Abstract
Biogas technology is an alternative solution to the energy crisis issue in Indonesia. This study focuses on determining the optimum value of grind size variations in biogas production using the Liquid Anaerobic Digestion (L-AD) from rice husk waste. It is consists of the preparation stage, total solids calculation, the operation phase, and results analysis. The rice husk is collected from Rowosari village, and it has been pre-treated by 6% NaOH of chemical pre-treatment. The physical treatment uses numerous grind sizes, including un-grinded rice husk as control, and the 10 mesh, 18 mesh, 35 mesh, 60 mesh of rice husk as an observed variable. All variables are duplicate into 12 reactors, and the biogas production is observed by collecting gas volume in each reactor for 60 days. The calculated biogas is expressed by ml/grTS. The result shows that the grind size of 10 mesh, 18 mesh, 35 mesh, and 60 mesh rice husk produces a total biogas rate of 54.95, 44.86, 58.13, and 72.14 ml/grTS respectively. The rice husk control produces 9.67 ml/gr TS as the lowest rate of biogas production compared to the others, while the 60 mesh rice husk becomes the highest biogas production rate.
Highlights
Current world energy consumption still depends on fossil energy sources, which predicts to run out very soon
This condition is used to determine the composition of the material in the reactor in order to obtain the condition of Liquid Anaerobic Digestion
Pretreatment of rice husk by grinding produces higher biogas yield compared to rice husk without grinding process. 60 mesh grinding size resulting in optimum biogas yield of 102,000 ml / grTS for 60 days with a constant biogas production rate of 1.24154 ml / grTSday
Summary
Current world energy consumption still depends on fossil energy sources, which predicts to run out very soon. This issue occurs in Indonesia, which is very dependent on fossil fuels. The potential for biogas development in Indonesia is very significant, especially in rural areas where most people work in the field of animal husbandry and agriculture. The rice husk contains 9% of water content, and it consists of hollow tissue, fermentable material, and has high energy. It becomes very potential in producing gas [2]
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