Effect of hydrophilic foamed copper on dynamic membrane formation in dynamic membrane bioreactor (DMBR)

The effect of hydrophilic membrane material on the formation of dynamic membrane (DM) was investigated, by using a membrane module combined with a hydrophilic modified foam copper with 0-10 mm of thickness, 300 μm of pore size and an activated carbon sponge with 10 mm of thickness. The appropriate thickness of the hydrophilic membrane was selected to treat the refining wastewater. Hydrophilic modification and membrane formation experiments showed that water molecules were easier to spread on the surface of the foam copper, which could reduce the accumulation of sludge layer on the surface of the membrane module and increase the effluent's stability of the combined membrane module. Under experimental conditions, the proper thickness of the foam copper was 5 mm, the sludge layer thickness on the membrane surface was close to 0mm, and the effluent flux was stabled as 44 L/(m²⋅h), which was higher than that of the activated carbon sponge without using the hydrophilic foam copper, increased by 107%. Wastewater treatment results showed that the removal rate of COD in the DMBR system was 95.6%, and the removal rate of ammonia nitrogen was 98.5%.