The efficiency of the anaerobic digestion process was evaluated depending on the organic loading rate (OLR) and temperature. The results of batch test were used to operate the lab scale experiment. The solubilization percentage of soluble chemical oxygen demand (SCOD) in the thermophilic acid reacto...
The efficiency of the anaerobic digestion process was evaluated depending on the organic loading rate (OLR) and temperature. The results of batch test were used to operate the lab scale experiment. The solubilization percentage of soluble chemical oxygen demand (SCOD) in the thermophilic acid reactor was 13~16% higher than that of the mesophilic reactor. Also, the removal efficiency of chemical oxygen demand (COD) in the mesophilic acid reactor was higher compared to that of the thermophilic acid reactor at lower organic loading rates; however, at high organic loading rate, it was higher in the thermophilic acid reactor. In a sludge thickener at 35℃ and 55℃, the removal efficiencies of volatile suspended solids (VSS) were 63.7% and 67.2%, respectively at Run 1 (with an OLR of 6 kg‧TCOD/m3‧day). At Run 2 with an OLR of 8 kg‧TCOD/m3‧day, the VSS removal efficiencies were 56.5% and 59.7% at 35℃ and 55℃, respectively. However, at Run 3 with an OLR of 10 kg‧TCOD/m3‧day, the initial VSS removal efficiency was reduced from about 56% to 31.8% at 35℃. Also, the COD and VSS removal efficiencies in the mesophilic reactor were greater than those of the thermophilic reactor. The COD removal efficiencies at 35℃ and 55℃ were 97% and 93% for Run 1, respectively, and were 94% and 91% for Run 2, respectively. Also, the VSS removal efficiencies at 35℃ and 55℃ were 93% and 90% for Run 1, respectively, and were 91% and 88% for Run 2, respectively. Furthermore, the amount of methane gas generated from the mesophilic and thermophilic reactors with an OLR of 6 kg‧TCOD/m3‧day were 0.66L CH4/L/day and 0.55L CH4/L/day, respectively, indicating that the specific methane production (SMP) of the mesophilic reactor was 0.03L‧CH4/g‧COD greater than that of the thermophilic reactor. Additionally, various inhibition phenomena were detected in both mesophilic and thermophilic reactors with an OLR of 10 kg‧TCOD/m3‧day (Run 3), which may be attributed to the increased concentrations of ammonia nitrogen and acetic acid (decreasing pH).
The efficiency of the anaerobic digestion process was evaluated depending on the organic loading rate (OLR) and temperature. The results of batch test were used to operate the lab scale experiment. The solubilization percentage of soluble chemical oxygen demand (SCOD) in the thermophilic acid reactor was 13~16% higher than that of the mesophilic reactor. Also, the removal efficiency of chemical oxygen demand (COD) in the mesophilic acid reactor was higher compared to that of the thermophilic acid reactor at lower organic loading rates; however, at high organic loading rate, it was higher in the thermophilic acid reactor. In a sludge thickener at 35℃ and 55℃, the removal efficiencies of volatile suspended solids (VSS) were 63.7% and 67.2%, respectively at Run 1 (with an OLR of 6 kg‧TCOD/m3‧day). At Run 2 with an OLR of 8 kg‧TCOD/m3‧day, the VSS removal efficiencies were 56.5% and 59.7% at 35℃ and 55℃, respectively. However, at Run 3 with an OLR of 10 kg‧TCOD/m3‧day, the initial VSS removal efficiency was reduced from about 56% to 31.8% at 35℃. Also, the COD and VSS removal efficiencies in the mesophilic reactor were greater than those of the thermophilic reactor. The COD removal efficiencies at 35℃ and 55℃ were 97% and 93% for Run 1, respectively, and were 94% and 91% for Run 2, respectively. Also, the VSS removal efficiencies at 35℃ and 55℃ were 93% and 90% for Run 1, respectively, and were 91% and 88% for Run 2, respectively. Furthermore, the amount of methane gas generated from the mesophilic and thermophilic reactors with an OLR of 6 kg‧TCOD/m3‧day were 0.66L CH4/L/day and 0.55L CH4/L/day, respectively, indicating that the specific methane production (SMP) of the mesophilic reactor was 0.03L‧CH4/g‧COD greater than that of the thermophilic reactor. Additionally, various inhibition phenomena were detected in both mesophilic and thermophilic reactors with an OLR of 10 kg‧TCOD/m3‧day (Run 3), which may be attributed to the increased concentrations of ammonia nitrogen and acetic acid (decreasing pH).
주제어
#Anaerobic digestion
#organic loading rate
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