Comparison of the filtration characteristics between attached and suspended growth microorganisms in submerged membrane bioreactor.

An attached growth bioreactor was designed to minimize the effect of suspended microorganisms on membrane fouling in submerged membrane bioreactor. Comparison of mixed liquor from attached and suspended growth systems was made to elucidate major factors giving rise to different filtration characteristics. Unexpectedly, the rate of membrane fouling of the attached growth system was about 7 times higher than that of the suspended growth system despite similar characteristics of soluble fraction from the two reactors. Filtration performance proved to depend on the concentration of mixed liquor suspended solids (MLSS). Better filtration performance with suspended growth was explained by the formation of dynamic membranes with suspended solids. A series of analyses such as hydraulic resistance, specific cake resistance, scanning electron microscope, and atomic force microscope were carried out to elucidate the different filtration characteristics of the two systems.

[1]  K. Yamagiwa,et al.  Performance evaluation of a plunging liquid jet bioreactor with crossflow filtration for small-scale treatment of domestic wastewater , 1994 .

[2]  Jost Wingender,et al.  Microbial extracellular polymeric substances : characterization, structure, and function , 1999 .

[3]  M. Nakajima,et al.  Effect of pore size of ceramic support on the self-rejection characteristics of the dynamic membrane formed with water soluble proteins in waste water. , 1988 .

[4]  Heesu Park,et al.  Flux Enhancement with Powdered Activated Carbon Addition in the Membrane Anaerobic Bioreactor , 1999 .

[5]  Kazuo Yamamoto,et al.  Household Membrane Bioreactor in Domestic Wastewater Treatment , 1993 .

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

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

[8]  H. Chun,et al.  Comparison of ultrafiltration characteristics between activated sludge and BAC sludge , 1998 .

[9]  F. Smith,et al.  COLORIMETRIC METHOD FOR DETER-MINATION OF SUGAR AND RELATED SUBSTANCE , 1956 .

[10]  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 .

[11]  R. Holdich,et al.  Microfiltration using a dynamically formed membrane , 1990 .

[12]  H. Nagaoka,et al.  Influence of bacterial extracellular polymers on the membrane separation activated sludge process , 1996 .

[13]  Pierre Côté,et al.  Immersed membrane activated sludge for the reuse of municipal wastewater , 1997 .

[14]  Kyung Hyun Ahn,et al.  Membrane Filtration Characteristics in Membrane-Coupled Activated Sludge System: The Effect of Floc Structure on Membrane Fouling , 1999 .

[15]  Kwang-Ho Choo,et al.  Membrane fouling mechanisms in the membrane-coupled anaerobic bioreactor , 1996 .

[16]  Anthony G. Fane,et al.  The dynamics of polarisation in unstirred and stirred ultrafiltration , 1984 .

[17]  El Hani Bouhabila,et al.  Microfiltration of activated sludge using submerged membrane with air bubbling (application to wastewater treatment) , 1998 .

[18]  David C. Stuckey,et al.  A REVIEW OF SOLUBLE MICROBIAL PRODUCTS (SMP) IN WASTEWATER TREATMENT SYSTEMS , 1999 .

[19]  Kazuo Yamamoto,et al.  Performance of membrane separation bioreactor at various temperatures for domestic wastewater treatment , 1994 .

[20]  K. Choo,et al.  Effect of anaerobic digestion broth composition on membrane permeability , 1996 .