Horizontal subsurface flow constructed wetlands for tertiary treatment of dairy wastewater

The aim of this work was to evaluate the efficiency of horizontal subsurface flow constructed wetlands (HSFCWs) planted with Typha domingensis and Phragmites australis in the final treatment of dairy wastewater. Ten microcosms-scale reactors simulating HSFCWs were arranged outdoors under a semi-tran...

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Bibliographic Details
Published in:International journal of phytoremediation 2018-07, Vol.20 (9), p.895-900
Main Authors: Schierano, María Celeste, Panigatti, María Cecilia, Maine, Maria Alejandra
Format: Article
Language:English
Subjects:
Ammonium
Artificial wetlands
Biodegradation, Environmental
Chemical oxygen demand
Construction planning
Contaminants
Dairy industry wastewaters
dairy wastewater
Electrical conductivity
Electrical resistivity
Macrophytes
Microcosms
Nitrate removal
Nitrogen removal
Nutrient removal
Organic chemistry
Phosphorus
Phosphorus removal
Plastics
Pollutant removal
Reactors
Storm seepage
Substrates
Suspended solids
Tertiary treatment
Typha domingensis
Waste Disposal, Fluid
Waste Water - analysis
Wastewater treatment
Water Pollutants, Chemical - analysis
Water pollution treatment
Wetlands
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Summary:The aim of this work was to evaluate the efficiency of horizontal subsurface flow constructed wetlands (HSFCWs) planted with Typha domingensis and Phragmites australis in the final treatment of dairy wastewater. Ten microcosms-scale reactors simulating HSFCWs were arranged outdoors under a semi-transparent plastic roof. Five replicates were planted with T. domingensis and five with P. australis. In both cases, light expanded clay aggregate (LECA) 10/20 was used as a substrate. Real effluent with previous treatment was used. In order to evaluate contaminant removal efficiencies in each reactor, pH, electrical conductivity, suspended solids, ammonium, nitrate, nitrite, total phosphorus, and chemical oxygen demand (COD) were analyzed before and after treatment. HSFCWs planted with T. domingensis and P. australis were efficient for the final treatment of dairy wastewater. Removal efficiencies obtained in microcosms planted with both macrophytes were over 96% for ammonium and nitrite. Nitrate removal efficiency was 39%. COD decreased along the experiment near 75% for both treatments. High removal percentages for suspended solids (78.4-81.1%) were also achieved. However, systems planted with T. domingensis were significantly more efficient for total phosphorus removal (88.5%) than those planted with P. australis (71.6%).
ISSN:1522-6514
1549-7879
DOI:10.1080/15226514.2018.1438361