Biosolids recycling impact on biofilm extracellular enzyme activity and performance of hybrid rotating biological reactors

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dc.contributor.authorHassard, Francis
dc.contributor.authorBiddle, Jeremy
dc.contributor.authorCartmell, Elise
dc.contributor.authorCoulon, Frederic
dc.contributor.authorStephenson, Tom
dc.date.accessioned2019-12-20T13:35:50Z
dc.date.available2019-12-20T13:35:50Z
dc.date.issued2019-11-30
dc.description.abstractBiological processes for wastewater treatment is limited by extracellular enzyme activity (EEA) of the biofilm on polymeric substrates. The efficiency of biodegradation / biosorption mechanisms causing EEA and organic load removal in biofilms remains unknown. Our hypothesis was that the limiting step of biological process can be overcome by biostimulation and/or bioaugmentation of the return sludge in hybrid biofilm reactors, which leads to competition between suspended and attached bacteria and lower effective substrate to microrganism ratio. Therefore, we considered more active biosolids to perform best at enhancing reactor removal rate. To test this, the efficacy of recycling distinct bio-solids types considered to have different bacterial activity such as final effluent (FE), humus solids (HS) and recycle activated sludge (RAS) on performance improvements of rotating biofilm reactors (RBRs). These bio-solids were investigated under high organic loading rates (OLR) and solids loading rates (SLR) using pilot scale reactors receiving real municipal wastewaters. Controlled overloading of RBRs revealed that EEA improved with increasing OLR/SLR. High SLR (>3.3 kg Total Suspended Solids m−2 d−1) delayed and decreased the reduction of organic and inorganic removal rates in the biological processes which commonly occurs under high OLRs. This effect was more pronounced in the highest activity solids (RAS > HS > FE) suggesting the activity and function of bio-solids was critical to improve performance of RBRs. High OLR and SLR induced efficient denitrification and organics removal within the biofilm reactor at residence times of <5 min. Recycling active solids permitted EEA despite overloading which was critical to the performance of the RBRs.en_UK
dc.identifier.citationHassard F, Biddle J, Cartmell E, et al., Biosolids recycling impact on biofilm extracellular enzyme activity and performance of hybrid rotating biological reactors. Science of the Total Environment, Volume 706, March 2020, Article number 135865en_UK
dc.identifier.cris25475630
dc.identifier.issn0048-9697
dc.identifier.urihttps://doi.org/10.1016/j.scitotenv.2019.135865
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14875
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectBiofilmen_UK
dc.subjectBiosolidsen_UK
dc.subjectDenitrificationen_UK
dc.subjectMicrobial extracellular enzyme activityen_UK
dc.subjectRotating biofilm contactoren_UK
dc.subjectHybrid biological processen_UK
dc.titleBiosolids recycling impact on biofilm extracellular enzyme activity and performance of hybrid rotating biological reactorsen_UK
dc.typeArticleen_UK

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