title: Applicability of a novel osmotic membrane bioreactor using a specific draw solution in wastewater treatment.
abstract: This study aims to develop a new osmotic membrane bioreactor by combining a moving bed biofilm reactor (MBBR) with forward osmosis membrane bioreactor (FOMBR) to treat wastewater. Ethylenediaminetetraacetic acid disodium salt coupled with polyethylene glycol tert-octylphenyl ether was used as an innovative draw solution in this membrane hybrid system (MBBR-OsMBR) for minimizing the reverse salt flux and maintaining a healthy environment for the microorganism community. The results showed that the hybrid system achieved a stable water flux of 6.94 L/m(2) h and low salt accumulation in the bioreactor for 68 days of operation. At a filling rate of 40% (by volume of the bioreactor) of the polyethylene balls used as carriers, NH4(+)-N and PO4(3-)-P were almost removed (>99%) while producing relatively low NO3(-)-N and NO2(-)-N in the effluent (e.g. <0.56 and 0.96 mg/L, respectively). Furthermore, from analysis based on scanning electron microscopy, Fourier transform infrared spectroscopy, and fluorescence emission-excitation matrix spectrophotometry, there was a thin gel-like fouling layer on the FO membrane, which composed of bacteria as well as biopolymers and protein-like substances. Nonetheless, the formation of these fouling layers of the FO membrane in MBBR-OsMBR was reversible and removed by a physical cleaning technique.
authors: Institute of Environmental Engineering and Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 106, Taiwan, ROC.
authors: Nguyen Cong
authors: NC
authors: Nguyen
authors: Institute of Environmental Engineering and Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 106, Taiwan, ROC. Electronic address: f10919@ntut.edu.tw.
authors: Shiao-Shing
authors: SS
authors: Chen
authors: Institute of Environmental Engineering and Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 106, Taiwan, ROC.
authors: Hau Thi
authors: HT
authors: Nguyen
authors: School of Civil and Environmental Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, Broadway, NSW 2007, Australia. Electronic address: h.ngo@uts.edu.au.
authors: Huu Hao
authors: HH
authors: Ngo
authors: School of Civil and Environmental Engineering, Faculty of Engineering and Information Technology, University of Technology Sydney, Broadway, NSW 2007, Australia.
authors: Wenshan
authors: W
authors: Guo
authors: Institute of Environmental Engineering and Management, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 106, Taiwan, ROC.
authors: Chan Wen
authors: CW
authors: Hao
authors: New Materials Research and Development Dept., China Steel Corporation, Taiwan, ROC.
authors: Po-Hsun
authors: PH
authors: Lin
mesh_terms: D019149:Bioreactors; D008567:Membranes, Artificial; D009995:Osmosis; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater
chemical_list: D008567:Membranes, Artificial; D062065:Wastewater
keywords: Carrier; Draw solution; Forward osmosis; Moving bed biofilm; Osmotic membrane bioreactor