Phosphorus Removal in VFCWs with Lightweight Aggregates Made of Fly Ash from Sewage-Sludge Thermal Treatment (FASSTT LWA)

This study analyzed the effect of lightweight aggregates made of fly ash from sewage-sludge thermal treatment (FASSTT LWA) on the effectiveness of phosphorus removal from wastewater in vertical constructed wetlands (CWs), depending on FASSTT LWA content in the CW filling and hydraulic loading rate....

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Bibliographic Details
Published in:Water (Basel) 2023-05, Vol.15 (10), p.1955
Main Authors: Rodziewicz, Joanna, Mielcarek, Artur, Janczukowicz, Wojciech, Białowiec, Andrzej, Tavares, Jorge, Jóźwiakowski, Krzysztof, Thornton, Arthur
Format: Article
Language:English
Subjects:
Adsorption
Aggregates
Artificial wetlands
Constructed wetlands
Efficiency
Experiments
Fly ash
Gravel
Heat treatment
Hydraulic loading
Hydraulics
Lightweight
Lightweight aggregates
Load distribution
Loading rate
Lysimeters
Phosphorus
Phosphorus removal
Purification
Rural areas
Sewage
Sewage treatment plants
Sludge
Sustainable development
Thickness
Wastewater
Wastewater treatment
Wetlands
Zeolites
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Summary:This study analyzed the effect of lightweight aggregates made of fly ash from sewage-sludge thermal treatment (FASSTT LWA) on the effectiveness of phosphorus removal from wastewater in vertical constructed wetlands (CWs), depending on FASSTT LWA content in the CW filling and hydraulic loading rate. It was performed over 13 weeks using 15 lysimeters prepared as double-layer systems. An upper layer was made of FASSTT LWA above the gravel layer with different thicknesses of FASSTT LWA (CW 0 cm: only gravel; CW 12 cm, CW 25 cm; CW 50 cm, and CW 100 cm: only FASSTT LWA). Each filling variant was repeated three times. Wastewater with a mean phosphorus concentration of 7.43 mgP/L was fed to the lysimeters once a day. The hydraulic loading rates tested were 3.0, 5.0, and 7.0 mm/d. Both the increased FASSTT LWA content in the CW filling and the decreasing hydraulic loading rate were found to boost the effectiveness of phosphorus removal in the treated wastewater. Constructed wetland filled in 100 % with FASSTT LWA ensured a reduction in phosphorus concentration below 2.0 mg P/L at all hydraulic loading rates tested.
ISSN:2073-4441
2073-4441
DOI:10.3390/w15101955