title: Treatment of petroleum refinery wastewater using a sequential anaerobic-aerobic moving-bed biofilm reactor system based on suspended ceramsite.
abstract: In this study, a novel suspended ceramsite was prepared, which has high strength, optimum density (close to water), and high porosity. The ceramsite was used to feed a moving-bed biofilm reactor (MBBR) system with an anaerobic-aerobic (A/O) arrangement to treat petroleum refinery wastewater for simultaneous removal of chemical oxygen demand (COD) and ammonium. The hydraulic retention time (HRT) of the anaerobic-aerobic MBBR system was varied from 72 to 18 h. The anaerobic-aerobic system had a strong tolerance to shock loading. Compared with the professional emission standard of China, the effluent concentrations of COD and NH3-N in the system could satisfy grade I at HRTs of 72 and 36 h, and grade II at HRT of 18 h. The average sludge yield of the anaerobic reactor was estimated to be 0.0575 g suspended solid/g CODremoved. This work demonstrated that the anaerobic-aerobic MBBR system using the suspended ceramsite as bio-carrier could be applied to achieving high wastewater treatment efficiency.
authors: School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jiangxi Province, China. bjmanglu@163.com
authors: Mang
authors: M
authors: Lu
authors: Li-Peng
authors: LP
authors: Gu
authors: Wen-Hao
authors: WH
authors: Xu
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D018441:Biofilms; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002617:Chemical Industry; D010578:Petroleum; D062065:Wastewater; D018508:Water Purification / Q000379:methods*
chemical_list: D010578:Petroleum; D062065:Wastewater