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Delignification of disposable wooden chopsticks waste for fermentative hydrogen production by an enriched culture from a hot spring.

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Title: Delignification of disposable wooden chopsticks waste for fermentative hydrogen production by an enriched culture from a hot spring.
Authors: Phummala, Kanthima1 kobkku@gmail.com, Imai, Tsuyoshi1 imai@yamaguchi-u.ac.jp, Reungsang, Alissara2, Chairattanamanokorn, Prapaipid3, Sekine, Masahiko4, Higuchi, Takaya1, Yamamoto, Koichi4, Kanno, Ariyo4
Source: Journal of Environmental Sciences (Elsevier). Jun2014, Vol. 26 Issue 6, p1361-1368. 8p.
Subjects: Disposable tableware, Delignification, Hydrogen production, Hot springs, Fermentation, Temperature effect
Abstract: Hydrogen (H 2 ) production from lignocellulosic materials may be enhanced by removing lignin and increasing the porosity of the material prior to enzymatic hydrolysis. Alkaline pretreatment conditions, used to delignify disposable wooden chopsticks (DWC) waste, were investigated. The effects of NaOH concentration, temperature and retention time were examined and it was found that retention time had no effect on lignin removal or carbohydrate released in enzymatic hydrolysate. The highest percentage of lignin removal (41%) was obtained with 2% NaOH at 100°C, correlated with the highest carbohydrate released (67 mg/g pretreated DWC ) in the hydrolysate. An enriched culture from a hot spring was used as inoculum for fermentative H 2 production, and its optimum initial pH and temperature were determined to be 7.0 and 50°C, respectively. Furthermore, enzymatic hydrolysate from pretreated DWC was successfully demonstrated as a substrate for fermentative H 2 production by the enriched culture. The maximum H 2 yield and production rate were achieved at 195 mL H 2 /g total sugars consumed and 116 mL H 2 /(L·day), respectively. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Hydrogen (H 2 ) production from lignocellulosic materials may be enhanced by removing lignin and increasing the porosity of the material prior to enzymatic hydrolysis. Alkaline pretreatment conditions, used to delignify disposable wooden chopsticks (DWC) waste, were investigated. The effects of NaOH concentration, temperature and retention time were examined and it was found that retention time had no effect on lignin removal or carbohydrate released in enzymatic hydrolysate. The highest percentage of lignin removal (41%) was obtained with 2% NaOH at 100°C, correlated with the highest carbohydrate released (67 mg/g pretreated DWC ) in the hydrolysate. An enriched culture from a hot spring was used as inoculum for fermentative H 2 production, and its optimum initial pH and temperature were determined to be 7.0 and 50°C, respectively. Furthermore, enzymatic hydrolysate from pretreated DWC was successfully demonstrated as a substrate for fermentative H 2 production by the enriched culture. The maximum H 2 yield and production rate were achieved at 195 mL H 2 /g total sugars consumed and 116 mL H 2 /(L·day), respectively. [ABSTRACT FROM AUTHOR]
ISSN:10010742
DOI:10.1016/S1001-0742(13)60612-9