Off-line cleaning method of submerged ultrafiltration membrane stack

Abstract

The invention discloses an offline cleaning method for an immersion type ultrofiltration membrane stack. According to the offline cleaning method, the ultrofiltration membrane stack is subjected to offline cleaning through acid cleaning, alkali cleaning and back washing, and a pipeline system of an online membrane pool can be simplified; ultrasonic treatment is adopted in the cleaning process, and the cleaning effect is good; the cleaning process of the ultrofiltration membrane stack is automatically completed through a controller, a mechanical arm and an ultrasonic unit, the control accuracy of the cleaning process is good, and the cleaning efficiency is high.

Description

Technical field [0001] The invention relates to the technical field of membranes for water supply and wastewater treatment and purification, in particular to an offline cleaning method of an immersed ultrafiltration membrane stack. Background technique [0002] The related technical background of the present invention is described below, but these descriptions do not necessarily constitute the prior art of the present invention. [0003] Membrane separation technology is a new type of separation technology that uses the selective permeability properties of the membrane to separate, purify and concentrate the target product. When the membrane separation technology is applied, the particles, colloidal ions or solute macromolecules in the material have physical and chemical or mechanical interactions with the membrane, thereby adsorbing and depositing on the membrane surface or in the membrane pores, causing the membrane pore size to decrease or block, and membrane fouling occurs. As...

AI Technical Summary

Problems solved by technology

This online cleaning method will have an impact on the original membrane water purification facilities and systems, and has high requirements on the ability of the membrane pool to resist acid and alkali corrosion, especially in the membrane pool structure of a large system. It is difficult to treat the cleaning wastewater in a timely manner, and the return of the wastewater to the front-end treatment facilities will also affect the operation effect of the front-end treatment. Moreover, the restorative chemical cleaning is not carried out continuously, usually one week to one month, and the waste water generated in this way is discontinuous and large. The impact load on the corresponding water treatment system is large, and the amount of chemical agents is also large, the reuse rate of chemical cleaning fluid is low, and the cost of maintenance and cleaning is high

Images