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Sökning: WFRF:(Jeppsson A) > Rapport

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  • Jeppsson, Ulf, et al. (författare)
  • URWARE Wastewater Treatment Plant Models
  • 2005
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • 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.
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  • Jönsson, H, et al. (författare)
  • Composition of Urine, Feaces, Greywater and Biowaste for Utilisation in the URWARE Model
  • 2005
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • When analysing new types of sewage systems, knowledge is needed on the composition of the different wastewater fractions. The computer model URWARE, developed from the model ORWARE, is intended to analyse and compare different wastewater system structures, e.g. to compare wastewater systems where urine and/or faeces are source separated with conventional wastewater systems, where the different wastewater fractions are mixed with each other. To use URWARE for this purpose, knowledge was needed on the composition of the wastewater fractions urine, faeces and household greywater. Sometimes the compostable household waste is mixed into the wastewater by use of a food waste disposer and thus also the composition of the solid compostable household waste is needed. Thus, the objective of the present report was to collect the knowledge on the mass and composition of urine, faeces, greywater and compostable household waste in Sweden.
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