2 production using a switchgrass steam exploded liquor Fermentative hydrogen (H 2) production from a steam exploded switchgrass liquor using inhibited mixed anaerobic microbial communities was studied in upflow anaerobic oakley dispatch sludge blanket reactors (UASBRs).
Increasing the H 2 yield was accomplished by treating the inoculum with linoleic acid (LA), varying the hydraulic retention time (HRT) and sparging liquid phase with nitrogen (N 2). A maximum H 2 yield of 2.56 +/ 0.10 mol mol( 1) hexose, was obtained at a 6 h HRT in LA treated cultures sparged with N 2. Sparging or LA treatment alone was able to enhance the H 2 yield by 46 +/ 5% and 38 oakley canada sunglasses +/ 3%, respectively, in comparison to control cultures operating at red oakley sunglasses a 6 h HRT. Of the different methods employed, N 2 sparging in combination with LA treatment proved to be more effective in enriching the H 2 producing bacteria belonging to Clostridium sp.
Species belonging to Propionibacterium, Bacteroides and Eubacterium, which were associated with H 2 consumption and reduced byproducts formation, were observed in addition to Clostridium white oakleys with blue lenses sp. in unsparged control cultures. Published by Elsevier Ltd.
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