Maximum organic loading rate for the single-stage wet anaerobic digestion of food waste.
Anaerobic digestion of food waste was conducted at high OLR from 3.7 to 12.9 kg-VS m(-3) day(-1) for 225 days. Periods without organic loading were arranged between the each loading period. Stable operation at an OLR of 9.2 kg-VS (15.0 kg-COD) m(-3) day(-1) was achieved with a high VS reduction (91.8%) and high methane yield (455 mL g-VS-1). The cell density increased in the periods without organic loading, and reached to 10.9×10(10) cells mL(-1) on day 187, which was around 15 times higher than that of the seed sludge. There was a significant correlation between OLR and saturated TSS in the sludge (y=17.3e(0.1679×), r(2)=0.996, P<0.05). A theoretical maximum OLR of 10.5 kg-VS (17.0 kg-COD) m(-3) day(-1) was obtained for mesophilic single-stage wet anaerobic digestion that is able to maintain a stable operation with high methane yield and VS reduction.
Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577, Japan. nagao@ibs.upm.edu.my
Norio
N
Nagao
Nobuyuki
N
Tajima
Minako
M
Kawai
Chiaki
C
Niwa
Norio
N
Kurosawa
Tatsushi
T
Matsuyama
Fatimah Md
FM
Yusoff
Tatsuki
T
Toda
D000693:Anaerobiosis; D001419:Bacteria / Q000166:cytology / Q000254:growth & development / Q000378:metabolism; D056804:Biofuels / Q000032:analysis; D019149:Bioreactors / Q000382:microbiology; D001709:Biotechnology / Q000379:methods*; D015169:Colony Count, Microbial; D005232:Fatty Acids, Volatile / Q000032:analysis; D005502:Food; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000032:analysis; D009930:Organic Chemicals / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry / Q000382:microbiology; D013997:Time Factors; D014835:Volatilization; D014866:Waste Products / Q000032:analysis*; D014867:Water / Q000737:chemistry*
D056804:Biofuels; D005232:Fatty Acids, Volatile; D009930:Organic Chemicals; D012722:Sewage; D014866:Waste Products; D014867:Water; D008697:Methane