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A cleaning method for organic fouling of hollow fiber ultrafiltration membrane

A technology of ultrafiltration membrane and fiber, which is applied in the field of membrane cleaning, and can solve problems such as increased cleaning times, decreased membrane system performance, difficulty in recovering membrane flux and pressure difference, etc.

Active Publication Date: 2021-04-27
XIAN TPRI WATER & ENVIRONMENTAL PROTECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, in engineering practice, for organic fouling of ultrafiltration membranes, a bactericide-sodium hypochlorite is usually used for online cleaning under alkaline conditions, which can remove microorganisms in the membrane system, but cannot remove the gel layer on the membrane surface due to the accumulation of organic matter. After cleaning, the membrane flux and pressure difference are difficult to recover, and the accumulation of membrane organic pollution will cause a large increase in the number of cleanings, resulting in a significant decline in the performance of the membrane system

Method used

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  • A cleaning method for organic fouling of hollow fiber ultrafiltration membrane
  • A cleaning method for organic fouling of hollow fiber ultrafiltration membrane

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Embodiment

[0046] A power plant uses the secondary sewage from the sewage treatment plant as the production water source, and uses aerated biological tanks and ultrafiltration membranes to further treat the secondary sewage. During the operation of the system, the transmembrane pressure difference increases, and the chemical cleaning efficiency of conventional acid and alkali is low , The output drops obviously, etc., take the ultrafiltration membrane silk for in-depth analysis. The analysis results show that the fouling layer on the surface of the membrane is composed of a relatively dense fouling layer at the bottom and particles attached to the top, and the mass fraction of C, N, and O in the polluting substances reaches more than 96%.

[0047] figure 1 Schematic diagram of the ultrafiltration membrane before cleaning, figure 2 It is a schematic diagram of the ultrafiltration membrane cleaned by the present invention. After the chemical cleaning, the water production flux and the tr...

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Abstract

The invention discloses a method for cleaning organic fouling of a hollow fiber ultrafiltration membrane, which comprises the following steps: first cleaning the hollow fiber ultrafiltration membrane with a surfactant and NaOH, and then cleaning the hollow fiber ultrafiltration membrane with a bactericide , the method can realize the cleaning of the organic fouling of the hollow fiber ultrafiltration membrane, and the cleaning effect is good, the operation is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of membrane cleaning, and relates to a method for cleaning organic fouling of hollow fiber ultrafiltration membranes. Background technique [0002] Ultrafiltration is a sieve separation technology. The ultrafiltration membrane has pores of a certain size and shape. Under the action of pressure, solvent water and small solute ions pass through the membrane from the raw solution side to the product water side, while macromolecules and particles Components are blocked by the membrane. Usually the pore size of the ultrafiltration membrane is 0.01 μm. Utilizing the characteristics of the ultrafiltration membrane to separate solid and liquid, it can remove bacteria, microorganisms, colloids, suspended solids and solid ions of polymer compounds in the liquid. Ultrafiltration membranes have the advantages of high separation precision, low land occupation, high degree of automation, and excellent effluent quality. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/02B01D61/14B01D63/02
CPCB01D61/145B01D63/02B01D65/02B01D2321/16B01D2321/164B01D2321/18
Inventor 李亚娟余耀宏卢剑许臻曹瑞雪李乐
Owner XIAN TPRI WATER & ENVIRONMENTAL PROTECTION