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

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Relation http://oar.icrisat.org/8922/
http://dx.doi.org/10.1007/s12355-015-0393-y
 
Title Fermentation of Pretreated High-Biomass Sorghum Hydrolysates to Biohydrogen by Mixed Consortia
 
Creator Nagaiah, D
Chiranjeevi, T
Rao, P S
Uma, A
Prakasham, R S
 
Subject Sorghum
 
Description 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.
 
Publisher Springer Verlag
 
Date 2016
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/8922/1/nagaiah2015.pdf
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