The effect of aeration and recirculation on a sand-based hybrid constructed wetland treating low-strength domestic wastewater

The effect of aeration and recirculation on a sand-based hybrid constructed wetland treating low-strength domestic wastewater

The Duplex-constructed wetland (CW) is a hybrid system composed of a vertical flow (VF) CW on top of a horizontal flow filter (HFF). Each compartment is designed to play a different role: aerobic treatment in the VF CW due to intermittent feeding and anoxic treatment in the HFF due to saturated cond...

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Bibliographic Details
Published in:Environmental technology Vol. 37; no. 15; pp. 1923 - 1932
Main Authors: Zapater-Pereyra, M., Kyomukama, E., Namakula, V., van Bruggen, J.J.A., Lens, P.N.L.
Format: Journal Article
Language:English
Published: England Taylor & Francis 02-08-2016
Taylor & Francis Ltd
Subjects:
Aeration
Air
Biodegradation, Environmental
Compartments
Control systems
Equipment Design
Guidelines
hybrid constructed wetland
low-strength domestic wastewater
Materials selection
Nitrogen
Nitrogen removal
Pollutants
recirculation
Silicon Dioxide
Waste Disposal, Fluid - instrumentation
Waste Water - chemistry
Wetlands
British Isles
Aeration
recirculation
low-strength domestic wastewater
hybrid constructed wetland
nitrogen
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Summary:The Duplex-constructed wetland (CW) is a hybrid system composed of a vertical flow (VF) CW on top of a horizontal flow filter (HFF). Each compartment is designed to play a different role: aerobic treatment in the VF CW due to intermittent feeding and anoxic treatment in the HFF due to saturated conditions. Three Duplex-CWs were used in this study: Control, Aerated and Recirculating. The role of each compartment was tested for pollutant removal and micro-invertebrate abundance. In all systems, the VF CW removed mainly organic matter, solids and NH 4 + -N. Pathogens were removed in both compartments. Likewise, total nitrogen removal occurred in both compartments, only the Recirculating HFF was not able to denitrify the nitrogen due to the slightly more oxic conditions as compared to the other systems. All systems met discharge guidelines for organic matter, but only the Control and Aerated systems met those for total nitrogen. At the applied loading rates, the pollutant removal was not significantly enhanced by the use of aeration and recirculation. Therefore, operation as in the Control system, without aeration or recirculation, is recommended for the tested Duplex-CWs. If artificial aeration will be used in CWs, the support material should be carefully selected to allow a proper air distribution.
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content type line 23
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2015.1135994