초록
Preliminary investigations were performed in the laboratory using batch reactors at 10% solid concentration for the assessment of the biogas production at thermophilic and mesophilic temperatures using solid residues generated during ethanol fermentation process. One kg of solid residues (left after enzyme extraction and enzymatic hydrolysis) from thermophilic reactors (TR<SUB>1</SUB> and TR<SUB>2</SUB>) produced around 131 and 84L of biogas, respectively, whereas biogas production from mesophilic reactors (MR<SUB>1</SUB> and MR<SUB>2</SUB>) was 86 and 62L, respectively. After 20 and 35days of retention time, the TS and VS reductions from TR<SUB>1</SUB>, TR<SUB>2</SUB> and MR<SUB>1</SUB>, MR<SUB>2</SUB> were found to be 39.2% and 35.0%, 67.3% and 61.0%, 21.0% and 18.0%, 34.7% and 27.8%, respectively. Whereas the liquid waste was treated using four laboratory anaerobic hybrid reactors (AHRs) with two different natural and synthetic packing media at 15-3days HRTs. AHRs packed with natural media showed better COD removal efficiency and methane yield.