In this study, the effect of zeolite powder addition on submerged memb rane bioreactor(SMBR) on membrane permeability, and the removals for COD, NH3-N, TN were investigated. Through the parallel operation of control and test system s, it was found that the zeolite powder addition could alleviate the ultra-filtr ation membrane fouling and enhance the membrane permeability. On the basis of ex perimental investigations, a concept of “protection coating layer” was propose d to illustrate the phenomenon of UF membrane fouling. In addition, the removal for COD in test system was more stable, a little higher compared to the control system. Due to the combination of nitrification and ion exchange, a more excelle nt removal for NH3-N in test system was obtained regardless of influent NH3-N lo ading rate. It was also found that a mean 25% higher TN removal took place in th e test system, and ion exchange and simultaneous nitrification and de-nitrificat ion were analyzed to be main factors. During the stable operation period, the SO URs of test zeolite powder added sludge and control activated sludge were measur ed to be 75 mgO2/(gMLVSS·h) and 24 mgO2/(gMLVSS·h) res- pectively, it meant th at the zeolite powder addition could enhance the microorganism activity signific antly.
展开▼
