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Activated sludge characteristics in relation to stable foam formation
Author(s) -
Khan A. R.,
Kocianova E.,
Forster C. F.
Publication year - 1991
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280520310
Subject(s) - activated sludge , surface charge , chemical engineering , foaming agent , chemistry , materials science , sewage treatment , composite material , porosity , environmental engineering , environmental science , engineering
This paper examines the hydrophobicity and the surface charge of a range of foaming and nonfoaming activated sludges, together with an appraisal of the species involved. The results show that the solids in foaming sludges possess a higher hydrophobicity than those in nonfoaming sludges. The data also indicate that there are two distinct hydrophobicity/surface charge trends, depending on whether the sludges are foaming or nonfoaming. Sludges in which Nostocoida limicola was the dominant species did not conform to these patterns. In addition, the stability of the foam formed by these sludges was significantly lower.