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Dark fermentative H-2 production from xylose and lactose - Effects of on-line pH control

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dc.contributor.authorÇALLI, BARIŞ
dc.contributor.authorsCalli, Baris; Schoenmaekers, Kim; Vanbroekhoven, Karolien; Diels, Ludo
dc.date.accessioned2022-03-12T17:34:19Z
dc.date.available2022-03-12T17:34:19Z
dc.date.issued2008
dc.description.abstractAlthough xylose and lactose, two major carbohydrates existing in lignocellulosic and dairy wastes, are produced in huge amounts every year, their potentials in dark fermentative H-2 production were not investigated sufficiently and the optimum fermentation pH is still unclear particularly at thermophilic temperatures. Therefore, in this study, the influence of pH on fermentative H-2 production from xylose and lactose was investigated using a mixed culture compost inoculum. Completely mixed thermophilic (55 degrees C) bioreactors were operated in sequential batch mode at constant pH levels between 4.7 and 6.5. The highest H-2 yield in fermentation of xylose was achieved as 1.70 mol/mol at pH 5.0. The H-2 yield was strongly affected by the level of pH and butyrate fermentation. The unsatisfactory yields were associated with lactate fermentation at pH 4.7 and without pH control and with ethanol formation at pH 6.0. The optimal pH for stable H-2 yield from lactose was suggested to be 5.3 considering the molar yields increased to a maximum of 3.45 mol H-2/mol hexose sugar. Another indication of efficient H-2 production at pH 5.3 was the metabolic shift from ethanol to butyrate fermentation. Acetate fermentation yielding H-2 below stoichiometric ratios especially in low H-2 yielding runs revealed that some portion of the H-2 was consumed by acetogenic bacteria. (C) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
dc.identifier.doi10.1016/j.ijhydene.2007.10.012
dc.identifier.eissn1879-3487
dc.identifier.issn0360-3199
dc.identifier.urihttps://hdl.handle.net/11424/229003
dc.identifier.wosWOS:000253791300005
dc.language.isoeng
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.relation.ispartofINTERNATIONAL JOURNAL OF HYDROGEN ENERGY
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectbutyrate fermentation
dc.subjectethanol
dc.subjectH-2 consumption
dc.subjectlactate
dc.subjectthermophilic
dc.subjectHYDROGEN-PRODUCTION
dc.subjectCLOSTRIDIUM-THERMOLACTICUM
dc.subjectMETHANE PRODUCTION
dc.subjectBIOHYDROGEN
dc.subjectWASTE
dc.subjectPRETREATMENT
dc.subjectCONVERSION
dc.subjectBACTERIA
dc.subjectCULTURE
dc.subjectGLUCOSE
dc.titleDark fermentative H-2 production from xylose and lactose - Effects of on-line pH control
dc.typearticle
dspace.entity.typePublication
local.avesis.id93e04e08-24a4-4509-a8a9-c41c524deb20
local.import.packageSS17
local.indexed.atWOS
local.indexed.atSCOPUS
local.journal.numberofpages9
oaire.citation.endPage530
oaire.citation.issue2
oaire.citation.startPage522
oaire.citation.titleINTERNATIONAL JOURNAL OF HYDROGEN ENERGY
oaire.citation.volume33
relation.isAuthorOfPublication2e20fe96-469a-44e0-88b2-e56450a93cf6
relation.isAuthorOfPublication.latestForDiscovery2e20fe96-469a-44e0-88b2-e56450a93cf6

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