Hydraulic & Design Parameters in Full-Scale Constructed Wetland & Treatment Units: Six Case Studies

Ioannidou, Vasiliki G. and Pearson, Jonathan M. Hydraulic & Design Parameters in Full-Scale Constructed Wetland & Treatment Units: Six Case Studies. Environmental Processes. pp. 1-18. ISSN 2198-7491

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Abstract

The efficiency of pond and constructed wetland (CW) treatment systems, is influenced by the internal hydrodynamics and mixing interactions between water and aquatic vegetation. In order to contribute to current knowledge of how emergent real vegetation affects solute mixing, and on what the shape and size effects are on the mixing characteristics, an understanding and quantification of those physical processes and interactions was evaluated.
This paper presents results from tracer tests conducted during 2015-2016 in six full-scale systems in the UK under different flow regimes, operational depths, shapes and sizes, and in-/outlet configurations. The aim is to quantify the hydraulic performance and mixing characteristics of the treatment units, and to investigate the effect of size and shape on the mixing processes. Relative comparison of outlet configuration, inflow conditions, and internal features between the six different treatment units showed variations in residence times of up to a factor of 3. A key outcome of this study, demonstrated that the width is a more important dimension for the efficiency of the unit compared to the depth. Results underlined the importance of investigating hydrodynamics and physics of flow in full-size units to enhance treatment efficiency and predictions of water quality models.

Item Type: Article
Additional Information: ACKNOWLEDGEMENTS The work has been financially supported by the School of Engineering, University of Warwick, through a PhD scholarship for V. Ioannidou. The authors gratefully acknowledge the RSPB Hope Farm staff invaluable support, kind collaboration, and permission to access their wetlands; The Coal Authority staff for their productive collaboration, and access to their facilities in Derbyshire and Yorkshire; the technical support from Ian Baylis in the School of Engineering, University of Warwick. A previous shorter version of the paper has been presented in the 10th World Congress of EWRA’’Panta Rei’’ Athens, Greece, 5-9 July 2017.
Uncontrolled Keywords: LIST OF ACRONYMS CW Constructed Wetland HRT Hydraulic Residence Time RSPB Royal Society of Bird Protection SW1 South Wetland 1 SW2 South Wetland 2 NW North Wetland A-WMTS A-Winning Minewater Treatment Scheme RTD Residence Time Distribution CSTR Completely Stirred Tank Reactor TIS Tank In Series ERAR Environmental Risk Assessment Research CRD Chemical Regulatory Directorate
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
H100 General Engineering
H200 Civil Engineering
Divisions: Faculty of Computing, Engineering and the Built Environment
Faculty of Health, Education and Life Sciences > School of Health Sciences
Research, Innovation, Enterprise and Institutes > Institute for Sustainable Futures
UoA Collections > REF 2021 UoA12: Engineering
UoA Collections > REF2021 UoA13: Architecture, Built Environment and Planning
UoA Collections > Doctoral Theses Collection
Depositing User: Vasiliki Ioannidou
Date Deposited: 13 Jul 2018 08:47
Last Modified: 13 Jul 2018 08:47
URI: http://www.open-access.bcu.ac.uk/id/eprint/6128

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