Premium
Design and verification of a model secondary clarifier for activated sludge
Author(s) -
Grijspeerdt Koen,
Bogaert Herwig,
Verstraete Willy
Publication year - 1996
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/(sici)1097-4660(199612)67:4<404::aid-jctb592>3.0.co;2-m
Subject(s) - clarifier , tracer , scraper site , full scale , environmental science , scale (ratio) , scaling , environmental engineering , process engineering , engineering , mathematics , structural engineering , mechanical engineering , physics , geometry , quantum mechanics , nuclear physics
A model clarifier was designed using conventional methods for the surface calculation and an alternative pathway for the determination of the height and constructed accordingly. In addition, a new approach was used to evaluate the necessary scraper speed in comparison to full‐scale clarifiers. Scaling effects were taken into account. The model clarifier was first tested by tracer experiments. Conductivity measurements were used for the clarification zone, whereas the thickening zone was tested using pyrene as an organic tracer compound. Finally, the behaviour of the model clarifier was compared with a full‐scale settler. The results indicated that operation of the model clarifier was representative of full‐scale behaviour, except for severe overloads. Hence, the small‐scale clarifier qualified as a model for small‐scale studies and could be installed on large‐scale plants to monitor more transparently plant performance and sludge behaviour