Method for realizing water treatment by using pressure type continuous membrane filtering system

Abstract

The invention discloses a method for realizing water treatment by using a pressure type continuous membrane filtering system and provides a method which can be used for enhancing the air and water double-washing effect, increasing the recovery rate of the produced water and prolonging the washing period. At an air and water double-washing stage, filtered water with a small flow is reversely filled inside a membrane fiber, meanwhile, compressed air is introduced from the bottom end of a membrane component, and backwashing water reversely washes and permeates out of the membrane fiber to form a rotary air and water current together with the compressed air, so that the membrane fiber in the position is sufficiently and doubly washed; and the formed rotary air and water current for washing rises along with the gradual rise of the water level inside the membrane component, and pollutants and impurities are washed through washing membrane fibers in different positions and the inner wall of the membrane component from bottom to top. The integral membrane fiber is uniformly washed by using the rotary air and water current for washing, so that the aeration intensity and aeration time of the integral membrane fiber are more uniform in distribution, the washing effect is improved, the membrane washing period is prolonged, the service life of a membrane is prolonged, and the system is more stable in operation.

Description

Technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for realizing water treatment by using a pressure type continuous membrane filtration system. Background technique [0002] In the field of water treatment technology, pressure-type continuous membrane filtration systems are widely used in water purification. The system takes hollow fiber ultrafiltration membrane as the central processing unit. In the process of purifying water, the treatment liquid passes through the membrane surface at a certain flow rate, and water molecules penetrate the membrane under a certain pressure, while suspended matter, colloids, and macromolecules Organic matter and microorganisms are blocked to achieve the purpose of purification and separation. The intercepted impurities gradually accumulate on the outer surface of the membrane wall, continuously causing water flow resistance through the membrane wall. Powerful cleaning with air or w...

AI Technical Summary

Problems solved by technology

The air-water double washing stage in the traditional operation process is continuous aeration at a constant high liquid level, which tends to cause great differences in the aeration intensity of the membrane filaments in the horizontal and vertical directions. The membrane filaments with severe aeration are easy to wear and the aeration intensity Inadequate cleaning of weaker membrane filaments

Moreover, backwashing with a large flow rate makes the self-water rate of the membrane system too high, the recovery rate is low, and the energy consumption per unit mass of water is increased.

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