Cleaning method of ultrafiltration membrane

Abstract

The invention discloses a cleaning method of an ultrafiltration membrane. The cleaning method is used for mainly treating the pollution form of the ultrafiltration membrane with inorganic scales coated with organic scales. The method comprises the following steps: (1) preparing an acid cleaning solution; (2) carrying out acid pickling: carrying out circulating cleaning on the ultrafiltration membrane by using the acid cleaning solution, controlling the pH value of the cleaning solution to be 1.5-3 and controlling the cleaning temperature to be 38-41 DEG C; (3) carrying out primary flushing and removing residual acid cleaning solution in the ultrafiltration membrane; (4) preparing an alkaline cleaning solution; (5) carrying out alkaline washing: carrying out circulating cleaning on the ultrafiltration membrane by using the alkaline cleaning solution, controlling the pH value of the cleaning solution to be 10.5-11.5 and controlling the cleaning temperature to be 38-41 DEG C; and (6) carrying out secondary flushing and removing the residual alkaline cleaning solution in the ultrafiltration membrane. According to the method, various organic matters intercepted on ultrafiltration membrane pores can be efficiently removed, the water yield of the ultrafiltration membrane is increased, the operation pressure of the ultrafiltration membrane is reduced and 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 cleaning method for an ultrafiltration membrane, in particular to a cleaning method for an ultrafiltration membrane used to treat landfill leachate. Background technique [0002] Due to the unique water quality characteristics of landfill leachate, such as many types of inorganic pollutants and organic pollutants, complex water quality, high hardness, high concentration of organic pollutants, and a wide range of changes, the ultrafiltration membrane has been in operation for many years. The pollution on the surface will also gradually intensify, intuitively showing that the water flux and separation capacity of the ultrafiltration membrane clear liquid are gradually declining. Conventional physical washing and cleaning cannot completely restore the water flux of the ultrafiltration membrane. In order to ensure the leachate treatment plant Normal and stable ope...

AI Technical Summary

Problems solved by technology

[0005] 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 inorganic dirt wrapped organic dirt, to provide a method that can efficiently remove all kinds of inorganic and organic substances trapped on the pores of ultrafiltration membranes (especially Oils and colloids), the cleaning method of the ultrafiltration membrane to increase the water flow rate of the ultrafiltration membrane, reduce the operating pressure of the ultrafiltration membrane, and ensure the stable operation of the ultrafiltration membrane treatment of landfill leachate

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