Effect of inhibitors on hydrogen consumption and microbial population dynamics in mixed anaerobic cultures
International Journal of Hydrogen Energy
Anaerobic mixed cultures; chain fatty-acids; degradation; enhanced biohydrogen production; fermentation in-vitro; fish oils; Furfural; Hydrogen consumption; linoleic-acid; methane; pretreatment; rumen fermentation; ruminal methanogenesis; Saturated long chain fatty acid; Unsaturated fish oil; Unsaturated long chain fatty acid
The impact of different chemical microbial stressors (2-bromoethanesulfonate (BES), furfural, fish oil, lauric acid (LUA) and linoleic acid (LA)) on the inhibition of mesophilic hydrogen (H-2) consumption was examined in this study. Hydrogen consumption half-life values were used to compare the extent of inhibition by the different microbial stressing agents. A statistical analysis of the percent H-2 consumed using Tukey's analysis revealed the following trend: Control > fish oil = linoleic acid (LA (C18:2)) = furfural > BES > lauric acid (LUA (C12:0). The terminal restriction fragment length polymorphism (T-RLFP) results indicated that aceticlastic methanogens (Methanosaeta sp., Methanosarcina sp.) and hydrogenotrophic methanogens (Methanococcus sp.) were inhibited by the different chemical stressing agents. Cultures fed LUA and LA had a high abundance of Clostridium sp., Clostridium propionicum and Propionibacterium acnes. In comparison, BES and furfural fed cultures contained large fractions of Clostridium sp., Eubacteria sp. and Bacteroides sp. while in the fish oil fed cultures, the dominant organism detected was Eubacteria sp. This study indicated that H-2 consumption was affected by the chemical stressing agent concentration. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Shanmugam, Saravanan R.; Chaganti, Subba Rao; Lalman, Jerald A.; and Heath, Daniel D.. (2014). Effect of inhibitors on hydrogen consumption and microbial population dynamics in mixed anaerobic cultures. International Journal of Hydrogen Energy, 39 (1), 249-257.