Regeneration method of performance of immersion-type ultrafiltration membrane used in reclaimed water recycling

Abstract

The invention relates to a regeneration method of the performance of an immersion-type ultrafiltration membrane used in reclaimed water recycling. According to the invention, aiming at pollution form and pollutant of immersion-type membrane in reclaimed water deep process, a membrane function regeneration method which is a combination of physical method and various chemical methods is determined. The method mainly comprises gas and water backwashing, scrubbing, and chemical washing methods with different periods and different times. Therefore, ultrafiltration membrane function is restoratively regenerated, and production water amount requirement is satisfied. The method can be implemented frequently and regularly, and greatly assists in productions. The regeneration effect is good, and the method is simple and feasible. The method is suitable to be popularized in water processing industries.

Description

Technical field [0001] The invention relates to a method for regenerating the performance of a submerged ultrafiltration membrane in reclaimed water reuse, which belongs to the technical field of sewage reuse filtration. Background technique [0002] At present, in the sewage desalination technology, the double membrane method, namely ultrafiltration + reverse osmosis technology, is widely used. Among them, there are many types of ultrafiltration membranes, which can be divided into pressure type and submerged type according to different manufacturing methods. The advantages of submerged ultrafiltration are strong anti-pollution ability, good pollution holding capacity, energy saving, and high level of automation. [0003] The role of the ultrafiltration system is to remove suspended solids in the water, including impurities such as colloids and bacteria, and provide qualified influent for reverse osmosis to ensure that the turbidity of the reverse osmosis influent is less than 0.2...

AI Technical Summary

Problems solved by technology

When submerged ultrafiltration treats reclaimed water, there are residual or newly polluted fine particulate matter in the water, as well as colloids, organic matter and microorganisms, etc., and the ultrafiltration membrane is intercepted and filtered out by the membrane wire after it has been in operation for a period of time or after a certain amount of sewage has been processed. These pollutants will contaminate and block the membrane pores, causing the pressure difference before and after the sewage passes through the membrane to gradually increase, the water flux will gradually decrease, and even affect the total water production, which cannot meet the water consumption requirements required for production.