Journal
APPLIED ENERGY
Volume 120, Issue -, Pages 23-30Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2014.01.045
Keywords
Microalgae; Cassava starch; Hydrogen fermentation; Methanogenesis; Energy production efficiency
Categories
Funding
- National Natural Science Foundation of China [51176163]
- National High Technology R&D Program of China [2012AA050101]
- International Sci. & Tech. Cooperation Program of China [2012DFG61770, 2010DFA72730]
- National Key Technology R&D Program of China [2011BAD14B02]
- Program for New Century Excellent Talents in University [NCET-11-0446]
- Specialized Research Fund for the Doctoral Program of Higher Education [20110101110021]
- Science and Technology Project of Guangxi Province [1346011-1]
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To enhance energy production efficiency (EPE) from microalgae Chlorella pyrenoidosa (CP), cassava starch (CS) was mixed with CP to optimise the carbon/nitrogen (C/N) ratio and facilitate efficient dark hydrogen fermentation, followed by photo hydrogen fermentation and methanogenesis. Steam heating with dilute acid was a preferred pre-treatment method to hydrolyze mixed biomass. The maximum dark hydrogen yield of 276.2 mL/g total volatile solids (TVS) from the mixed biomass at C/N molar ratio of 25.3 showed 3.7-fold and 1.8-fold increases, respectively, compared with those from only CP and only CS. The maximum dark hydrogen production rate of 31.96 mL/g TVS/h from the mixed biomass at the C/N molar ratio of 15.6 showed 3.4-fold and 3.7-fold increases, respectively, compared with those from only CP and only CS. The dark and photo hydrogen yield of 664.2 mL/g TVS and the methane yield of 126.0 mL/g TVS corresponded to a total EPE of 67.2%. (C) 2014 Elsevier Ltd. All rights reserved.
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