URWARE Wastewater Treatment Plant Models

Research output: Book/ReportReport


In this document, a large number of mathematical models describing various
physical, biological and chemical processes in a wastewater treatment
plant are presented. In most cases, the models are fairly simple as they are
inteded for steady-state simulations based on yearly averages of the influent
wastewater charteristics. The combination of models forms a software tool
namned URWARE (URban WAter REsearch model), which is a tool for
substance flow analysis and energy calculations in wastewater treatment
systems. All models are based on the MATLAB/Simulink platform.
The different models can be combined in any fashion thereby creating
various system structures that can be analysed and compared. The models
keep track of numerous substances related to wastewater, such as organic
substances, nutrients and to some extent heavy metals. Within all models the
release of environmentally hazardous substances to water, soil and air are
calculated. The results can be used as one (of many) information pathways
for strategic decision making related to urban water systems.
The individual models are described one by one and their behaviours are
exemplified by simulation results. In many cases, comparisons with other
available software models are given to validate (or at least make plausible)
the results produced by the fairly simple URWARE models. Simulation
results based on a combination of models into a complete wastewater
treatment plant are also presented. However, details about the underlying
theory and hypotheses on which the models are based cannot always be
sufficiently described due to space limitations. Moreover, users should always
be critical to any results predicted by models and not take them for
granted simply because they have been calculated by a computer model.
Knowledge about the real processes and comparisons with real data are
imperative to evaluate whether the predicted results are reasonable or not.
For the interested reader the complete source code to all models is included
in an extensive appendix.
A modelling task of this magnitude is never completed. The proposed
models can always be further developed, improved and refined. Consequently,
the models described in this document only represent the first
version of the URWARE software. Many issues remain to be solved and
further improvements to be done. However, it is the hope of the authors that
the presented models are mature enough to be used, evaluated, modified
and improved by other users outside the URWARE task group.


Research areas and keywords

Subject classification (UKÄ)

  • Other Electrical Engineering, Electronic Engineering, Information Engineering
Original languageEnglish
PublisherUrban Water, Chalmers University of Technology
Publication statusPublished - 2005
Publication categoryResearch

Publication series

NameUrban Water rapport
ISSN (Print)1650-3791

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