Enhancement of biogas production from rice husk using mechanical pretreatment (grinding) in Liquid Anaerobic Digestion (L-AD)

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.

Effect of Cow Manure on Biogas Production Based on Rice Husk Waste in SSAD Conditions

“…Biogas with rice husk as raw material has the characteristics of gas production which is produced slowly but with a long continuity. This is due to the difficulty of processing rice husks by anaerobic bacteria in the reactor due to the lignin content even though chemical pretreatment using NaOH has been carried out [7], [8], [21]. Next on this variable is cow dung with half the content of rice husks.…”

“…This first generation was very successful because it was so easy to convert livestock waste into biogas energy. As a result of the high agricultural waste, currently researchers are also developing biogas with agricultural waste as raw material and commonly referred to as second generation biogas technology [6]- [8]. The principle of biogas technology is to ferment organic material (waste) anaerobically without oxygen with the help of methanogenic bacteria.…”

“…Biogas production using anaerobic digestion (AD) has two benefits, namely being able to process the waste and produce biogas which can be used as an alternative energy source in the form of renewable energy. In addition, other advantages was obtained such as reduce greenhouse gas emissions and produce fertilizers in the form of organic fertilizers which can increase the community's economy [8][9]. The AD process based on TS content is classified into L-AD and SS-AD.…”