Pilot-scale two-stage process: a combination of acidogenic hydrogenesis and methanogenesis.
This study was performed to optimize both acidogenic hydrogenesis and methanogenesis, and then to develop a pilot-scale two-stage process producing not only CH4 but also H2. Firstly, acidogenic hydrogenesis of food waste was examined in pilot-scale leaching-bed reactors using dilution rate (D) as a tool to improve the environmental conditions. The maximum efficiency of 71.4% was obtained by adjusting D from 4.5 to 2.5 d(-1) depending on the state of degradation. Secondly, the wastewater from acidogenic hydrogenesis was converted to CH4 in a pilot-scale UASB reactor. The COD removal efficiency exceeded 95% up to the loading rates of 13.1 g COD/Ld, which corresponded to HRT of 0.25 d (6 h). Lastly, a pilot-scale two-stage process was devised based on a combination of acidogenic hydrogenesis and methanogenesis. Over 120 days, the pilot-scale process resulted in large VS reduction of 70.9% at the high loading rate of 12.5 kg VS/m3/d in a short SRT of 8 days.
Han
S K
SK
Department of Environmental Health, Korea National Open University, 169 Dongsung-dong, Jongno-gu, Seoul 110-791, Korea. skhan003@hotmail.com
Kim
S H
SH
Kim
H W
HW
Shin
H S
HS
D001421:Bacteria, Anaerobic / Q000378:metabolism*; D001674:Bioelectric Energy Sources; D019149:Bioreactors / Q000382:microbiology; D003246:Conservation of Energy Resources; D019605:Euryarchaeota / Q000378:metabolism* / Q000648:ultrastructure; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005735:Garbage; D006859:Hydrogen / Q000378:metabolism*; D008697:Methane / Q000378:metabolism*; D010865:Pilot Projects; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage
D005232:Fatty Acids, Volatile; D012722:Sewage; D006859:Hydrogen; D008697:Methane