Co-production of hydrogen and methane from potato waste using a two-stage anaerobic digestion process.
Hydrogen and methane co-production from potato waste was examined using a two-stage process of anaerobic digestion. The hydrogen stage was operated in continuous flow under a pH of 5.5 and a HRT of 6h. The methane stage was operated in both continuous and semi-continuous flows under HRTs of 30 h and 90 h, respectively, with pH controlled at 7. A maximum gas production rate of 270 ml/h and an average of 119 ml/h were obtained from the hydrogen stage during the operation over 110 days. The hydrogen concentration contained in the gas was 45% (v/v), on average. The maximum and average gas production rates observed from methane reactor during the 74 days of semi-continuous flow operation were 187 and 141 ml/h, respectively, with an average methane concentration of 76%. Overall, 70% of VS, 64% of total COD in the feedstock were removed. The hydrogen and methane yields from the potato waste were 30 l/kg TS (with a maximum of 68 l/kg) and 183 l/kg TS (with a maximum of 225 l/kg), respectively. The total energy yield obtained was 2.14 kW h/kg TS, with a maximum of 2.74 kW h/kg TS.
Zhu
Heguang
H
Aquatic Ecosystems Management Research Division, Water Science and Technology, Environment Canada, 867 Lakeshore Road, PO Box 5050, Burlington, Ontario, Canada L7R 4A6. heguang.zhu@ec.gc.ca
Stadnyk
Aaron
A
Béland
Michel
M
Seto
Peter
P
D000693:Anaerobiosis; D019149:Bioreactors; D006859:Hydrogen / Q000378:metabolism*; D008697:Methane / Q000378:metabolism*; D010100:Oxygen; D011198:Solanum tuberosum / Q000378:metabolism*; D014865:Waste Disposal, Fluid; D014866:Waste Products
D014866:Waste Products; D006859:Hydrogen; D008697:Methane; D010100:Oxygen