Investigating the significance of coagulation kinetics on maintaining membrane permeability in an MBR following reactive coagulant dosing

Simple item page
dc.contributor.authorAutin, Olivier
dc.contributor.authorHai, F.
dc.contributor.authorJudd, Simon J.
dc.contributor.authorMcAdam, Ewan J.
dc.date.accessioned2016-06-28T10:36:54Z
dc.date.available2016-06-28T10:36:54Z
dc.date.issued2016-06-11
dc.description.abstractIn this study, the impact of kinetically controlled floc growth on sustaining membrane permeability following reactive coagulant dosing was determined using a model particle system. Floc formation was indicated to comprise of two stages following coagulant addition: (i) an initial destabilisation phase which encouraged complexation of protein and polysaccharide; and (ii) entrapment of the coarse model particles (3 µm Firefli™ microspheres) in the polymeric complex during the floc growth phase. Floc growth was characterised by an expected time lag as with conventional flocculation systems and biopolymer aggregation was kinetically favoured. When coagulant was dosed during the filtration cycle, the intermediate biopolymer aggregates (comprised of protein and polysaccharide) were preferentially transported toward the membrane increasing fouling. However, when coagulant was dosed at the onset of filtration, membrane fouling was constrained. It is asserted that by dosing at the onset of filtration: (i) early development of biopolymer aggregation is initiated which inhibits transport of the individual biopolymers to the membrane; and (ii) by dosing coagulant in the absence of a developed polarised layer, formation of biopolymer complexes local to the membrane is obviated. However, when dosing coagulant at the onset of filtration, only limited floc growth occurred which can be explained by the low applied wall shear rate and the absence of a ‘polarised’ region which ostensibly promoted floc growth when coagulant was dosed mid-filtration. Based on results from the model particle system studied, it is proposed that reactive coagulant dosing is best undertaken when: (i) filtration is stopped; (ii) modest shear is applied within the bioreactor to promote coagulant dispersion; and (iii) sufficient contact time is allowed to promote floc growth before commencement of filtration.en_UK
dc.identifier.citationAutin O, Hai F, Judd S, McAdam EJ, (2016) Investigating the significance of coagulation kinetics on maintaining membrane permeability in an MBR following reactive coagulant dosing. Journal of Membrane Science, Volume 516, October 2016, pp. 64-73en_UK
dc.identifier.cris14631137
dc.identifier.issn0376-7388
dc.identifier.urihttp://dx.doi.org/10.1016/j.memsci.2016.06.008
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/10035
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectMembrane performanceenhanceren_UK
dc.subjectMembrane bioreactoren_UK
dc.subjectDirect visualobservationen_UK
dc.titleInvestigating the significance of coagulation kinetics on maintaining membrane permeability in an MBR following reactive coagulant dosingen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Investigating_the_significance_of_coagulation_kenitics-2016.pdf
Size:
1.1 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.79 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SWEE)