Enhancement of biofilm formation onto surface-modified hollow-fiber membranes and its application to a membrane-aerated biofilm reactor.

摘要: Surface-modified hollow-fiber membranes were prepared by radiation-induced grafting of an epoxy-group-containing monomer, glycidylmethacrylate (GMA), onto a polyethylene-based fiber (PE-fiber). The epoxy ring GMA was opened introduction diethylamine (DEA). bacterial adhesivity to this material (DEA-fiber) tested immersion into nitrifying suspension. initial adhesion rates and the amount attached bacteria DEA-fiber 6-10-fold 3-fold greater than those PE fiber, respectively. A membrane-aerated biofilm reactor (MABR) composed DEA fibers developed for partial nitrification with nitrite accumulation. Prior test, it confirmed that oxygen supply rate (OSR) proportional air pressure up 100 kPa, allowing easy control supply. Stable accumulation observed in test at fixed throughout operation period, indicating consumed only ammonia oxidizers. Furthermore, demonstrated utilization efficiency (OUE) oxidation process nearly 100% after 300 h incubation.