Effect of cyclic aeration on fouling in submerged membrane bioreactor for wastewater treatment.

Due to the inefficiency of aeration measures in preventing fouling by soluble and colloidal particles. The effect of alternating high/low cyclic aeration mode on the membrane fouling in the submerged membrane bioreactor was studied by comparing to fouling in a constant aeration mode. Results indicated a higher overall fouling rate in the cyclic aeration mode than in the constant aeration. However, a higher percentage of reversible fouling was observed for the cyclic aeration mode. The membrane permeability can be more easily recovered from physical cleaning such as backwashing in the cyclic aeration mode. The activated sludge floc size distribution analysis revealed a floc destruction and re-flocculation processes caused by the alternating high/low aeration. The short high aeration period could prevent the destruction of strong strength bonds within activated sludge flocs. Therefore, less soluble and colloidal material was observed in the supernatant due to the preservation of the strong strength bonds. The weak strength bonds damaged in the high aeration period could be recovered in the re-flocculation process in the low aeration period. The floc destruction and re-flocculation processes were suggested to be the main reason for the low irreversible fouling in the cyclic aeration mode.

[1]  M. Spérandio,et al.  Side-stream membrane bioreactors: Influence of stress generated by hydrodynamics on floc structure, supernatant quality and fouling propensity. , 2010, Water research.

[2]  M. Engelhard,et al.  Role of extracellular polymeric substances in bioflocculation of activated sludge microorganisms under glucose-controlled conditions. , 2010, Water research.

[3]  Paul Lant,et al.  Impacts of structural characteristics on activated sludge floc stability. , 2003, Water research.

[4]  Michael J. Hounslow,et al.  Population balance modelling of activated sludge flocculation : Investigating the size dependence of aggregation, breakage and collision efficiency , 2006 .

[5]  Paul Lant,et al.  Modelling activated sludge flocculation using population balances , 2002 .

[6]  Robert H. Davis,et al.  Effects of Added Yeast on Protein Transmission and Flux in Cross‐Flow Membrane Microfiltration , 1999, Biotechnology progress.

[7]  V. Chen,et al.  Reversibility of heterogeneous deposits formed from yeast and proteins during microfiltration , 2005 .

[8]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[9]  Kai Zhang,et al.  Effect of Permeate Flux and Tangential Flow on Membrane Fouling for Wastewater Treatment , 2005 .

[10]  A. Grasmick,et al.  Critical particle size in membrane bioreactors Case of a denitrifying bacterial suspension , 2000 .

[11]  Adrienne Menniti,et al.  The influence of aeration intensity on predation and EPS production in membrane bioreactors. , 2010, Water research.

[12]  A. Wheatley,et al.  Assessing activated sludge morphology by laser and image analysis , 2010 .

[13]  D. Sponza.  Extracellular polymer substances and physicochemical properties of flocs in steady and unsteady-state activated sludge systems , 2002 .

[14]  In-Soung Chang,et al.  Membrane filtration characteristics in membrane-coupled activated sludge system -- the effect of physiological states of activated sludge on membrane fouling , 1998 .

[15]  R. Field,et al.  Crossflow filtration of washed and unwashed yeast suspensions at constant shear under nominally sub-critical conditions , 2006 .

[16]  J. Darby,et al.  Extracellular polyanions in digested sludge: Measurement and relationship to sludge dewaterability , 1997 .

[17]  K. Ahn,et al.  Treatment of household wastewater using an intermittently aerated membrane bioreactor , 1999 .

[18]  Robert H. Davis,et al.  Microfiltration of protein mixtures and the effects of yeast on membrane fouling , 1999 .

[19]  Simon Judd,et al.  The Impact of Intermittent Aeration on the Operation of Air‐Lift Tubular Membrane Bioreactors under Sub‐Critical Conditions , 2006 .

[20]  X. Y. Li,et al.  Influence of loosely bound extracellular polymeric substances (EPS) on the flocculation, sedimentation and dewaterability of activated sludge. , 2007, Water research.

[21]  H. Nagaoka,et al.  Influence of extracellular polymeric substances on nitrogen removal in an intermittently-aerated membrane bioreactor. , 2005, Water science and technology : a journal of the International Association on Water Pollution Research.

[22]  T. Arnot,et al.  In situ manipulation of critical flux in a submerged membrane bioreactor using variable aeration rates, and effects of membrane history , 2004 .

[23]  J. Bottero,et al.  Characterization of activated sludge flocs structure , 1997 .

[24]  K. Choo,et al.  Hydrodynamic behavior of anaerobic biosolids during crossflow filtration in the membrane anaerobic bioreactor , 1998 .

[25]  Jun Wu,et al.  Modeling of the submerged membrane bioreactor fouling by the combined pore constriction, pore blockage and cake formation mechanisms , 2011 .

[26]  I. Chang,et al.  Effect of pump shear on the performance of a crossflow membrane bioreactor. , 2001, Water research.

[27]  B Jefferson,et al.  A review of floc strength and breakage. , 2005, Water research.

[28]  Xia Huang,et al.  Effect of DO concentration on biofilm structure and membrane filterability in submerged membrane bioreactor. , 2006, Water research.

[29]  Effects of shear stress on the secretion of extracellular polymeric substances in biofilms , 2005 .

[30]  Anja Drews,et al.  Membrane fouling in membrane bioreactors—Characterisation, contradictions, cause and cures , 2010 .

[31]  D. Jeison,et al.  Cake formation and consolidation: Main factors governing the applicable flux in anaerobic submerged membrane bioreactors (AnSMBR) treating acidified wastewaters , 2007 .

[32]  Chengda He,et al.  Modeling membrane fouling in a submerged membrane bioreactor by considering the role of solid, colloidal and soluble components , 2012 .

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

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

[35]  C. He,et al.  Experimental and modeling investigation of sewage solids sedimentation based on particle size distribution and fractal dimension * , 2009 .

[36]  John C. Russ,et al.  The Image Processing Handbook , 2016, Microscopy and Microanalysis.

[37]  A. Grasmick,et al.  Floc size distribution in a membrane bioreactor and consequences for membrane fouling , 1998 .

[38]  S. Delgado,et al.  Effect of the shear intensity on fouling in submerged membrane bioreactor for wastewater treatment , 2008 .

[39]  Silke Schiewer,et al.  Long-term study of an intermittent air sparged MBR for synthetic wastewater treatment , 2005 .

[40]  Menachem Elimelech,et al.  Influence of shear on the production of extracellular polymeric substances in membrane bioreactors. , 2009, Water research.

[41]  A. Wheatley,et al.  Characterizing activated sludge process effluent by particle size distribution, respirometry and modelling , 2009 .

[42]  T. Mino,et al.  Microbial community structure in activated sludge floc analysed by fluorescence in situ hybridization and its relation to floc stability. , 2008, Water research.

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