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Volume 7, Issue 6(Suppl) J Chromatogr Sep Tech
ISSN: 2157-7064 JCGST, an open access journal
Page 28
Notes:
Separation Techniques 2016
September 26-28, 2016
conferenceseries.com
Separation Techniques
September 26-28, 2016 Valencia, Spain
2nd International Conference and Expo on
Impact of sludge properties on solid-liquid separation of activated sludge
Morten Lykkegaard Christensen
Aalborg University, Denmark
S olid-liquid separation of activated sludge is important both during the biological treatment of wastewater and for dewatering
of excess sludge. The separation of solid from the treated wastewater can be done by using clarifiers (conventional plants)
or membranes (MBR). Further, excess sludge is usually mechanical dewatered before further handling. Solid-liquid separation
is a costly part of wastewater treatment. The separation process depends on the composition and the properties of the sludge.
Sludge contains sludge flocs, filaments, single cells, dissolved extracellular polymeric substances (EPS) and ions. The best
separation is obtained for sludge that contains strong, compact flocs without single cells and EPS. Di and trivalent ions improve
the floc strength and improve the separation whereas monovalent ions (e.g. from road salt, sea water intrusion and industry)
impairs the separation. High pH e.g. due to the inlet flow impairs the separation process due to floc disintegration. Inmembrane
operation, single cells and dissolved EPS clogs the membrane whereas strong sludge flocs courses the membrane and thereby
reduce membrane fouling. In filtration dewatering small cells and EPS, blinds the cake and thereby lowers the dewaterability.
Thus, in all separation processes single cells and dissolved EPS should be avoid e.g. anaerobic storage and high shear levels
should be avoid as this erode the flocs and results in more single cells. Sludge can be aerated during storage or nitrate added
to avoid anaerobic condition. Further, pumping and mixing should be gently and pipes with sharp bends should be avoided.
Biography
Morten Lykkegaard Christensen has completed his PhD from Aalborg University, Denmark. He is currently an Associate Professor at Aalborg University and Head
of the Separation Science Group. He has published more than 40 papers in reputed journals.
Morten Lykkegaard Christensen, J Chromatogr Sep Tech 2016, 7:6(Suppl)