Continuous operation of membrane bioreactor treating toluene vapors by Burkholderia vietnamiensis G4

Removal of gaseous toluene by the combination of photocatalytic oxidation under complex light irradiation of UV and visible light and biological process

“…The biofiltration of toluene was studied by some previous researchers [27][28][29][30]. Toluene can be effectively treated in a composite membrane bioreactor with a selected aerobic mixed culture [31] or a laboratory-scale biofilm membrane bioreactor inoculated with Burkholderia vietnamiensis G4 [32]. But, photocatalysis may cause secondary pollution during the photocatalysis degradation, various intermediates are formed and some of them can be more toxic and in some cases more persistent than the parent compound [33]; the main by-products in the gas-phase resulting from photocatalytic oxidation of toluene were benzaldehyde, methanol, acetaldehyde, acetone/propionaldehyde, formic acid/ethanol and acetic acid, benzoic acid, hydroquinone, benzylic alcohol, and cresols [34][35].…”

Biocatalytic membrane reactors for the removal of recalcitrant and emerging pollutants from wastewater

“…A commercially available composite membrane, which has been used in most studies on hydrogen-based MBfRs (Lee and Rittmann, 2000 ), consists of a 1-μ m thick non-porous polyurethane layer sandwiched between two microporous polyethylene layers. Several biofi lter MBfR studies have used composite membranes consisting of a porous layer coated with polydimethylsiloxane (PDMS) (De Bo et al ., 2002 ;Jacobs et al ., 2004 ;Kumar et al ., 2008Kumar et al ., , 2009van Langenhove et al ., 2004 ).…”

“…The wastewater is either fed sequentially from the oxygen-based Polypropylene porous fl at sheet Reij et al ., 1995 ;Reij et al ., 1997 Toluene Polyethylene porous hollow fi bers Ergas and McGrath, 1997;Ergas et al ., 1999 Toluene Polysulfone porous hollow fi bers Parvatiyar et al ., 1996a Toluene PVDF coated with PDMS non-porous fl at sheet Jacobs et al ., 2004 Toluene Polyethylene porous hollow fi bers Kim and Kim, 2005 ;Song et al ., 2007 Toluene Polyacrylonitrile coated with PDMS non-porous fl at sheet Kumar et al ., 2008 ;Kumar et al ., 2009 Toluene, dichloromethane Polypropylene porous membrane Hartmans et al ., 1992 Livingston, 1994a;Livingston, 1994 1,2-dichloroethane Silicone rubber tubing Freitas dos Santos and Livingston, 1994 Toluene Silicone rubber tubing Emanuelsson et al ., 2003Phenol Polypropylene Chung et al ., 2004 Poly-dimethyl siloxane and poly-methyl-vinyl siloxane Xiao et al ., 2006 Phenol Polyvinylidene fl uoride Juang et al ., 2009 Benzene, toluene, and xylene Poly-dimethyl siloxane Mehdizadeh et al ., 2011 to the hydrogen-based MBfR or recirculated between the two modules (Cowman et al ., 2005 ;Hwang et al ., 2009aHwang et al ., , 2010Shin et al ., 2005Shin et al ., , 2008Smith et al ., 2008 ). Smith et al .…”

Bacterial Dynamics of Biofilm Development During Toluene Degradation by Burkholderia vietnamiensis G4 in a Gas Phase Membrane Bioreactor

“…For all the experiments described herein, the MBR was rinsed with ethanol, and the mineral medium and heat-resistant reactor parts were autoclaved prior to the experiments. The experimental set-up used in this study has been previously described [10].…”