Performance of Cyperus papyrus in constructed wetland mesocosms under different levels of salinity

Constructed wetlands (CWs) are consolidated technologies used for removing organic matter (OM) and nutrients (nitrogen (N) and phosphorus (P)) from wastewater. Recently, these systems have been implemented for treating wastewater under saline conditions. In this context, the aim of this study was to...

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Bibliographic Details
Published in:Ecological engineering 2020-05, Vol.151, p.105820, Article 105820
Main Authors: Sepúlveda, Rodrigo, Leiva, Ana María, Vidal, Gladys
Format: Article
Language:English
Subjects:
Artificial wetlands
Bioaccumulation
Biochemical oxygen demand
Chemical oxygen demand
Chlorophyll
Chlorophylls
Constructed wetlands
Contaminants
Control systems
Cyperus papyrus
Electrical conductivity
Electrical resistivity
Mesocosms
Mineral nutrients
Nitrogen
Nutrient concentrations
Nutrients
Organic matter
Organic phosphorus
Phosphorus
Plant tissues
Pollutant removal
Removal
Salinity
Salinity effects
Salinity tolerance
Salt tolerance
Sodium
Storm seepage
Tissue
Total oxygen demand
Vegetation
Wastewater
Wastewater treatment
Wetlands
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Summary:Constructed wetlands (CWs) are consolidated technologies used for removing organic matter (OM) and nutrients (nitrogen (N) and phosphorus (P)) from wastewater. Recently, these systems have been implemented for treating wastewater under saline conditions. In this context, the aim of this study was to evaluate the effect of wastewater with different levels of salinity, expressed as electrical conductivity (EC), on the removal efficiencies of OM and on the growth of vegetation planted in CW mesocosms. For this, five horizontal subsurface flow constructed wetlands (HSSFs) planted with Cyperus papyrus were operated under different salinity levels: 1 (CW-C), 2.5 (CW-2.5), 5 (CW-5), 7.5 (CW-7.5) and 10 mS/cm (CW-10) using CW-C as a control system. To analyze the effects of different salinity levels, the removal efficiencies of chemical oxygen demand (COD) and biological oxygen demand (BOD5) were evaluated. Moreover, the growth characteristics of Cyperus papyrus were compared in the different CWs through the determination of chlorophyll concentration and nutrient contents in different plant tissues. The results of this study showed that the removal efficiencies of OM were above 50%. Regarding the effect of salinity on the removal of contaminants, the COD and BOD5 removals decreased 18% and 31%, respectively, from CW-C to CW-10 (p 
ISSN:0925-8574
1872-6992
DOI:10.1016/j.ecoleng.2020.105820