Chemical cleaning method of ultrafiltration membrane

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...

AI Technical Summary

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 ultrafiltration membrane pores. Microbial colloid), a chemical cleaning method for ultrafiltration membranes that increase the water flow rate of ultrafiltration membranes, reduce the operating pressure of ultrafiltration membranes, and ensure the stable operation of ultrafiltration membranes for landfill leachate treatment

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