000134102 001__ 134102
000134102 005__ 20181119101858.0
000134102 037__ $$aSTUDENT
000134102 245__ $$aAerobic granular sludge reactor technology Aerobic  granulation in bubble column reactor at unregulated  temperature
000134102 260__ $$c2006
000134102 269__ $$a2006
000134102 336__ $$aStudent Projects
000134102 520__ $$aAerobic granular sludge technology offer a possibility to  design compact wastewater treatment plant based on  simultaneous COD, nitrogen and phosphate removal in a  sequencing batch reactor.Simultaneous nutriment removal  was possible, because of heterotrophic growth inside the  granules (denitrifying and PAO organisms). Selection for  slow growing organisms such as PAO organisms (byincrease  of the feeding period time) also allow to improve granule  stability and density. This study was aimed to investigate  the granule formation under aerobic conditions and to gain  insightinto the mechanisms responsible for aerobic  granulation. The study was conducted in two bubblecolumn  reactors the only difference was feeding mode. In the  first reactor pulse feeding was applied and in the second  reactor long term feeding under anaerobic condition was  applied. The temperature inthe reactor was not regullated  and depend on room temperature (30 ± 5 °C) and humidity.  In the anaerobic feeding reactor, smooth granules were  obtained in a first period, then they become fluffy and  washout from the reactor. Increases of shear lead to  recover the system. In about two weeks, smooth and dense  granules were obtained.During the experiment granules were  unstable, theirs density vary between 46 and 56 g VSS/l of  granulesand their average size fluctuated between 1.1 and  2.3 mm. Several time biomass washouts occur for unknown  reasons; the reactor never reaches the steady state  condition. Nitrogen and phosphate removal were not occur,  consequently, its lead to the conclusion thatdenitrifying  and PAO organisms were not present in system. Granules  instability could be explained by the absence of these  organisms and by the temperature fluctuations.  In pulse  feeding reactor, due to a pH accident, granules disappear  letting place to fluffy organisms. Those fluffy organisms  reappear in the system after a complete wash and restart  of the reactor. Fluffyorganism out compete proper granules  and the flocs size became considerably high. The fluffy  organisms present in both reactors seem to be yeast like  fungi: Geotrichum sp.
000134102 6531_ $$aWastewater treatment
000134102 6531_ $$agranule sludge
000134102 6531_ $$asequencing batch airlift reactor
000134102 6531_ $$abiofilms
000134102 6531_ $$aaerobic granules
000134102 700__ $$aGabus, Sébastien
000134102 720_2 $$0240405$$aHolliger, Christof$$edir.$$g121849
000134102 909C0 $$0252125$$pLBE
000134102 909C0 $$0252601$$pSSIE
000134102 909CO $$ooai:infoscience.tind.io:134102$$pENAC
000134102 917Z8 $$x106673
000134102 937__ $$aLBE-STUDENT-2009-002
000134102 973__ $$aEPFL$$sPUBLISHED
000134102 980__ $$aSTUDENT$$bMASTERS