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Effects of oxidation on NOM molecular weight distribution and membrane foling
Art der Abschlussarbeit
Diplomarbeit
Autoren
- Winter, Jörg
Betreuer
- Prof. Dr.-Ing. Wolfgang Uhl
Weitere Betreuer
Herr Pierre Bérubé
Abstract
The present study investigated the fate of natural organic matter (NOM) during oxidation and membrane filtration of model water containing Suwannee River dissolved organic matter (SRDOM). Thereby a main focus were the changes in the structure of NOM and their effects on the fouling behavior of ultrafiltration and nanofiltration ceramic membranes. SRDOM was oxidised using ozone and UV/H2O2 and filtered through ceramic membranes with molecular weight cut offs (MWCOs) of 1, 8, 50 and 150 kDa. Both oxidation processes resulted in a significant decrease in DOC concentration. Molecular weight analyses indicated that oxidation predominantly affected the content of higher molecular weight NOM fractions. Both ozone (at 2 mg ozone per mg DOC) and UV/H2O2 (at 10 mg/L H2O2 + 4000 mJ/cm2 UV) decreased the flux decline for membranes with MWCOs of 150 and 50 KDa. Only ozonation was able to decrease the extent of fouling for the membrane with a MWCO of 8 KDa. Ozonation with an extended dosage was needed to affect the fouling of the membrane with a MWCO of 1 KDa. Thereby changes in the size of NOM seem to be a crucial factor for the effect of oxidation on the extent of fouling.
Zugeordnete Forschungsschwerpunkte
- Membranverfahren
Schlagwörter
membrane filtration; ultrafiltration
Berichtsjahr
2010