Enhancing enzymatic hydrolysis and biogas production from rice straw by pretreatment with organic acids

化学 水解 草酸 纤维素 木质纤维素生物量 稻草 酶水解 纤维素酶 生物量(生态学) 木质素 沼气 食品科学 生物能源 半纤维素 生物燃料 制浆造纸工业 农学 生物化学 生物技术 有机化学 废物管理 生物 无机化学 工程类
作者
Plaimein Amnuaycheewa,Rotchanaphan Hengaroonprasan,Kittipong Rattanaporn,Suchata Kirdponpattara,Kraipat Cheenkachorn,Malinee Sriariyanun
出处
期刊:Industrial Crops and Products [Elsevier BV]
卷期号:87: 247-254 被引量:152
标识
DOI:10.1016/j.indcrop.2016.04.069
摘要

Lignocellulosic biomass is recalcitrant to enzymatic and microbial degradation due to its chemical compositions and physical structures that inhibit the hydrolysis reactions. To obtain a high sugar yield for biofuel production, pretreatment process is generally needed to improve efficiency of hydrolysis. Here, organic acids were used to pretreat rice straw. Using Response Surface Methodology (RSM), the effect of three pretreatment parameters, including acid concentration, treatment time, and reaction temperature, on pretreatment efficiency were evaluated and used to generate mathematic optimization model. The hydrolysis results indicated that oxalic acid pretreatment led to the highest enhancement of enzymatic saccharification up to 213.4 mg (starting from 500 mg of pretreated sample) when using 5.01% oxalic acid concentration at 135.91 °C for 30.86 min, which was 2.68 times higher than the untreated rice straw. The structural changes in the pretreated biomass were investigated using FT-IR analysis. The results suggested that lignin composition was significantly removed from the pretreated biomass, and the crystalline cellulose was also modified to amorphous form during pretreatment. Both untreated and pretreated rice straw were subjected to anaerobic digestion to evaluate the influence of organic acid pretreatment on biogas production. The highest biogas yield was 322.1 ml/g-rice straw when using citric acid pretreatment which was 7.40 times higher than untreated biomass. These results demonstrated that organic acids can be used for pretreatment of lignocellulosic materials to enhance hydrolysis and biogas production.
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