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Mathematical modeling is a useful tool for the design, analysis and
control of wastewater treatment systems. The activated sludge
process is one of the most common processes used in wastewater
treatment, and therefore is a particularly important candidate for
the application of mathematical models. In the 1980s, a task group
organized by the International Association on Water Quality (IAWQ)
developed a conceptual model of the activated sludge process, which
has become an industry-wide standard for the development of
computer-based activated sludge models. A recent version of the
IAWQ model incorporates 19 components, 17 processes, and numerous
rate and stoichiometric coefficients. It is difficult and costly to
quantify all of the necessary coefficients for any given
application of the model; consequently, it is important to identify
the most critical wastewater and biomass components and the
relevant coefficients to be quantified for the most common uses of
the model. It is also important to provide guidance to potential
model users on the use of default and/or estimated values for the
remaining parameters.
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