Keywords: vermicompost concentrations, anaerobic digestion, methane production, accelerators, COD removal, chemical oxygen demand, buffering capacity
Vermicompost as an accelerator of methane production
The influences of different vermicompost concentrations of 8.33, 4.35 and 0.9%, respectively (based on TS), on the CH4 production, Specific Methanogenic Activities (SMAs) of the anaerobic sludge, pH and COD removal were investigated. A maximum cumulative CH4 production of 874 ml/L fermentation liquor was obtained from the experiment with vermicompost concentration of 8.33% which increased by 40.3% when compared with the control, and a maximum SMA of 295.9 mg COD CH4/g VS•d was achieved which increased by 45% relative to the control. The results also showed that vermicompost could enhance the COD removal and improve the buffering capacity of anaerobic digestion system.