Abstract
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%.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 23-30 |
| Number of pages | 8 |
| Journal | Applied Energy |
| Volume | 120 |
| DOIs | |
| State | Published - May 1 2014 |
| Externally published | Yes |
Bibliographical note
Funding Information:This study was supported by the National Natural Science Foundation of China ( 51176163 ), National High Technology R&D Program of China ( 2012AA050101 ), International Sci. & Tech. Cooperation Program of China (2012DFG61770 and 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).
Keywords
- Cassava starch
- Energy production efficiency
- Hydrogen fermentation
- Methanogenesis
- Microalgae
