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Göteborgs universitets publikationer

Effects of Wash-Out Dynamics on Nitrifying Bacteria in Aerobic Granular Sludge During Start-Up at Gradually Decreased Settling Time

Författare och institution:
Enikö Szabo (Institutionen för bygg- och miljöteknik, Chalmers); Malte Hermansson (Institutionen för kemi och molekylärbiologi); Oskar Modin (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik, Chalmers); Frank Persson (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik, Chalmers); Britt-Marie Wilén (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik, Chalmers)
Publicerad i:
Water, 8 ( 5 ) s. 172
ISSN:
2073-4441
Publikationstyp:
Artikel, refereegranskad vetenskaplig
Publiceringsår:
2016
Språk:
engelska
Fulltextlänk:
Fulltextlänk (lokalt arkiv):
Sammanfattning (abstract):
The aerobic granular sludge process is a promising technology for the removal of nutrients and organic contaminants from wastewater. However, a large amount of the sludge is often washed out during the start-up of granular reactors, which results in reduced process performance and a protracted start-up phase. In this study, the possibility of a rapid start-up of the nitrification process through a stepwise decrease of the settling time was investigated, and the bacterial population dynamics in two lab-scale sequencing batch reactors were studied. The results demonstrated that the stepwise decrease of the settling time enabled fast granulation and rapid start-up of the process. Small cores of granules were already observed after 10 days of operation, and the biomass was dominated by granules after 28 days. The removal of organic matter and ammonium was >95% after one day and 14 days, respectively. The bacterial community composition changed rapidly during the first 21 days, resulting in strongly reduced richness and evenness. The diversity increased at a later stage, and the bacterial community continued changing, albeit at a slower pace. The rate of the stepwise decrease in settling time strongly affected the abundance of nitrifying organisms, but not the general composition of the bacterial community. The results of this study support the idea that a stepwise decrease of the settling time is a successful strategy for the rapid start-up of aerobic granular sludge reactors.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
NATURVETENSKAP ->
Biologiska vetenskaper ->
Mikrobiologi
TEKNIK OCH TEKNOLOGIER ->
Naturresursteknik ->
Annan naturresursteknik ->
Miljöteknik
Nyckelord:
wastewater; aerobic granular sludge; nitrogen removal; microbial community dynamics; T-RFLP; qPCR
Chalmers styrkeområden:
Building Futures
Chalmers drivkrafter:
Hållbar utveckling
Postens nummer:
235765
Posten skapad:
2016-05-02 12:14
Posten ändrad:
2016-09-01 09:43

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