Influence of supporting media in suspension on membrane fouling reduction in submerged membrane bior

Abstract In this study, the SMBR was compared in terms of membrane fouling with and without the addition of suspended medium in the membrane reactor. The effectiveness of medium in suspension in submerged membrane bioreactor (SMBR) was evaluated at different filtration flux. The SMBR was operated at a flux of 5–30 L/m 2  h (corresponding hydraulic retention time of 10–1.7 h) with and without suspended medium. The suspended medium used in this study was granular activated carbon (GAC; particle size 300–600 mm) at air scouring (aeration) rates of 0.5–1.5 m 3  m −2 membrane area h −1 . At higher aeration rate of 1.5 m 3 /m 2 membrane area h, the effect of flux on membrane resistance was found to be negligible. The reduction of aeration rate from 1.5 to 1.0 m 3  m −2 membrane area h −1 resulted in a sudden rise of TMP. The addition of suspended medium prevented a sudden rise of TMP (total membrane resistance reduced from 51 × 10 11 to 20 × 10 11  m −1 ). The organic removal efficiency remained high irrespective of flux. The molecular weight distribution (MWD) and excitation emission matrix (EEM) analysis of SMBR effluent showed a range of organic (composed of amino acids, biopolymers, humics and fulvic acids type substances) removed by the GAC both by scouring and adsorption mechanisms.

[1]  J. Kandasamy,et al.  Identification and characterisation of biofilm formed on membrane bio-reactor , 2009 .

[2]  M. Spérandio,et al.  Study of a hybrid process: Adsorption on activated carbon/membrane bioreactor for the treatment of an industrial wastewater , 2008 .

[3]  Aline F Viero,et al.  Is hydraulic retention time an essential parameter for MBR performance? , 2008, Journal of hazardous materials.

[4]  In-Soung Chang,et al.  Effect of membrane fouling reducer on cake structure and membrane permeability in membrane bioreactor , 2007 .

[5]  Duu-Jong Lee,et al.  Intra-layer flow in fouling layer on membranes , 2007 .

[6]  G. L. Sant'anna,et al.  The use of polyetherimide hollow fibres in a submerged membrane bioreactor operating with air backwashing , 2007 .

[7]  Vicki Chen,et al.  Fibre movement induced by bubbling using submerged hollow fibre membranes , 2006 .

[8]  Alain Grasmick,et al.  Membrane bioreactor fouling in sub-critical filtration conditions: a local critical flux concept , 2004 .

[9]  Richard M. Stuetz,et al.  Characterisation of polymeric fouling in membrane bioreactors and the effect of different filtration modes , 2007 .

[10]  Xia Huang,et al.  Using inorganic coagulants to control membrane fouling in a submerged membrane bioreactor , 2006 .

[11]  Tatsuki Ueda,et al.  Effects of aeration on suction pressure in a submerged membrane bioreactor , 1997 .

[12]  Fenglin Yang,et al.  A comprehensive study on membrane fouling in submerged membrane bioreactors operated under different aeration intensities , 2008 .

[13]  S. Liang,et al.  Soluble microbial products in membrane bioreactor operation: Behaviors, characteristics, and fouling potential. , 2007, Water research.

[14]  David C. Stuckey,et al.  Flux and performance improvement in a submerged anaerobic membrane bioreactor (SAMBR) using powdered activated carbon (PAC) , 2008 .

[15]  Pierre Le-Clech,et al.  Fouling in membrane bioreactors used in wastewater treatment , 2006 .

[16]  H. Ngo,et al.  Effect of operating parameters in a submerged membrane adsorption hybrid system: experiments and mathematical modeling , 2005 .

[17]  K. Booksh,et al.  Fluorescence excitation-emission matrix regional integration to quantify spectra for dissolved organic matter. , 2003, Environmental science & technology.

[18]  El Hani Bouhabila,et al.  Fouling characterisation in membrane bioreactors , 2001 .

[19]  Rui Liu,et al.  Hydrodynamic effect on sludge accumulation over membrane surfaces in a submerged membrane bioreactor , 2003 .

[20]  Chung-Hak Lee,et al.  Effect of Powdered Activated Carbon on the Performance of an Aerobic Membarane Bioreactor: Comparison between Cross‐Flow and Submerged Membrane Systems , 2003, Water environment research : a research publication of the Water Environment Federation.

[21]  A. Fane,et al.  The use of gas bubbling to enhance membrane processes , 2003 .