Abstract
The development of biogas technology is currently very fast along with the increasing need for energy and expensive costs used to buy fossil energy. Rice husk-based biogas has begun to be widely developed because of the high potential that can be utilized from the biomass. The aim of this study was to study the effect of the addition cow manure combined with rice husks for biogas production under SSAD conditions. Variable comparison of rice husk and cow manure as follows: 4:1, 3:1, 2:1, 1:1, 1:2, 1:3, and 1:4. The study was carried out in duplicate on laboratory scale with C/N ratio 35, 27% total solids and rumen fluid as a source of methanogenic bacteria. Biogas is observed every two days until its productivity decreases. It was found that the best biogas productivity was in the 2:1 variable range, namely 39.49 mL/grTS followed by 1:1 21.91 mL/grTS, 3:1 13.80 mL/grTS, 1:2 13.31 mL/grTS, 1:3 10.90 mL/grTS, 1:4 82 mL/grTS and 4:1 9.41 mL/grTS. After calculating the biogas production rate constant with Gompertz, the highest productivity was obtained at 1:1 variable, with maximum biogas (A): 65.69 mL/grTS, daily biogas production (U): 0.37 mL/grTS.day, and minimal time for biogas formation (\U0001d706): 25th day.
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