Performance assessment of a vertical flow constructed wetland treating unsettled combined sewer overflow

The performance of a vertical flow constructed wetland for combined sewer overflow treatment (CSO CW) has been evaluated. The full-scale site has been monitored for 3 years for major pollutants and for two load events for a range of micropollutants (metals, metalloids and polycyclic aromatic hydroca...

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Bibliographic Details
Published in:Water science and technology 2017-06, Vol.75 (11-12), p.2586-2597
Main Authors: Pálfy, T G, Gerodolle, M, Gourdon, R, Meyer, D, Troesch, S, Molle, P
Format: Article
Language:English
Subjects:
Ammonium nitrogen
Aromatic compounds
Aromatic hydrocarbons
Artificial wetlands
Biological Oxygen Demand Analysis
Chemical oxygen demand
Combined sewer overflows
Duration
Dynamics
Environmental Engineering
Environmental factors
Environmental monitoring
Environmental Sciences
Evapotranspiration
France
Hydraulics
Inlets (waterways)
Loads (forces)
Metalloids
Metals
Overflow
Oxygen demand
Performance assessment
Performance testing
Pollutants
Pollution monitoring
Polycyclic aromatic hydrocarbons
Removal
Retention
Sewage - analysis
Sewer construction
Sludge
Suspended particulate matter
Technological change
Total suspended solids
Vertical flow
Vertical mixing
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Water Pollutants, Chemical - analysis
Water quality
Wetlands
Zeolites
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Summary:The performance of a vertical flow constructed wetland for combined sewer overflow treatment (CSO CW) has been evaluated. The full-scale site has been monitored for 3 years for major pollutants and for two load events for a range of micropollutants (metals, metalloids and polycyclic aromatic hydrocarbons (PAHs)). Performance were predominantly high (97% for total suspended solids (TSS), 80% for chemical oxygen demand (COD), 72% for NH -N), even if several loads were extremely voluminous, pushing the filter to its limits. Two different filter materials (a 4:1 mixture of sand and zeolite and natural pozzolana) showed similar treatment performance. Furthermore, environmental factors were correlated with COD removal efficiency. The greatest influencers of COD removal efficiency were the inlet dissolved COD concentrations and the duration and potential evapotranspiration during inter-event periods. Furthermore, sludge was analysed for quality and a sludge depth map was created. The map, and calculating the changes in sludge volume, helped to understand solid accumulation dynamics.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2017.126