Dominance of candidate Saccharibacteria in a membrane bioreactor treating medium age landfill leachate: Effects of organic load on microbial communities, hydrolytic potential and extracellular polymeric substances

•Organic load, salinity and NH4+-N influenced EPS and SMP during leachate treatment.•Exceptionally high β-glucosidase activities were determined during MBR operation.•Candidate Saccharibacteria were dominant at any landfill leachate concentration.•A massive shift in other bacterial taxa was observed...

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Veröffentlicht in:	Bioresource technology 2017-08, Vol.238, p.48-56
Hauptverfasser:	Remmas, Nikolaos, Melidis, Paraschos, Zerva, Ioanna, Kristoffersen, Jon Bent, Nikolaki, Sofia, Tsiamis, George, Ntougias, Spyridon
Format:	Artikel
Sprache:	eng
Schlagworte:	beta-Glucosidase Bioreactors Candidate phylum Dojkabacteria (candidate division WS6) Candidate phylum Saccharibacteria (candidate division TM7) Cryptomycota (Rozellomycota) Membrane fouling Membranes, Artificial Polymers Waste Water Water Pollutants, Chemical β-glucosidase
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Zusammenfassung:	•Organic load, salinity and NH4+-N influenced EPS and SMP during leachate treatment.•Exceptionally high β-glucosidase activities were determined during MBR operation.•Candidate Saccharibacteria were dominant at any landfill leachate concentration.•A massive shift in other bacterial taxa was observed at high organic loading rate.•The new fungal phylum Cryptomycota was predominant at high organic loading rate. A membrane bioreactor (MBR), accomplishing high nitrogen removal efficiencies, was evaluated under various landfill leachate concentrations (50, 75 and 100% v/v). Proteinous and carbohydrate extracellular polymeric substances (EPS) and soluble microbial product (SMP) were strongly correlated (p
ISSN:	0960-8524 1873-2976
DOI:	10.1016/j.biortech.2017.04.019