Enhanced biogas production from rice straw with various pretreatment : a review

Abstract

Abstrack -Rice straw is one of organic material that can be used for sustainable production of bioenergy and biofuels such as biogas . Out of all bioconversion technologies for biogas production, anaerobic digestion (AD) is a most cost-effective bioconversion technology that has been implemented worldwide for commercial production of electricity, heat, and compressed natural gas (CNG) from organic materials. However, the utilization of rice straw for biogas production via anaerobic digestion has not been widely adopted because the complicated structure of the plant cell wall makes it resistant to microbial attack. Pretreatment of recalcitrant rice straw is essential to achieve high biogas yield in the AD process. A number of different pretreatment techniques involving using physical pretreatment (hydrothermal and freeze), chemical pretreatment (sodium carbonate -sodium sulfite, hydrogen peroxide, NMMO, alkaline, and dilute acid) and biological pretreatment (fungal pretreatment) also combined pretretment (microwave irradiation and chemical) approaches have been investigated, but there is no report that systematically compares the performance of these pretreatment methods for application on rice straw for biogas production. This paper reviews the methods that

The Effect of Acid Pre-Treatment using Acetic Acid and Nitric Acid in The Production of Biogas from Rice Husk during Solid State Anaerobic Digestion (SS-AD)

“…Another study by Helle et al (14), states that the formation of by-products such as acetic acid during pretreatment which then inhibit the fermentation process. In the previous research explains that the process of delignification, the acid will cause the structure of lignin and hemicellulose which binds cellulose will be condensed and settles so that the cellulose will be free structure that is separate from the lignin and hemicellulose then will facilitate the access of enzymes or microorganisms to convert cellulose to be monomers sugar as a nutrient for fermentation biogas [15]. Liginin The decline is also accompanied by a decrease in hemicellulose and cellulose is the main nutrient that will use microorganisms to produce biogas that biogas obtained results will be slightly [13].…”

The effect of pretreatment using sodium hydroxide and acetic acid to biogas production from rice straw waste

“…Decreased levels of lignin in the amount of 7.15% to 16.88% lignin content. During the decreased levels of lignin, cellulose is separated from the structure of lignocellulose is converted methane microorganisms that will ease the process of rice straw decomposition by microorganisms for the production of biogas (Sari et al, 2014). This is due to the increase in the rate of hydrolysis due to greater volumes of hydrogen ions that will help the process of dissolving hemicellulose and lignin.…”

“…Another study conducted [17] explained that the process of acid delignification will cause the structure of lignin and hemicellulose which binds cellulose condensed and settled so that the cellulose will be free structure that is separate from the lignin and hemicellulose then will facilitate the access of enzymes or microorganisms to transform cellulose to become monomer -monomer sugars as nutrients for fermentation biogas. The decline lignin is also accompanied by a decrease in hemicellulose and cellulose which is the main nutrient that will use microorganisms to produce biogas, so the results obtained will be slightly [25].…”

“…The decline lignin is also accompanied by a decrease in hemicellulose and cellulose which is the main nutrient that will use microorganisms to produce biogas, so the results obtained will be slightly [25]. Treatment using a weak acid solution is less effective in degrading lignin but it is more effective to reduce the levels of hemicellulose [17]. Therefore, research using a weak acid solution such as acetic acid is less effective that the results obtained biogas will also decrease because there are some cellulose is also dissolved at the time of immersion using a weak acid solution.…”

Effect of chopped maize straw on the quantity and quality of biogas produced

“…Straw is a lignin-cellulose material that, prior to introduction into the biogas fermenter, must be specially crafted using various techniques for this purpose (Sari et al 2014). Among others, chemicals that help to loosen the lignin-cellulose structure of straw are used, resulting in biogas yield increased by 2-4% (Song et al 2012).…”