Chemical cleaning method of ultrafiltration membrane

A technology for chemical cleaning and ultrafiltration membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc.

Active Publication Date: 2017-11-28
HUNAN JUNXIN ENVIRONMENTAL PROTECTION CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, especially for the membrane fouling form of organic dirt wrapped inorganic dirt, to provide a method that can efficiently remove all kinds of organic matter (especially grease and oil) trapped on the ultr

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  • Chemical cleaning method of ultrafiltration membrane

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Embodiment 1

[0048] In this example, the landfill leachate wastewater enters the ultrafiltration system after being biochemically treated by MBR to realize the separation of mud and water. The ultrafiltration unit is a tubular ultrafiltration membrane module made of PVDF, with a membrane pore diameter of 8 mm and a molecular weight cut-off of 1,000 to 100,000 Dal. Dayton, the area of ​​a single membrane is 27m 2 , The operation method adopts cross-flow filtration.

[0049] In this embodiment, the fouling form of the ultrafiltration membrane is mainly organic dirt enclosing inorganic dirt. The pollution form is related to the specific components of the landfill leachate. When the total amount of dissolved solids in the landfill leachate is high; when the concentration of calcium and magnesium ions and suspended solids are quite high, the pollution form of the ultrafiltration membrane is mainly inorganic scale wrapped with organic scale; when When the concentration of calcium and magnesium ...

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Abstract

The invention discloses a chemical cleaning method of an ultrafiltration membrane. The chemical cleaning method is mainly used for treating the membrane pollution form of inorganic scale coating with organic scales, and comprises the following steps of (1) preparing a basic cleaning solution; (2) performing alkali washing: performing cyclic cleaning on the ultrafiltration membrane by the basic cleaning solution; controlling the pH value of the cleaning solution to be 10.5 to 11.5; controlling the cleaning temperature at 38 to 41 DEG C; (3) performing primary flushing; removing basic cleaning liquid remained in the ultrafiltration membrane; (4) preparing an acid cleaning solution; (5) performing acid washing: performing cyclic cleaning on the ultrafiltration membrane by the acid cleaning solution; controlling the pH value of the cleaning solution to be 1.5 to 3; controlling the cleaning temperature at 38 to 41 DEG C; (6) performing secondary flushing to remove the acid cleaning solution remained in the ultrafiltration membrane. The method provided by the invention has the advantages that various organic matters intercepted on holes of the ultrafiltration membrane can be effectively removed; the water production flow rate of the ultrafiltration membrane can be improved; the operation pressure of the ultrafiltration membrane can be reduced; the stable operation of a landfill leachate ultrafiltration membrane treatment system is ensured.

Description

technical field [0001] The invention belongs to the technical field of landfill leachate treatment, and relates to a chemical cleaning method for an ultrafiltration membrane, in particular to a chemical cleaning method for an ultrafiltration membrane used to treat landfill leachate. Background technique [0002] Since membrane fouling will always occur during the operation of ultrafiltration, when the ultrafiltration operates for a period of time, the membrane flux will drop significantly. Due to the clogging of surface pollutants, the water flux and separation capacity of the ultrafiltration membrane will gradually decrease. The water flux of the membrane cannot be recovered 100% by physical flushing. Therefore, when the water flux of the ultrafiltration membrane drops by 30-40%, chemical cleaning must be carried out to remove all kinds of impurities attached to the ultrafiltration membrane wall and membrane pores in time. Organic pollutants, prevent ultrafiltration from fo...

Claims

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Application Information

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IPC IPC(8): B01D65/02C02F1/44C02F103/06
CPCB01D65/02B01D2321/162B01D2321/164C02F1/444C02F2103/06
Inventor 高新蔡斌周俊李涛宏徐辉田黎黎
Owner HUNAN JUNXIN ENVIRONMENTAL PROTECTION CO LTD
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