Abstract
Pretreatment during biogas production aims to assist in degradation of lignin contained in the rice husk. In this study, pretreatment which is used are acid and biological pretreatment. Acid pretreatment was performed using acetic acid and nitric acid with a variety levels of 3% and 5%. While biological pretreatment as a control variable. Acid pretreatment was conducted by soaking the rice straw for 24 hours with acid variation. The study was conducted using Solid State Anaerobic Digestion (SS-AD) with 21% TS. Biogas production was measured using water displacement method every two days for 60 days at room temperature conditions. The results showed that acid pretreatment gave an effect on the production of biogas yield. The yield of the biogas produced by pretreatment of acetic acid of 5% and 3% was 43.28 and 45.86 ml/gr.TS. While the results without pretreatment biogas yield was 29.51 ml/gr.TS. The results yield biogas produced by pretreatment using nitric acid of 5% and 3% was 12.14 ml/gr.TS and 21.85 ml/gr.TS. Results biogas yield with acetic acid pretreatment was better than the biogas yield results with nitric acid pretreatment.
Highlights
According to Minister of Energy and Mineral Resources, the dependence on fossil fuels, oil in fulfilling domestic consumption is still high at 96% of the total consumption and to maximize the utilization of energy renewable not capable of running as planned
Rice straw is composed of three types of main components, cellulose, hemicellulose, and lignin
A key success factor for biogas production is to increase the efficiency of hydrolysis of biomass with increasing accessibility enzyme through pretreatment method [3]
Summary
According to Minister of Energy and Mineral Resources, the dependence on fossil fuels, oil in fulfilling domestic consumption is still high at 96% (petroleum 48%, gas 18% and coal 30%) of the total consumption and to maximize the utilization of energy renewable not capable of running as planned. Indonesian government's efforts in dealing with the energy issue is with the issuing of Law No 5/2006 on the use of new and renewable energy. One of the major agricultural sector is rice. Rice straw is composed of three types of main components, cellulose, hemicellulose, and lignin. One of the problems in the production of biogas from biomass lignin is resistance to biodegradation or hydrolysis [2]. A key success factor for biogas production is to increase the efficiency of hydrolysis of biomass with increasing accessibility enzyme through pretreatment method [3]
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