Fermentation of Pretreated High-Biomass Sorghum Hydrolysates to Biohydrogen by Mixed Consortia

Nagaiah, D and Chiranjeevi, T and Rao, P S and Uma, A and Prakasham, R S (2016) Fermentation of Pretreated High-Biomass Sorghum Hydrolysates to Biohydrogen by Mixed Consortia. Sugar Tech, 18 (03). pp. 266-272. ISSN 0972-1525

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Abstract

In the present study, hydrolysate generated during pretreatment of high-biomass sorghum as a carbon source for biohydrogen production was investigated. The high-biomass sorghum bagasse (HBS) was pretreated using acid (H2SO4) and alkali (NaOH) at various concentrations (0.5–5 % w/v) for the residence time of 30 min at 121 °C, 15 lbs pressure at 10 % (w/v) solid loading. At the optimal acid load of 2 % (w/v) H2SO4 yielded 78.0 g COD/L of hydrolysate. The hydrolysate generated during this pretreatment was analyzed and noticed to contain glucose 10 g L−1, xylose 23 g L−1, arabinose 2.0 g L−1, HMF 1.9 g L−1, furfural 3.5 g−1, acetic acid 9.3 g L−1, formic acid 5.0 g L−1, and phenols 1.9 g L−1. The fermentation studies were conducted in dark conditions using all the hydrolysates by heat-treated mixed microbial consortia. Maximum H2 production rate (HPR), cumulative H2 production (CHP), and specific H2 yield (SHY) were measured. Maximum CHP (328 mL) and SHY (4.68 mol/kg CODr) were registered with acid treatment-resulted hydrolysate, and volatile fatty acid analysis indicated higher acetic acid concentration (1.6 g L−1) showing acidogenic microenvironment directing fermentation toward acetate pathway. The present study assumes importance in safe disposal and simultaneous production of value-added byproducts during lignocellulosic biorefinery. Fermentation of Pretreated High-Biomass Sorghum Hydrolysates to Biohydrogen by Mixed Consortia.

Item Type: Article
Divisions: RP-Dryland Cereals
CRP: CGIAR Research Program on Dryland Cereals
Uncontrolled Keywords: Sorghum; Pretreatment; Hydrolysates; Mixed microbial consortia; Fermentation; Biohydrogen
Subjects: Mandate crops > Sorghum
Depositing User: Mr Ramesh K
Date Deposited: 10 Aug 2015 09:44
Last Modified: 08 Jan 2017 06:34
URI: http://oar.icrisat.org/id/eprint/8922
Official URL: http://dx.doi.org/10.1007/s12355-015-0393-y
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: UNSPECIFIED
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