Design-oriented evaluation of the hydrodynamics in a full-scale combined filter-lamella separator for urban stormwater treatment

Author:

Stricker Max1ORCID,Littfinski Tobias1,Heinz Eva1,Pecher Klaus Hans2,Lübken Manfred1,Grüning Helmut3,Wichern Marc1

Affiliation:

1. a Department of Civil and Environmental Engineering, Institute of Urban Water Management and Environmental Engineering, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum 44801, Germany

2. b Dr. Pecher AG, Klinkerweg 5, Erkrath 40699, Germany

3. c Faculty of Energy, Building Services, Environmental Engineering, University of Applied Sciences Münster, Stegerwaldstraße 39, Steinfurt 48565, Germany

Abstract

Abstract The development of compact treatment devices with high removal efficiencies and low space requirements is a key objective of urban stormwater treatment. Thus, many devices utilize a combination of sedimentation and upward flow filtration in a single system. This study, for the first time, evaluates the flow field inside a combined filter-lamella separator via computational fluid dynamics. Herein, three objectives are investigated: (i) the flow field for different structural configurations, (ii) the distribution of particulate matter along the filter bed and (iii) the dynamic clogging in discrete filter zones, which is addressed by a clogging model derived from literature data. The results indicate that a direct combination of a filtration stage with a lamella separator promotes a uniform flow distribution. The distribution of particulate matter along the filter bed varies with configuration and particle size. Clogging, induced by particles in the spectrum <63 μm, creates gradients of hydraulic conductivity along the filter bed. After treating about half of Germany's annual runoff-efficient precipitation at a rainfall intensity of 5 L/(s·ha), the filtration rates increase in the front of the filter bed by +10%. Thus, long-term operating behavior is sensitive to efficient filter utilization in compact treatment devices. HIGHLIGHTS A holistic approach is used to capture the system behavior concerning hydrodynamics, filter resistance and filter clogging. The filter media improves the distribution of flow in the lamella stage. Larger particles utilize only about 50% of the filter area due to inertia effects. Gradients of hydraulic conductivity regionally alter filtration rates and flow rates in the inclined plates.

Funder

Ministry of Culture and Science of the State of North-Rhine Westphalia, Germany

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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