Abstract
process Abstract. The research progress of membrane fouling control method in water treatment is introduced by four aspects of solution environment, hydraulics condition, membrane property and strengthening coupling process. Former two influence membrane fouling process by changing system charge and membrane surface shear stress. Modified anti-fouling membrane could be achieved by membrane structure improvement, hydrophilic modification and membrane charge modification. The modified method can be divided into casting solution modification and membrane surface modification. Point out that the research of membrane fouling on-line control method should be focus on the preparation of high performance modifiers. Membrane fouling mechanism In the process of osmotic solution formation by filtrating solvent, concentration of pollution near the membrane surface is increased and the concentration polarization is formed; contaminants adsorption and blocking of membrane pores on the membrane surface formed irreversible membrane fouling. In the process of filtering the solution, the above three kinds of conditions will cause the increase of membrane resistance and flux decline with the increase of the filtration time. Membrane fouling was decided by electrostatic forces, hydrogen bonding , dipole moment and Kulun force between contaminant and membrane; pollutant charge effect and size effect are two main factors that affect membrane fouling.
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