High-calorific biogas production from anaerobic digestion of food waste using a two-phase pressurized biofilm (TPPB) system.
To obtain high calorific biogas via anaerobic digestion without additional upgrading equipment, a two-phase pressurized biofilm system was built up, including a conventional continuously stirred tank reactor and a pressurized biofilm anaerobic reactor (PBAR). Four different pressure levels (0.3, 0.6, 1.0 and 1.7MPa) were applied to the PBAR in sequence, with the organic loading rate maintained at 3.1g-COD/L/d. Biogas production, gas composition, process stability parameters were measured. Results showed that with the pressure increasing from 0.3MPa to 1.7MPa, the pH value decreased from 7.22±0.19 to 6.98±0.05, the COD removal decreased from 93.0±0.9% to 79.7±1.2% and the methane content increased from 80.5±1.5% to 90.8±0.8%. Biogas with higher calorific value of 36.2MJ/m3was obtained at a pressure of 1.7MPa. Pressure showed a significant effect on biogas production and gas quality in methanogenesis reactor.
Institute of New Energy, State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, China University of Petroleum Beijing (CUPB), Beijing 102249, PR China. Electronic address: liyeqingcup@126.com.
Yeqing
Y
Li
Institute of New Energy, State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, China University of Petroleum Beijing (CUPB), Beijing 102249, PR China.
Hong
H
Liu
Institute of New Energy, State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, China University of Petroleum Beijing (CUPB), Beijing 102249, PR China.
Fang
F
Yan
Institute of New Energy, State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, China University of Petroleum Beijing (CUPB), Beijing 102249, PR China.
Dongfang
D
Su
Institute of New Energy, State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, China University of Petroleum Beijing (CUPB), Beijing 102249, PR China.
Yafei
Y
Wang
Institute of New Energy, State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Biogas Upgrading Utilization, China University of Petroleum Beijing (CUPB), Beijing 102249, PR China.
Hongjun
H
Zhou
D000693:Anaerobiosis; D018441:Biofilms; D056804:Biofuels; D019149:Bioreactors; D003246:Conservation of Energy Resources; D004063:Digestion; D005502:Food; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000096:biosynthesis*; D011312:Pressure
D056804:Biofuels; D008697:Methane
Anaerobic digestion; High-calorific biogas; Pressure; Two-phase