Abstract
The present study highlighted the effect of feedstock/water (F/W) ratio and temperature on biogas generation from cattle dung (CD) and vegetable waste (VW). The daily biogas generation was investigated for retention time of 55 days by considering F/W ratio of 80:20, 60:40, 40:60 and 20:80 for both the feedstocks. The highest cumulative biogas production for CD and VW were found to be 11.25 and 4.09 l with average pH values of 6.5 and 3.5 respectively at F/W ratio of 60:40. Temperature-controlled experiments were performed under mesophilic (35 ± 2 °C) and thermophilic (55 ± 2 °C) conditions at F/W ratio of 60:40, for detailed analysis. The biogas yields under mesophilic and thermophilic conditions were found to be 21.72% and 22.75% respectively higher compared to uncontrolled CD digesters. Whereas in the case of VW digesters, biogas yields under mesophilic and thermophilic conditions were observed to be 15.20% and 23.25% respectively higher than that of uncontrolled digesters.
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