Journal
BIORESOURCE TECHNOLOGY
Volume 300, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122702
Keywords
Anaerobic digestion; Biohythane; Cell entrapment; kappa-Carrageenan; Dark fermentation; Single-stage fermentation
Funding
- Ministry of Science and Technology, Taiwan [MOST 104-2221-E-035-006-MY3, MOST 106-2221-E-035-086-MY2]
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This study demonstrates the continuous biohythane production in a single-stage anaerobic digester using a biomass mixture of separately entrapped hydrogenic and methanogenic bacteria (H-2- and CH4-producing bacteria, respectively). The entrapped hydrogenic/methanogenic bacteria biomass ratios of 1/4, 2/3, 3/2 and 4/1 were tested and shown to have a great effect on the single-stage biohythane production performance. At steadystates, the cultivations had biohythane production rates in the range of 381-480 mL/L-d, with H-2 content in biohythane (HCH) varying from 1% to 75% (v/v) and chemical oxygen demand removal efficiencies (TCOD re ) of 57.6-81.9%. Biomass ratio 2/3 (weight ratio 1/1.5) resulted in peak biohythane production with H-2 and CH4 production rates being 64.6 and 395 mL/L-d, respectively, HCH 15% and TCODre 74.4%. The novelty of this work is to show the potential of producing biohythane from an innovative single-stage dark fermentation system using entrapped hydrogenic and methanogenic bacteria.
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