Hydrothermal pretreatment of rice straw biomass: A potential and promising method for enhanced methane production

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• 作者：R. Chandra^a ; ^b ; H. Takeuchi^b ; T. Hasegawa^b ; ^{t-hasegawa@esi.nagoya-u.ac.jp} ;
• 关键词：Rice straw ; Lignocellulosic agricultural biomass ; NaOH and hydrothermal pretreatments ; Methane fermentation ; Renewable fuel
• 刊名：Applied Energy
• 出版年：2012
• 期刊代码：2_03062619
• 类别：pw
• 出版时间：June, 2012
• 卷：94
• 期：Complete
• 页码：129-140
• 文件大小：1720 K

摘要

This paper presents the results of an experimental batch methane fermentation (at 37 掳C mesophilic temperature) study carried out on untreated and pretreated substrates of rice straw using NaOH and hydrothermal pretreatments. 3%NaOH pretreatment was given to ground rice straw biomass for 120 h at 37 掳C and hydrothermal pretreatment was given for 10 min at 200 掳C. It was observed that NaOH addition is a mandatory requirement for maintaining a suitable range of pH and starting the biogas production from hydrothermal pretreated biomass slurry of rice straw. The fed substrate concentrations were maintained at 5%TS (50 g TS/L). The study revealed into 140.0 L/kg VS_a biogas and 59.8 L/kg VS_a methane from untreated rice straw substrate. However, NaOH pretreated substrate resulted into 184.8 L/kg VS_a biogas and 74.1 L/kg VS_a methane. Hydrothermal pretreated followed by 5%NaOH added substrate resulted into highest biogas and methane production yields as 315.9 L/kg VS_a and 132.7 L/kg VS_a, respectively. NaOH pretreated substrate showed an increase of 132.0%in biogas production and 123.9%in methane production relative to the untreated substrate. However, the hydrothermal pretreated substrate had resulted into an increase of 225.6%in biogas production and 222.0%in methane production relative to untreated rice straw substrate. Hydrothermal pretreatment provided an accelerated pre-hydrolysis of biomass contents during the treatment process and thereby resulted into enhanced biogas and methane production yields.