Effect of Temperature Fluctuation, Substrate Concentration, and Composition of Starchy Substrates in Mixture and Use of Plant Oils as Antifoams on Biogas Production
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
Environmental Progress & Sustainable Energy
Abstract
This work investigated the effect of temperature fluctuations,
substrate concentration and composition on foaming in
anaerobic co-digestion of matooke, cassava, and sweet potato
peels for biogas production as well as the use of plant oils as
antifoams. In general, obtained results show that temperature
fluctuations from mesophilic (≥25 C) to psychrophilic range
(<25 C) is the major factor behind foaming in anaerobic
digestion. Specifically, at concentrations of 6 and 9 g VS/L with
methane yield of 1228.69 and 735.55 Nml CH4/g VS, respectively,
for 2:0:1 ratio, there was no foaming until after 7.6 days
compared with the other ratios where foaming generally started
after 3.5 days. This indicated that, apart from high substrate
concentration, foaming is also a function of substrate composition.
Plant oils were found to suppress foaming only if temperatures
were above 25 C, indicating temperature fluctuations to
be the main factor in foaming even in the presence of antifoams.
Description
Keywords
Temperature fluctuation, Biogas production, Foaming, Antifoams, Substrate concentration
Citation
Tumutegyereize, P., Ketlogetswe, C., Gandure, J., & Banadda, N. (2019). Effect of temperature fluctuation, substrate concentration, and composition of starchy substrates in mixture and use of plant oils as antifoams on biogas production. Environmental Progress & Sustainable Energy, 38(4), 13115. DOI 10.1002/ep