Enhancement of energy production efficiency from mixed biomass of Chlorella pyrenoidosa and cassava starch through combined hydrogen fermentation and methanogenesis

Ao Xia, Jun Cheng, Lingkan Ding, Richen Lin, Wenlu Song, Junhu Zhou and Kefa Cen

Applied Energy, 2014, vol. 120, issue C, 23-30

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 276.2mL/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 31.96mL/gTVS/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 664.2mL/gTVS and the methane yield of 126.0mL/gTVS corresponded to a total EPE of 67.2%.

Keywords: Microalgae; Cassava starch; Hydrogen fermentation; Methanogenesis; Energy production efficiency (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (16)

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DOI: 10.1016/j.apenergy.2014.01.045

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