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dc.contributor.authorBakke, Rune
dc.contributor.authorMilferstedt, Kim
dc.contributor.authorKommedal, Roald
dc.contributor.authorMorgenroth, Eberhard
dc.date.accessioned2009-12-07T13:41:24Z
dc.date.accessioned2017-04-19T12:52:25Z
dc.date.available2009-12-07T13:41:24Z
dc.date.available2017-04-19T12:52:25Z
dc.date.issued2006-05
dc.identifier.citationWater Research 40 (2006) 9, 1795-1804
dc.identifier.issn0043-1354
dc.identifier.urihttp://hdl.handle.net/11250/2438525
dc.description.abstractDegradation kinetics of different size dextrans in a biofilm reactor were evaluated. Degradation rates of dextran standards, measured as time series of oxygen utilisation rates (OUR), decreased with increasing initial molecular weight. Removal of bulk phase TOC with time was highly correlated (R2 > 0.99) and could be modeled with a variable half order degradation rate expressions. A power correlation between initial molecular weight and the variable half order degradation rate coefficient was found for polymers in the range 6-500 kDa. Degradation of dextran in the colloid size range (MW > 1 MDa) did not follow the same kinetics. Reductions in the observed removal rate with polymer size can be explained by the effect of reduced diffusivities of the substrate, without assuming reaction rate effects. This suggests that removal of polymers and particles in biofilm systems is transport limited.
dc.language.isoeng
dc.publisherElsevier
dc.subjectDextran
dc.subjectBiofilm
dc.subjectDiffusion
dc.subjectHydrolysis
dc.subjectHalf-order kinetics
dc.titleEffects of initial molecular weight on removal rate of dextran in biofilms
dc.typeJournal article
dc.typePeer reviewed
dc.subject.nsi472
dc.identifier.doi10.1016/j.watres.2006.02.032


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