Su Xiaojun

Effect of temperature on anaerobic biogas fermentation by sweet potato lees.

Under the temperature of 30, 35, 40, 45 ℃, the anaerobic fermentation experiment was done in the self-made small methane fermentation installment by taking the sweet potato lees as raw material and inoculating 30%(V/V) activated sludge. The effect of temperature on anaerbic biogas fermentation by sweet potato lees was studied by measuring the gas production rate and COD values. It was indicated that the gas production rate was 70.94 mL/gTS(30 ℃), 24.42 mL/g TS(35 ℃), 49.70 mL/g TS(40 ℃)and 74.19 mL/g TS(45 ℃) and the COD reduction rate was 32.62%, 18.53%, 29.38%, 34.83% respectively. The gas production rate and COD reduction rate of the 30, 45 ℃ were obviously higher than the others. The pH values of 45 ℃ were on good condition, while the pH values of 35 ℃ had acidified phenomenon in the later period.