Abstract
Rice straw has an enormous amount of biomass for energy use, but the complexity of the cell wall component hinders technical processes. Although belonging to rice straws, the straws from different varieties should be with different treatment strategies to obtain best energy efficiency. To confirm this hypothesis, 7 different rice varieties (RPY GENG, RIL269, RIL272, RIL31, RIL57, RIL06, LUOHUI 9) with different cell wall traits from RIL population were evaluated for their response toward different pretreatments. For japonica RPY GENG, 2% of H2SO4 acid was best pre-treatment while high acid (5% of H2SO4) pretreatment caused undue loss. For Indica LUOHUI 9 rice, high acid pretreatment was suitable, while RIL57 had maximum of glucose yield with high alkali (10% NaOH) pretreatment. High-concentration alkali pretreatment is the most convenient and effective pretreatment method for the treatment of unknown varieties of rice straws, because the lignin has been removed and has the lowest negative effects on the glucose yield under the high alkali condition. As the RILs used in this study vary considerably in their wall structure, an understanding of their response to different pre-treatments confirms our hypothesis and help us to understand the influence of different wall compositions on the final output.
Highlights
Rice straw makes a significant contribution to lignocellulosic biomass and has great utilization value for bioethanol production in China
The seven samples, with obvious differences in cell wall structure were selected in the present study and have different performances on different pre-treatments, which means that the same pretreatment may not be appropriate for all types of straw
RPY GENG straw has a lower lignin content, and low-concentration acid is more easy to damage the cell wall, which shows that RPY GENG straw has the highest glucose yield under 2% H2SO4 treatment (Li et al, 2010)
Summary
Many chemical and biological treatments are required for efficient conversion of rice straw to fermentable sugars which later can be converted to ethanol or other fuels (Takano and Hoshino, 2018). Optimal Pretreatment for Different Straw composition between high-cultivated varieties derived from same parents is either lacking or only superficial (Chen et al, 2020; Samavi and Rakshit, 2020). Rice varieties cultivated in different regions of the world might have different straw cell wall composition, so application of one pretreatment technology for straw conversion to bioethanol is undesirable (Gao et al, 2005). Due to large-scale planting of different varieties, there is a need to explore appropriate pretreatment strategy basing on cell wall structures of rice straw in order to improve efficiency for obtaining maximum industrial benefits and environmental protection
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