Performance of An Airlift Membrane Bioreactor Under Different Aeration Rates
DOI:
https://doi.org/10.6000/1929-6037.2012.01.02.9Keywords:
Airlift MBR, Aeration, EPS, Fouling, Mass transfer coefficient, Oxygen uptake rateAbstract
The treatment of a synthetic oily wastewater in an airlift submerged membrane bioreactor (AMBR) has been studied. A flat sheet Kubota membrane has been used for this purpose in the reactor with a working volume of 19 L. The volumetric oxygen transfer coefficient, oxygen uptake rate, treatment efficiency and fouling intensity were investigated for various aeration rates (0.2, 0.5, 0.7 and 1 m3/h). Based on the results, a COD removal efficiency of more than 93% - even for the lowest aeration rate – is reported. However, increasing the aeration rate resulted in higher kLa and higher microbial activity. The high aeration intensity resulted in breakage of activated sludge flocs and hence reduction in mean flocs size and release of extracellular polymeric substances (EPS). At an aeration intensity as high as 1m3/h, the maximum irreversible fouling was observed which is due to higher concentration of EPS and colloids that are the major foulants. Although the aeration may scour the membrane surface and avoid the formation of cake layer, it could induce more pore blocking fouling. In the studied range, the 0.7 m3/h is found to be the optimum aeration rate and the alteration of the aeration rate deteriorated the AMBR’s performance.
References
Stephenson T, Brindle K, Judd S, Jefferson B. Membrane bioreactors for wastewater treatment. London: IWA Publishing; 2000.
Germain E, Stephenson T. Biomass characteristics, aeration and oxygen transfer in membrane bioreactors: Their interrelations explained by a review of aerobic biological processes. Envir Sci and Bio/Tech 2005; 4: 223-33.
Judd S. The MBR Book: Principles and applications of membrane bioreactors in water and wastewater treatment. Oxford: Elsevier; 2006.
Nywening J, Zhoub H. Influence of filtration conditions on membrane fouling and scouring aeration effectiveness in submerged membrane bioreactors to treat municipal wastewater. Water Res 2009; 43: 3548-3558. http://dx.doi.org/10.1016/j.watres.2009.04.050
Sofia A, Ng WJ, Ong SL. Engineering design approaches for minimum fouling in submerged MBR. Desalination 2004; 160: 67–74. http://dx.doi.org/10.1016/S0011-9164(04)90018-5
Khalili-Garakani A, Mehrnia MR, Mostoufi N, Sarrafzadeh MH. Analyze and control fouling in an airlift membrane bioreactor: CFD simulation and experimental studies. Process Biochem 2011; 46: 1138-45. http://dx.doi.org/10.1016/j.procbio.2011.01.036
Mafirad S, Mehrnia MR, Azami H, Sarrafzadeh MH. Effects of biofilm formation on membrane performance in submerged membrane bioreactors. Biofouling 2011; 27: 477–85. http://dx.doi.org/10.1080/08927014.2011.584619
Krause S, Cornel P, Wagner M. Comparison of different oxygen transfer testing procedures in full-scale membrane bioreactors. Water Sci Technol 2003; 47: 169-76.
Churchouse S. Membrane Bioreactors: Going from Laboratory to Large Scale –Problems to Clear Solutions, In: Presented at membranes and the environment. University of Oxford, 2002; 14-17 July.
Fletcher H, Mackley T, Judd S. The cost of a package plant membrane bioreactor. Water Res 2007; 41: 2627-35. http://dx.doi.org/10.1016/j.watres.2007.02.038
Mueller JA, Boyle WC, Popel HJ. Aeration: principles and practice. Boca Raton: CRC Press; 2002.
Garcia-Ochoa F, Gomez E. Bioreactor scale-up and oxygen transfer rate in microbial processes: An overview. Biotechnol Adv 2009; 27:153–76. http://dx.doi.org/10.1016/j.biotechadv.2008.10.006
Ozbek B, Gayik S. The studies on the oxygen mass transfer coefficient in a bioreactor. Process Biochem 2001; 36: 729-41. http://dx.doi.org/10.1016/S0032-9592(00)00272-7
Germain E, Nellesb F, Drews A, Pearcec P, Kraumeb M, Reida E, et al. Biomass effects on oxygen transfer in membrane bioreactors. Water Res. 2007; 41:1038–1044. http://dx.doi.org/10.1016/j.watres.2006.10.020
Hasar H, Kinaci C. Empirical model representing microbial activity in a submerged MBR treating strength wastewater. Desalination 2004; 170: 161-67. http://dx.doi.org/10.1016/j.desal.2004.02.097
Drews A, Vocks M, Iversen I, Lesjean B, Kraume M. Influence of unsteady membrane bioreactor operation on EPS formation and filtration resistance. Desalination 2006; 192: 1-9. http://dx.doi.org/10.1016/j.desal.2005.04.130
Yun MA, Yeon KM, Park JS, Lee CH, Chun JS, Lim DJ. Characterization of biofilm structure and its effect on membrane permeability in MBR for dye wastewater treatment. Water Res 2006; 40: 45–52. http://dx.doi.org/10.1016/j.watres.2005.10.035
Azami H, Sarrafzadeh MH, Mehrnia MR. Fouling in membrane bioreactors with various concentrations of dead cells. Desalination 2011; 278: 373–80. http://dx.doi.org/10.1016/j.desal.2011.05.052
APHA. Standard methods for the examination of water and wastewater. 19th ed. Baltimore: American Public Health Association; 1995.
Le-Clech P, Chen V, Fane T. Fouling in membrane bioreactors used in wastewater treatment. J Membr Sci 2006; 284:17–53. http://dx.doi.org/10.1016/j.memsci.2006.08.019
Drews A. Membrane fouling in membrane bioreactors characterization, contradictions, cause and cures. J Membr Sci 2010; 363: 1-28. http://dx.doi.org/10.1016/j.memsci.2010.06.046
Lesjean B, Rosenberger S, Laabs C, Jekel M, Gnirss R, Amy G. Correlation between membrane fouling and soluble/colloidal organic substances in membrane bioreactors for municipal wastewater treatment, WEMT, Seoul, 2004.
Meng F, Yang F, Shi B, Zhang H. A comprehensive study on membrane fouling in submerged membrane bioreactors
operated under different aeration intensities. Sep Purif Technol 2008; 59: 91-100. http://dx.doi.org/10.1016/j.seppur.2007.05.040
Chisti Y, Moo-Young M. Airlift reactors: Characteristics, applications and design considerations. Chem Eng Commun 1987; 60: 195-242. http://dx.doi.org/10.1080/00986448708912017
Korpijarvi J, Oinas P, Reunanen J. Hydrodynamics and mass transfer in an airlift reactor. Chem Eng Sci 1999; 54: 2255-62. http://dx.doi.org/10.1016/S0009-2509(98)00439-4
Bandaiphet C, Prasertsan P. Effect of aeration and agitation rates and scale-up on oxygen transfer coefficient, kLa in exopolysaccharide production from Enterobacter cloacae WD7. Carbohyd Polym 2006; 66: 216–28. http://dx.doi.org/10.1016/j.carbpol.2006.03.004
Cornel P, Wagner M, Krause S. Investigation of oxygen transfer rates in full scale membrane bioreactors. Water Sci Technol 2003; 47: 313-19.
Kilonzo PM and Margaritis A. The effects of non-Newtonian fermentation broth viscosity and small bubble segregation on oxygen mass transfer in gas-lift bioreactors: a critical review. Biochem Eng J 2004; 17: 27–40. http://dx.doi.org/10.1016/S1369-703X(03)00121-9
Sato T, Ishii Y. Effects of activated-sludge properties on water flux of ultrafiltration membrane used for human excrement treatment. Water Sci Technol 1991; 23: 1601–8.
Badino JAC, Facciotti MCR, Schmidell W. Volumetric oxygen transfer coefficients (kLa) in batch cultivations involving non-Newtonian broths. Biochemical Engineering 2001; 8: 111-9. http://dx.doi.org/10.1016/S1369-703X(01)00092-4
Garcia-Ochoa F, Gomez E. Prediction of gas–liquid mass transfer in sparged stirred tank bioreactors. Biotechnol Bioeng 2005; 92: 761–72. http://dx.doi.org/10.1002/bit.20638
Painmanakul P, Loubière K, Hébrard G, Mietton-Peuchot M, Roustan M. Effect of surfactants on liquid-side mass transfer coefficients. Chem Eng Sci 2005; 60: 6480-91. http://dx.doi.org/10.1016/j.ces.2005.04.053
Hamoda M, Al-Sharekh H. Sugar wastewater treatment with aerated fixed-film biological systems. Water Sci Technol 1999; 40: 313-21.http://dx.doi.org/10.1016/S0273-1223(99)00400-X
Azami H, Mehrnia MR, Sarrafzadeh MH, Mafirad S, Kazemzadeh M, Madaeni SS. Effect of cations on activated sludge characterization and membrane fouling in membrane bioreactor for waste water treatment. Journal of Chemical and Petroleum Engineering 2010; 44: 1-8.
Le-Clech P, Jefferson B, Judd S. Impact of aeration, solids concentration and membrane characteristics on the hydraulic performance of a membrane bioreactor. J Membr Sci 2003; 218: 117-29. http://dx.doi.org/10.1016/S0376-7388(03)00164-9
Zhang J, Chua HC, Zhou J, Fane AG. Factors affecting the membrane performance in submerged membrane bioreactors. J Membr Sci 2006; 284: 54-66. http://dx.doi.org/10.1016/j.memsci.2006.06.022
Wang F, Shan L, Ji M. Components of released liquid from ultrasonic waste activated sludge disintegration. Ultrason Sonochem 2006; 13: 334–338.http://dx.doi.org/10.1016/j.ultsonch.2005.04.008
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