for treating PTA refining wastewater. By adopting the method of the invention, the influence of ultrafiltration membrane fouling on the membrane treatment process can be effectively removed, and the stable progress of the PTA wastewater membrane treatment process can be ensured. Background technique [0002] In order to effectively treat the refined wastewater of purified terephthalic acid (PTA) and achieve the purpose of wastewater reuse, the inventor has adopted a treatment method based on a membrane method. The method is characterized by: removing the PTA in the wastewater by ultrafiltration Macromolecules and colloidal substances are removed by reverse osmosis filtration to remove organic matter and metal ions in wastewater, and then further remove organic matter and metal ions in wastewate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D65/06B01D61/14
Inventor 莫馗彭海珠卢姝梁燕王玉杰
Owner CHINA PETROLEUM & CHEM CORP
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