Bio-hydrolysis and bio-hydrogen production from food waste by thermophilic and hyperthermophilic anaerobic process.
High-temperature pretreatment plays a key role in the anaerobic digestion of food waste (FW). However, the suitable temperature is not yet determined. In this work, a long-term experiment was conducted to compare hydrolysis, acidogenesis, acetogenesis, and hydrogen production at 55°C and 70°C, using real FW in CSTR reactors. The results obtained indicated that acidification was the rate-limiting step at both temperatures with similar process kinetics characterizations. However, the thermophilic pretreatment was more advantageous than the hyperthermophilic with suspended solids solubilization of 47.7% and 29.5% and total VFA vs. soluble COD ratio of 15.2% and 4.9%, for thermophilic and hyperthermophilic treatment, respectively, with a hydrolytic reaction time (HRT) of 10days and an OLR of 14kgCOD/m(3)d. Moreover, stable hydrogen yield (70.7ml-H2/gVSin) and content in off gas (58.6%) was achieved at HRT 5days, pH 5.5, and temperature of 55°C, as opposed to 70°C.
Biomass Engineering Center, College of Engineering, China Agricultural University, Beijing 100083, China; College of Agricultural Technology and Fish Science, Al-Neelain University, Khartoum, Sudan.
Dalal E
DE
Algapani
Biomass Engineering Center, College of Engineering, China Agricultural University, Beijing 100083, China; State R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee (BGFeuls), Beijing 100083, China. Electronic address: qiaowei@cup.edu.cn.
Wei
W
Qiao
Biomass Engineering Center, College of Engineering, China Agricultural University, Beijing 100083, China.
Min
M
Su
Gruppo Ricicla - DiSAA - University of Milan, via Celoria 2, 20133 Milano, Italy.
Francesca
F
di Pumpo
Biomass Engineering Center, College of Engineering, China Agricultural University, Beijing 100083, China.
Simon M
SM
Wandera
Gruppo Ricicla - DiSAA - University of Milan, via Celoria 2, 20133 Milano, Italy.
Fabrizio
F
Adani
Biomass Engineering Center, College of Engineering, China Agricultural University, Beijing 100083, China; State R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee (BGFeuls), Beijing 100083, China.
Renjie
R
Dong
D000143:Acids / Q000737:chemistry; D000693:Anaerobiosis; D061249:Batch Cell Culture Techniques; D056804:Biofuels; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D005502:Food; D006859:Hydrogen / Q000378:metabolism*; D006868:Hydrolysis; D007700:Kinetics; D008962:Models, Theoretical; D013696:Temperature; D013997:Time Factors; D014866:Waste Products
D000143:Acids; D056804:Biofuels; D014866:Waste Products; D006859:Hydrogen
Bio-hydrogen; Bio-hydrolysis; Food waste; Hyperthermophilic; Thermophilic