TY - JOUR
T1 - Hydrogen production from acidogenic food waste fermentation using untreated inoculum
T2 - Effect of substrate concentrations
AU - Pu, Yunhui
AU - Tang, Jialing
AU - Wang, Xiaochang C.
AU - Hu, Yisong
AU - Huang, Jin
AU - Zeng, Yonggang
AU - Ngo, Huu Hao
AU - Li, Yuyou
N1 - Funding Information:
This work was financially supported by grants from the National Program of Water Pollution Control in China (Grant no. 2013ZX07310-001 ), the Natural Science Foundation of China (Grant no. 51508450 , 51778522 ), the Start-up Fund of Chengdu University (Grant no. 2081917045 ) and the Solid-state Fermentation Resource Utilization Key Laboratory of Sichuan Province (no. 2018GTJ008 ).
Publisher Copyright:
© 2019 Hydrogen Energy Publications LLC
PY - 2019/10/18
Y1 - 2019/10/18
N2 - The effect of substrate concentrations (0, 7.5, 15, 22.5, 30, and 37.5 g-VS/L) on hydrogen production from heat-treated and fresh food waste (FW) using untreated inoculums was investigated in this work. The highest hydrogen yield (75.3 mL/g-VS) was obtained with heat-treated FW at 15 g-VS/L. Lower substrate content could not provide enough organic matter for hydrogen fermentation, while higher substrate concentrations shifted the metabolic pathways from hydrogen fermentation to lactic acid fermentation by enriching the lactic acid bacteria (LAB), which lowered the slurry pH and decreased enzyme activity, resulting in a lower chemical oxygen demand (COD), volatile solid (VS), carbohydrate removal rate, and hydrogen yield. Compared with fresh FW, heat-treated FW is preferred for biohydrogen process with acetate as the main organic product. Additionally, at the optimal concentration (15 g-VS/L) using fresh FW, lactic acid is first accumulated and then degraded to produce hydrogen with butyrate as the main metabolite.
AB - The effect of substrate concentrations (0, 7.5, 15, 22.5, 30, and 37.5 g-VS/L) on hydrogen production from heat-treated and fresh food waste (FW) using untreated inoculums was investigated in this work. The highest hydrogen yield (75.3 mL/g-VS) was obtained with heat-treated FW at 15 g-VS/L. Lower substrate content could not provide enough organic matter for hydrogen fermentation, while higher substrate concentrations shifted the metabolic pathways from hydrogen fermentation to lactic acid fermentation by enriching the lactic acid bacteria (LAB), which lowered the slurry pH and decreased enzyme activity, resulting in a lower chemical oxygen demand (COD), volatile solid (VS), carbohydrate removal rate, and hydrogen yield. Compared with fresh FW, heat-treated FW is preferred for biohydrogen process with acetate as the main organic product. Additionally, at the optimal concentration (15 g-VS/L) using fresh FW, lactic acid is first accumulated and then degraded to produce hydrogen with butyrate as the main metabolite.
KW - Biohydrogen
KW - Food waste
KW - Lactic acid
KW - Substrate concentration
KW - Untreated inoculum
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U2 - 10.1016/j.ijhydene.2019.08.230
DO - 10.1016/j.ijhydene.2019.08.230
M3 - Article
AN - SCOPUS:85072268764
SN - 0360-3199
VL - 44
SP - 27272
EP - 27284
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 50
ER -
