Abstract
Rice husk is one of agricultural waste generated from the mill is potential to be converted to biogas. Otherwise, biogas production facing problem due to the high lignin content. This research is objected to study the effect of enzymatic pretreatment and C/N ratio to biogas production from rice husk by solid state anaerobic digestion (SS-AD). The laboratory scale-anaerobic digestions was used in this work. It is operated in batch system and with room temperature. Total solid (TS) was set 21%. Enzymatic pretreatment was conducted using lignase enzyme. Carbon to Nitrogen (C/N) ratio was varied from 20, 25, 30, and 35. The C/N ratio is varied by adding some quantity of technical urea to the substrate. Biogas formed was measured using water displacement method in every two days. The result showed that enzymatic pretreatment could increase biogas production from 30 to 55 %. The highest biogas production was obtained at C/N ratio 35. Specific biogas production on C/N ratio of 20, 25, 30, and 35 were respectively 12.0, 12.6, 13.5 and 18.2 ml/gr TS. The volumetric loading resulted by SS-AD was higher than liquid anaerobic digestion (L-AD). The further research need to conduct for optimization the enzyme concentration and C/N ratio.
Highlights
Agricultural activities are very important from an economic view point and produces waste as a sustainable energy such as biogas [11] Availability of abundant lignocellulosic raw materials in the world makes lignocellulose become high demand raw materials for biofuel production [24]
Pretreatment of physics can be performed by size reduction to reduce the particle size and the degree of crystallinity of cellulose
Effect of Pretreatment on biogas production was observed in this study with the addition of enzyme as much as 5% volume of the solution for all the variables, the addition of NaOH as much as 3% of the volume of the solution
Summary
Agricultural activities are very important from an economic view point and produces waste as a sustainable energy such as biogas [11] Availability of abundant lignocellulosic raw materials in the world makes lignocellulose become high demand raw materials for biofuel production [24]. Lignocellulosic material contained by crop residue is difficult to be degraded by anaerobic bacteria. Lignocellulosic often contain lignin with high concentrations. Pretreatment on lignocellulosic raw materials aims to facilitate the conversion of biopolymer contained in the cellulose. Pretreatment performed may increase total yield of methane [14]. Pretreatment can be performed pretreatment of physics, chemistry and biology [23]. Pretreatment of physics can be performed by size reduction to reduce the particle size and the degree of crystallinity of cellulose. The process of size reduction can increase total hydrolysis yield as much as 5-25% and reduces digestion time of approximately 2359% [17]
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