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Comments on: “A dynamic kinetic model of the activated sludge process”

✍ Scribed by H. W. Blanch

Publisher
John Wiley and Sons
Year
1978
Tongue
English
Weight
74 KB
Volume
20
Category
Article
ISSN
0006-3592

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✦ Synopsis

The recent article by Chase' on the development of a dynamic model of the activated sludge process contains some difficulties related to the use of the nomenclature dS,/dt for the constitutive rate expression for substrate consumption. The usual chemical engineering practice is to denote a constitutive rate expression, for example, for substrate utilization, as r S -, and this avoids any problems when the non-steady-state mass balances for the substrate are written.

Chase has developed a series of mass balances for substrate in batch and continuous culture, using the derivative of dS./dt as a dependent variable. These equations (eqs. (15)-( 19) in his paper) involve the variables S and X. As dS./dt is a function of substrate concentration S and organism concentration X, they cannot be integrated directly to provide solutions for S as a function of time. This can be seen from the differential expression below: d t ( d t

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