Sequential acid and alkaline pretreatment of rice straw for bioethanol fermentation

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Weerasai K., Suriyachai N., Poonsrisawat A., Arnthong J., Unrean P., Laosiripojana N., Champreda V.

ผู้เผยแพร่: North Carolina State University

ปีที่เผยแพร่ (ค.ศ.): 2014

วารสาร: BioResources (1930-2126)

Volume number: 9

Issue number: 4

หน้าแรก: 5988

หน้าสุดท้าย: 6001

จำนวนหน้า: 14

นอก: 1930-2126

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911405797&doi=10.15376%2fbiores.9.4.5988-6001&partnerID=40&md5=bc40e967ff733487fb4de1cbaa841876

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Pretreatment is a prerequisite step for increasing the enzymatic digestibility of agricultural residues for conversion to fuels and chemicals in biorefineries. In this study, a sequential acid and alkaline process was developed for pretreatment of rice straw for ethanol fermentation. Effects of key parameters in acid pretreatment were studied using a full factorial design model, which showed the higher influence of time compared to acid concentration and temperature on reducing sugar yields. The combined sequential process involved an initial hemicellulose solubilization by dilute acid using 1% (w/v) H2SO4 at 125 ฐC for 10 min, followed by alkaline delignification using 1.25% NaOH at 90 ฐC for 10 min. Under these conditions, a glucose recovery yield of 70.9% from saccharification of the cellulose enriched fraction was obtained with 2- to 4-fold savings in chemical usage as compared with single-step processes. Scanning electron microscopy revealed modification of biomass micro-structure and increases in reactive surface area. Simultaneous saccharification and fermentation of the solid residues by Saccharomyces cerevisiae, using 25 FPU/g Accelleraseฎ 1500, led to a final ethanol concentration of 21.0 g/L with the productivity of 0.27 g/L/h, equivalent to 84.6% theoretical yield. The results indicate the potential of the sequential process for increasing pretreatment efficiency and allowing stepwise separation of lignocellulose components for multi-product biorefineries.

คำสำคัญ

Alkaline pretreatment, Dilute acid pretreatment, Ethanol, Lignocellulose, Rice straw