A comprehensive insight into floc characteristics and their impact on compressibility and settleability of activated sludge

摘要: This paper presents a comprehensive study of sludge floc characteristics and their impact on compressibility settleability activated in full scale wastewater treatment processes. The flocs were characterised by morphological (floc size distribution, fractal dimension, filament index), physical (flocculating ability, viscosity, hydrophobicity surface charge) chemical (polymeric constituents metal content) parameters. Compressibility defined terms the volume index (SVI) zone settling velocity (ZSV). properties had important influence settleability. Sludges containing large high quantities filaments, corresponding to lower values dimension (D-f), demonstrated poor Sludge with flocculating ability SVI higher ZSV, whereas hydrophobicity, negative charge viscosity correlated low ZSV. quantity polymeric compounds protein. humic substances carbohydrate extracted extracellular (EPS) significant positive correlations SVI. ZSV was quantitatively independent constituents. High concentrations EPS related cationic ions Ca, Mg, Al Fe improved significantly (C) 2003 Elsevier Science B.V. All rights reserved.