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Analysis of final settling tank in relation to control of metal inhibition in the activated sludge process
Author(s) -
Tyagi R. D.,
Couillard D.,
Tran F. T.
Publication year - 1991
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450690219
Subject(s) - settling , activated sludge , sedimentation , separator (oil production) , environmental science , bioreactor , process (computing) , process engineering , settling time , waste management , environmental engineering , sediment , chemistry , computer science , sewage treatment , engineering , geology , control engineering , physics , paleontology , organic chemistry , step response , thermodynamics , operating system
The design choices for the bioreactor and the final cell separator or settler in an activated sludge process are interrelated. Any physical or chemical disturbance in the bioreactor and subsequent use of parameters to control the disturbance will affect the performance of the settler. This paper shows how these factors can be integrated into a design concept leading to an optimum settler size. Mathematical relationships between sludge solids concentration, recycle, ratio, and sludge settling velocity in relation to metal inhibition have been derived, and the utility of a rational analysis of final settling tank thickening performance has been demonstrated. First laboratory batch sediment tests are used to characterize sludge sedimentation, then the mathematical expressions are used to estimate the performance of the final settling tank.