title: The performance of a biological aerated filter loaded with a novel non-sintered fly-ash ceramsite as pretreatment for dual membrane processes.
abstract: This work focused on wastewater reclamation of secondary treated ethylene chemical plant effluent, which contained high conductivity and high organic concentration. To reduce the cost and improve operation stability, a biological aerated filter-ultrafiltration-reverse osmosis (BAF-UF-RO) process was proposed. The feasibility and effectiveness of BAF loaded with a novel non-sintered fly-ash ceramsite (NSFC) as a pretreatment method of a dual membrane system were investigated in detail. The results showed that the CODCr, turbidity, NH3-N and the silt density index (SDI) in the effluent from the BAF were reduced to 24.2 mg/L, 12.17 NTU, 0.42 mg/L and 7.52, respectively, and most of the organic compounds were biodegraded. The BAF-UF-RO process was stable with a recovery rate of 75%, and the desalination rate was up to about 97.5%. Compared with the UF-RO process, the operating pressure and backwash frequency decreased from 1.12-1.26 Mpa and 3 times/d to 0.94-0.98 Mpa and 2 times/d, respectively. After continuous operation for four months, there appeared to be no need for chemical cleaning of the RO membrane. Moreover, the analysis results of X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy proved that there was only slight membrane fouling, which was mainly colloidal blocking caused by refractory organic compound.
authors: a Department of Environmental Engineering, School of Chemical Engineering , University of Science and Technology Liaoning , 185 Anqian Road, Anshan 114051 , People's Republic of China.
authors: Lihua
authors: L
authors: Li
authors: Chaowu
authors: C
authors: Hu
authors: Xiulan
authors: X
authors: Dai
authors: Wenjie
authors: W
authors: Jin
authors: Cheng
authors: C
authors: Hu
authors: Fang
authors: F
authors: Ma
mesh_terms: D000388:Air; D001419:Bacteria / Q000378:metabolism*; D060729:Coal Ash / Q000737:chemistry*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008567:Membranes, Artificial; D059027:Recycling / Q000379:methods; D012987:Soil / Q000737:chemistry; D014462:Ultrafiltration / Q000295:instrumentation*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000378:metabolism; D018508:Water Purification / Q000295:instrumentation*
chemical_list: D060729:Coal Ash; D008567:Membranes, Artificial; D012987:Soil; D014874:Water Pollutants, Chemical
keywords: biological aerated filter; membrane fouling; non-sintered fly-ash ceramsite; reverse osmosis; ultrafiltration