Induction of granulation by sulphonated-lignin and calcium in an upflow Anaerobic sludge bed reactor

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DOIResolve DOI: http://doi.org/10.1002/jctb.280530108
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TypeArticle
Journal titleJournal of Chemical Technology and Biotechnology
Volume53
Issue1
Pages4556; # of pages: 12
Subjectanaerobic digestion; UASB; NSSC pulping; spent liquor; sulphonated lignin; flocculant; granulation; carbon/nitrogen ratio; protein ratio; Zeta potential; hydrophilic; electron microscopy; specific activity
AbstractThe present study evaluates the capability of sulphonated lignin (S-lignin) and calcium to promote anaerobic sludge granulation, which is of prime importance in the operation of upflow anaerobic sludge bed (UASB) -like reactors. One of two reactors fed with a synthetic sugar waste was stepwise supplemented with a spent liquor rich in S-lignin from a neutral sulphite semi-chemical pulping plant to reach an addition rate of 0.17 g S-lignin per gram volatile suspended solid (VSS) per day. This resulted in biomass pre-granulation (50–60% of the biomass aggregates had a size > 0.3 mm). No change was observed in the surface properties (hydrophobicity and zeta potential) of the bacterial aggregates. The S-lignin-fed sludge aggregated in an ordered and cluster-like manner and exhibited a more compact ultrastructure than the control sludge. Moreover, the addition of S-lignin slightly enhanced the metabolic activities of the biomass. Calcium ion addition following the S-lignin treatment improved the size and the settleability of the aggregates and increased the solid retention time.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Biotechnology Research Institute
Peer reviewedYes
NPARC number21196400
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Record identifier9e6b0e5e-f9e4-44bf-b5a0-bd35c01de78b
Record created2013-01-16
Record modified2016-05-09
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