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Method To Reduce The MBR Membrane's Fouling
- Dec 27, 2017 -

Method to reduce the MBR membrane's fouling


According to membrane material and membrane separation characteristics, MBR design, process to equipment operation and operation of all aspects to be considered, so that concentration polarization and membrane pollution to a minimum. Based on theoretical research and practical application both at home and abroad, many effective experiences and methods of mitigating MBR membrane pollution have been accumulated.


(1) Effective pretreatment of feed liquid

Effective pretreatment of the feed (raw water) to improve the water quality of the membrane module influent, such as pre-flocculation, pre-filtration or change the pH value of the solution to remove some of the solutes that can interact with the membrane.


(2) change the membrane fluid mechanics conditions

Improve the hydrodynamic conditions on the side of the liquid near the membrane surface, such as increasing the flow rate of the influent water or using cross-flow methods to reduce the concentration polarization and keep the trapped solute away from the water in time. In addition, starting from the reactor configuration, research and development of new membrane biofilm technologies that are conducive to membrane fouling control, such as adding activated carbon into conventional MBR, combining membrane technology with biological fluidized bed to form membrane biofluidized bed process, and the like.


(3) Membrane material improvement and optimization of membrane modules

Membrane material, pore size and hydrophilic membrane surface to a certain extent affect the rate of membrane fouling. Commonly used MBR membrane materials are poly SA, polypropylene resin, polyvinylidene fluoride, polyolefins and so on. The study also found that the properties of membrane modules, such as the tightness, length and diameter of membrane filaments, also have an influence on the membrane filtration performance. Therefore, membrane assembly design is also an effective way to delay membrane fouling.