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Anaerobic digestion of molasses by means of a vibrating and non-vibrating submerged anaerobic membrane bioreactor

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Abstract
Anaerobic digestion is an environmental key technology in the future bio-based economy that can be applied on a wide diversity of organic substrates for the conversion to methane and CO2. Molasses is an interesting waste stream because of its high organic matter and energy content, yet high salt concentrations might inhibit methanogenesis. In this study, a molasses waste stream was subjected to biomethanation in a submerged anaerobic membrane bioreactor (AnMBR). The application of an AnMBR offers several advantages, as it allows operation at high sludge retention times (SRT), leads to less residual sludge production and provides a better effluent quality. An AnMBR with biogas recirculation and an AnMBR with a vibrating membrane were compared in terms of methane production and membrane fouling. Biogas recirculation seemed to be a good way to avoid membrane fouling and to maintain a stable membrane flux of 0.86 L m2 h-1, while a vibrating membrane was insufficient, i.e. irreversible fouling of the membrane led to process failure. Stable methanation (> 90% COD removal) was obtained only when diluted molasses were used, indicating an inhibiting effect of molasses. Q-PCR results revealed an increased Bacteria:Archaea ratio and an increased Methanosaeta:Methanosarcina ratio in both systems. The archaeal community was strongly dominated by Methanosaeta species. This study demonstrated that an AnMBR with biogas circulation was suitable for anaerobic digestion of molasses.
Keywords
Biogas, Methanogenesis, Anaerobic membrane bioreactor, Anaerobic digestion

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Chicago
De Vrieze, Jo, Tom Hennebel, Jens Van den Brande, Ro’il Bilad, Ivo Vankelecom, Willy Verstraete, and Nico Boon. 2013. “Anaerobic Digestion of Molasses by Means of a Vibrating and Non-vibrating Submerged Anaerobic Membrane Bioreactor.” In Applied Biological Sciences, 18th National Symposium, Abstracts.
APA
De Vrieze, Jo, Hennebel, T., Van den Brande, J., Bilad, R., Vankelecom, I., Verstraete, W., & Boon, N. (2013). Anaerobic digestion of molasses by means of a vibrating and non-vibrating submerged anaerobic membrane bioreactor. Applied Biological Sciences, 18th National symposium, Abstracts. Presented at the 18th National symposium on Applied Biological Sciences (NSABS 2013).
Vancouver
1.
De Vrieze J, Hennebel T, Van den Brande J, Bilad R, Vankelecom I, Verstraete W, et al. Anaerobic digestion of molasses by means of a vibrating and non-vibrating submerged anaerobic membrane bioreactor. Applied Biological Sciences, 18th National symposium, Abstracts. 2013.
MLA
De Vrieze, Jo, Tom Hennebel, Jens Van den Brande, et al. “Anaerobic Digestion of Molasses by Means of a Vibrating and Non-vibrating Submerged Anaerobic Membrane Bioreactor.” Applied Biological Sciences, 18th National Symposium, Abstracts. 2013. Print.
@inproceedings{3262515,
  abstract     = {Anaerobic digestion is an environmental key technology in the future bio-based economy that can be applied on a wide diversity of organic substrates for the conversion to methane and CO2. Molasses is an interesting waste stream because of its high organic matter  and energy content, yet high salt concentrations might inhibit methanogenesis. In this study, a molasses waste stream was subjected to biomethanation in a submerged anaerobic membrane bioreactor (AnMBR). The application of an AnMBR offers several advantages, as it allows operation at high sludge retention times (SRT), leads to less residual sludge production and provides a better effluent quality. An AnMBR with biogas recirculation and an AnMBR with a vibrating membrane were compared in terms of methane production and membrane fouling. Biogas recirculation seemed to be a good way to avoid membrane fouling and to maintain a stable membrane flux of 0.86 L m2 h-1, while a vibrating membrane was insufficient, i.e. irreversible fouling of the membrane led to process failure. Stable methanation ({\textrangle} 90\% COD removal) was obtained only when diluted molasses were used, indicating an inhibiting effect of molasses. Q-PCR results revealed an increased Bacteria:Archaea ratio and an increased Methanosaeta:Methanosarcina ratio in both systems. The archaeal community was strongly dominated by Methanosaeta species. This study demonstrated that an AnMBR with biogas circulation was suitable for anaerobic digestion of molasses.},
  author       = {De Vrieze, Jo and Hennebel, Tom and Van den Brande, Jens and Bilad, Ro'il and Vankelecom, Ivo and Verstraete, Willy and Boon, Nico},
  booktitle    = {Applied Biological Sciences, 18th National symposium, Abstracts},
  keyword      = {Biogas,Methanogenesis,Anaerobic membrane bioreactor,Anaerobic digestion},
  language     = {eng},
  location     = {Ghent, Belgium},
  title        = {Anaerobic digestion of molasses by means of a vibrating and non-vibrating submerged anaerobic membrane bioreactor},
  year         = {2013},
}