A two-stage bioprocess for hydrogen and methane production from rice straw bioethanol residues

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• 作者：Hai-Hsuan Cheng^a ; Liang-Ming Whang^a ; ^b ; ^c ; ^{whang@mail.ncku.edu.tw} ; Chao-Wei Wu^a ; Man-Chien Chung^a
• 关键词：Bioenergy ; Anaerobic wastewater treatment ; Acetogenesis ; B/A ratio
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：June, 2012
• 卷：113
• 期：Complete
• 页码：23-29
• 文件大小：348 K

摘要

This study evaluates a two-stage bioprocess for recovering hydrogen and methane while treating organic residues of fermentative bioethanol from rice straw. The obtained results indicate that controlling a proper volumetric loading rate, substrate-to-biomass ratio, or F/M ratio is important to maximizing biohydrogen production from rice straw bioethanol residues. Clostridium tyrobutyricum, the identified major hydrogen-producing bacteria enriched in the hydrogen bioreactor, is likely utilizing lactate and acetate for biohydrogen production. The occurrence of acetogenesis during biohydrogen fermentation may reduce the B/A ratio and lead to a lower hydrogen production. Organic residues remained in the effluent of hydrogen bioreactor can be effectively converted to methane with a rate of 2.8 mmol CH₄/gVSS/h at VLR of 4.6 kg COD/m³/d. Finally, approximately 75%of COD in rice straw bioethanol residues can be removed and among that 1.3%and 66.1%of COD can be recovered in the forms of hydrogen and methane, respectively.