This study reports high rate hydrogen production from cello-lignin fraction of de-oiled jatropha waste (DJW) using hybrid immobilized cells in continuous operation. A continuous stirred tank reactor (1 L) was operated at the hydraulic retention time (HRT) range of 48-8 h to study the hydrogen production rate (HPR) and yield (HY). The cello-lignin fraction used as the substrate was the non-hydrolyzed residue of acid pretreated DJW. Experimental results showed a peak HPR of 3.65 L H2/L d and HY of 150 mL H2/g reducing sugars at the optimum HRT of 12 h and 37 °C. A significant drop in the hydrogen productivity was seen at 8 h HRT. Acetate and butyrate were the major soluble metabolic products at all HRTs, with predominance of butyrate at the optimum HRT. Major hydrogen producers belonged to Eubacterial group as evident from the molecular microbial community analysis. The energy production rate and CO2 emission reduction analyses suggested cello-lignin fraction of DJW as a high energy yielding residue which can produce 2.2 kW electricity/y and an annual CO2 emission reduction of 4.48 ton/y in a coal based power plant.
Bibliographical noteFunding Information:
The authors gratefully acknowledge the financial support by Taiwan’s Bureau of Energy (grant no. 101-D0204-3 ), Taiwan’s National Science Council ( NSC-99-2221-E-035-024-MY3 , NSC-99-2221-E-035-025-MY3 , NSC-99-2632-E-035-001-MY3 , and NSC-101-2218-E-035-003-MY3 ), and Feng Chia University ( FCU-10 G 27101 ). We also thank Hua Neng Environmental Protection and Energy Technology Ltd., Taiwan for providing us the deoiled Jatropha waste. Authors would like to acknowledge Prof. Chun-Hsiung Hung (National Chung Hsing University, Taiwan) for extending his laboratory support on FISH analysis.
© 2016 Elsevier Ltd. All rights reserved.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Organic Chemistry