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Technische Universität München Kordula Schwarzwälder Flow3D Madrid Simulation of fate and transport of fecal indicator bacteria (FIB) with FLOW-3D.

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Presentation on theme: "Technische Universität München Kordula Schwarzwälder Flow3D Madrid Simulation of fate and transport of fecal indicator bacteria (FIB) with FLOW-3D."— Presentation transcript:

1 Technische Universität München Kordula Schwarzwälder Flow3D Madrid Simulation of fate and transport of fecal indicator bacteria (FIB) with FLOW-3D

2 Technische Universität München Project Why simulating bacteria? FIBs in river Isar due to CSOs we need to know the processes and rates of sedimentation and resuspension of FIBs and we need to quantify the influence of the biofilm

3 Technische Universität München Project What we need and how we get it…. Through experimental work investigate interaction of FIB between bulk phase and biofilm Develop a model which describes/quantifies transport and turnover processes observed in experiments and incorporates hydrodynamics of Isar

4 Technische Universität München Actors… Bacteria are of different size, density, shape…. a) E. coli b) Enterococci c) Clumps of E. coli and Cocci (http://www.sciencephoto.com) a) b)

5 Technische Universität München Actors… They can be found as freely suspended bacteria and clumps, as well as particle associated. Clumps of E. coli and Cocci (http://www.sciencephoto.com)

6 Technische Universität München Actors… Biofilm is a thin film with a special roughness and the ability to embed bacteria

7 Technische Universität München Actors… app. 25 mm Biofilm can be very stong and thin….

8 Technische Universität München Biofilm and Waste Water (E. Walters)

9 Technische Universität München Processes Suspended particles Erosion Abrasion Shearing Particle- associated microbes Freely suspended/aggl. of microbes Desorption Sorption Point Source e.g. CSO Consolidation UV Inactivation Transport Growth? Decay Sedimentation & Resuspension Point Source e.g. CSO Sedimentation & Resuspension Biofilm- associated microbes Sediment- associated microbes (K.Schwarzwälder, E. Walters)

10 Technische Universität München Processes with special interest How to simulate sedimentation of bacteria: Contaminant transport? Particle transport/Sediment module? How to consider the biofilm: Source/Sink? Roughness?

11 Technische Universität München Data acquisition

12 Technische Universität München L = 1.2 m; W = 7.1 cm; D = 4 cm Substratum = Ceramic bathroom tiles Bulk Phase = Isar Water Q = 290 cm³/s u = 10 cm/s 2.3 cm × 2.3 cm Small scale flume in Garching

13 Technische Universität München L = 12 m; W = 0.5 m; D = 0.5 m Substratum = Isar gravel Bulk Phase = Isar Water Q = 200 l/s u = 80 cm/s 2.3 cm × 2.3 cm Large scale flume in Obernach

14 Technische Universität München (E. Walters, K.Schwarzwälder) Results

15 Technische Universität München (E. Walters, K.Schwarzwälder) Results

16 Technische Universität München (K.Schwarzwälder, M. Graml) Results

17 Technische Universität München 17 Flume in FLOW-3D

18 Technische Universität München Problems Simulating bacteria as concentration can work, but we have to simulate interaction bacteria / biofilm as well?! How should we deal with UV-inactivation if we are not simulating particles? How can we simulate the biofilm?

19 Technische Universität München as contamination.... Convective diffusion Convective diffusion in vector notation

20 Technische Universität München as contamination.... Temporal change Advective transport Diffusive transport Reaction k j rate constant of reaction j n jn order of reaction j with respect to constituent n

21 Technische Universität München (K.Schwarzwälder) Problems Interaction with biofilm?

22 Technische Universität München (K.Schwarzwälder) Problems Roughness? Too big for roughness in Geometry Too natural for this artificial roughness below…

23 Technische Universität München (K.Schwarzwälder) Problems…

24 Technische Universität München Thank you for your attention! Project DFG funded Kordula Schwarzwälder Eve Walters


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