Abstract: Fluidized carrier biofilm process (FCBR) loading with RIPP patented carriers was utilized to treat refinery saline wastewater. The results prove that FCBR could effectively remove influent chemical oxygen demand (COD), NH3-N and suspended solid from 185-620 mg/L, 18-60 mg/L and 50-520 mg/L to no more than 150 mg/L, 11 mg/L and 80 mg/L，respectively within a hydraulic retention time of 20 h. Comparing with the existing biological treatment system in oil refinery, the new FCBR has a higher efficiency within only a half of a hydraulic retention time. Under the actions of fluidized carrier, biomass concentration doubles that of conventional biofilm processes, and the FCBR effluent quality remains stable and meets the water quality requirement of the subsequent catalytic oxidation processes. Furthermore, the operation of FCBR is easy and low-cost, therefore it has a great potential for commercial application.

Key words: refining wastewater, biofilm, fluidized carrier, COD, NH3-N, suspended solid