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Relationship between floc composition and flocculation and settling properties studied at a full scale activated sludge plant

Britt-Marie Wilén (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik) ; Dough Lumley ; Ann Mattsson ; Takashi Mino
Water Research (0043-1354). Vol. 42 (2008), 16, p. 4404-4418.
[Artikel, refereegranskad vetenskaplig]

The variation in activated sludge floc composition, flocculation and settling properties were studied at a full scale plant over a two year period. A comprehensive set of process parameters was analysed and related to the floc properties to increase the understanding of the factors affecting floc formation. The composition of the activated sludge showed a seasonal change with higher concentrations of extractable extracellular polymeric substances (EPS) during the winter months. The protein content of the total sludge and EPS increased significantly during the winter. This coincided with higher effluent suspended solids concentrations and increased shear sensitivity of the sludge flocs. Only poor correlations between EPS contents and stirred sludge volume index (SSVI) could be observed. High iron concentrations in the sludge due to dosage of iron salt to precipitate phosphorus was found to have a negative impact on the settling and compaction properties of the sludge, whereas it had a positive impact on floc stability. Higher organic loading due to by-passed primary settlers lead to improved settling and compaction properties.

Nyckelord: Activated sludge, extracellular polymeric substances (EPS), floc composition, shear sensitivity, settleability, wastewater composition

Denna post skapades 2008-09-30. Senast ändrad 2016-02-01.
CPL Pubid: 74630


Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik



Chalmers infrastruktur