Modeling transport and removal of stormwater contaminants in a dual porosity filter : a novel treatment technology
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Vestergaard, Stine Lundbøl1, Forfatter
Jensen, Marina Bergen1, Vejleder
Holm, Peter E.1, Vejleder
Jensen, Jørgen Krogsgaard1, Vejleder
1Det Biovidenskabelige Fakultet, København, Danmark
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 Abstract: Abstract: A new technology for stormwater treatment, entitled Dual Porosity Filtration (DPF), is currently being tested and developed. A DPF basically consist of alternate flow- and calcite-grain storage compartments (filter bed). To earn its right among other stormwater best management practices (BMPs) it demands for the technology to be characterized and documented. The objectives of this thesis are to create a mathematical model describing the DPF pilot plant and the processes acting within it, to critically discuss the model, the available data and the obtained model results. It has been proven that the fundamental principle behind the DPF technology is suitable for an efficient removal of stormwater pollutants. The next step is to characterize the technology and from this identify the main unit operation processes and their relative significance to the removal of contaminant. Various approaches may be taken in order to characterize a stormwater treatment facility. One approach for characterization is theuse of a mathematical simulation tool, from which in depth knowledge on the relative significance of each of the involved transport and removal processes can be obtained. Such characterization could be important to further optimization. One such mathematical simulation tool is DHI´s software packet MIKE 11. MIKE 11 is a one-dimensional model that simulates flows, mass transport and mass transfer processes. The central part of MIKE 11 is a hydrodynamic simulation module, responsible for the calculations on flow. The hydrodynamic module is dynamically coupled with modules covering a wide range of processes, representing a complete numerical laboratory for ecological modeling.Focus in this study is on reactive contaminants, represented by heavy metals. Besides the advective and dispersive transport a full description of the mechanisms affecting the fate of heavy metals includes transport of dissolved and particulate heavy metals through diffusive and sedimentation processes respectively. The transfer processes accounts for the distribution between the dissolved and particulate phase. Model simulations and characterization of the DPF processes is based on field experiments expected to cover diffusion, sedimentation and sorption-desorption processes, by following the fate of bromide, suspended solids and some of the commonly identified heavy metals, respectively.Bromide is used to size the diffusion of dissolved solutes in the system. However it is expected that the pattern of the diffusion is biased by the fact that bromide apparently does not act strictly conservative in the DPF. For particulate heavy metals and other particulate pollutants sedimentation is the main contributor to the removal. The available DPF data do not provide much insight into the removal of dissolved heavy metals due to the metals being largely associated with suspended solids at arrival to the DPF-plant. However, from theory on the heavy metals in focus an efficient sorption to the filter bed material of the dissolved heavy metals is expected.From the extensive modeling performed in this study it can be concluded that the precision of the model work and the obtained model results all to a great extend is limited and biased by the short comes of the available data.The model results themselves are not considered to be the main result of this study, however they do provide insight to the DPF and the processes important to the transport and removal of stormwater pollutants. Emphasis is on the critical approach to the model and data, and whether the degree of detail of the data and the choice of model complies with the purpose of the study.
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 Type: Speciale
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Sprog: English - eng
 Datoer: 2009
 Sider: 98 pages
 Publiceringsinfo: København, Danmark : Skov & Landskab
 Indholdsfortegnelse: -
 Note: Agricultural Science, Agronom
 Type: Speciale
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