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Effect of temperature fluctuation, substrate concentration, and composition of starchy substrates in mixture and use of plant oils as antifoams on biogas production
Author(s) -
Tumutegyereize Peter,
Ketlogetswe Clever,
Gandure Jerekias,
Banadda Noble
Publication year - 2018
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13115
Subject(s) - mesophile , substrate (aquarium) , anaerobic digestion , psychrophile , biogas , composition (language) , chemical composition , chemistry , methane , yield (engineering) , food science , anaerobic exercise , materials science , biology , organic chemistry , bacteria , composite material , ecology , physiology , linguistics , genetics , philosophy , enzyme
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 CH 4 /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. © 2018 American Institute of Chemical Engineers Environ Prog, 2018 © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13115, 2019