Journal
WATER RESEARCH
Volume 202, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2021.117440
Keywords
Biochar; Dark fermentation; Extracellular electron transfer; Mechanism; Sugarcane bagasse
Funding
- National Natural Science Founda-tion of China [51878291, 51908140, 52070079]
- Guangz-hou Science and Technology Program [202002030137]
- Open Project Funding of the Key Laboratory of Fermentation Engi-neering (Ministry of Education) [202105FE01]
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The study explored the benefits of biochar in dark fermentative hydrogen production, which increased biohydrogen production by stimulating bacterial growth, improving enzymatic activities, manipulating NADH/NAD+ ratio, and enhancing electron transfer efficiency. Biochar enrichment of cellulolytic Lachnospiraceae and electroactive bacteria formation on its surface suggested a synergistic effect between functional bacteria and extracellular electron transfer for enhanced performance in biohydrogen production.
The influence of biochar (BC) on anerobic digestion (AD) of organic wastes have been widely studied. However, the effect of BC on rate-limiting step during AD of lignocellulosic waste, i.e. the hydrolysis and acidogenesis step, is rarely studied and the underlying mechanisms have not been investigated. In this study, the benefits of BC with respect to dark fermentative hydrogen production were explored in a fermentation system by a heat-shocked consortium from sewage sludge (SS) with pretreated sugarcane bagasse (PSCB) as carbon source. The results showed that biochar boosted biohydrogen production by 317.1% through stimulating bacterial growth, improving critical enzymatic activities, manipulating the ratio of NADH/NAD+ and enhancing electron transfer efficiency of fermentation system. Furthermore, cellulolytic Lachnospiraceae was efficiently enriched and electroactive bacteria were selectively colonized and the ecological niche was formed on the surface of biochar. Synergistic effect between functional bacteria and extracellular electron transfer (EET) in electroactive bacteria were assumed to be established and maintained by biochar amendment. This study shed light on the underlying mechanisms of improved performance of biohydrogen production from lignocellulosic waste during mesophilic dark fermentation by BC supplementation.
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