How to clean the ultrafiltration membrane of small and medium-sized purified water treatment equipme

How to clean the ultrafiltration membrane of small and medium-sized purified water treatment equipment?

by:Ocpuritech     2021-05-07
How to clean the ultrafiltration membrane of small and medium-sized purified water treatment equipment? Author: Today, the city water is worrying, each industrial process water trapped, and the water industry research and development of small and medium purification water treatment equipment raw water can be filtered to remove sediment, chlorine and various bacterial impurities, to meet the business Water standard for production. The retention mechanism of the ultrafiltration membrane for macromolecular substances is mainly the sieving effect, and the size and shape of the pores on the surface active layer of the membrane are mainly determined by the retention effect. In addition to the sieving effect, the adsorption on the surface of the membrane and the micropores and the retention of particles in the membrane pores also cause macromolecules to be retained. If the ultrafiltration membrane is contaminated, the separation of macromolecular substances from colloidal substances and solvents cannot be achieved. At this time, the ultrafiltration membrane needs to be cleaned. So how do we judge whether the ultrafiltration membrane of small and medium-sized purified water treatment equipment needs to be cleaned? (1) According to the change of the inlet and outlet pressure value of the ultrafiltration device: in most cases, when the pressure value exceeds the initial value of 0.05 MPa, it indicates that the fluid resistance has been Obviously increase, as daily management can use isobaric large flow flushing method. If it is invalid, choose chemical cleaning method. (2) According to the change of permeable water volume or permeable water quality: when the permeated water volume or permeable water quality of the ultrafiltration system drops to an unacceptable level, it means that the permeated water flow path is blocked, or the membrane separation is affected by concentration polarization. Performance. In this case, a combination of physical and chemical cleaning methods are often used, that is, physical methods are quickly rinsed to remove a large amount of pollutants, and then chemical methods are used to clean to save chemicals. (3) Regular cleaning: The ultrafiltration system in operation can adopt periodic regular cleaning according to the law of membrane contamination, or manual cleaning. For large industrial installations, it is advisable to set the time and time for cleaning in order through the automatic control system.
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