Effect of hydraulic retention time on chemical oxygen demand and total nitrogen removal in intermittently aerated constructed wetlands

   This study evaluated the effect of hydraulic retention time on chemical oxygen demand (COD) and total nitrogen (TN) removal in an intermittently aerated constructed wetlands. Two horizontal subsurface-flow constructed wetlands were used: one without aeration and the other aerated intermittently (...

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Bibliographic Details
Published in:Revista ambiente & água 2020, Vol.15 (3), p.1-11
Main Authors: Silva, Isabela Pires da, Costa, Gabriela Barbosa da, Queluz, João Gabriel Thomaz, Garcia, Marcelo Loureiro
Format: Article
Language:English
Subjects:
Aeration
Aquatic plants
Artificial wetlands
Chemical oxygen demand
Denitrification
Domestic wastewater
ecotechnology
Efficiency
effluent treatment
Effluents
ENGINEERING, ENVIRONMENTAL
Flow velocity
Flowers & plants
Hydraulic retention time
Hydraulics
Microorganisms
Nitrates
Nitrification
Nitrogen
Nitrogen removal
nutrients removal
Performance enhancement
Phosphorus
Removal
Retention
Retention time
Systems analysis
Wastewater
Wastewater treatment
Wetlands
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Summary:   This study evaluated the effect of hydraulic retention time on chemical oxygen demand (COD) and total nitrogen (TN) removal in an intermittently aerated constructed wetlands. Two horizontal subsurface-flow constructed wetlands were used: one without aeration and the other aerated intermittently (1 hour with aeration/7 hours without aeration). Both systems were evaluated treating domestic wastewater produced synthetically. The flow rate into the two CWs was 8.6 L day-1 having a hydraulic retention time of 3 days. The results show that the intermittently aerated constructed wetland were highly efficient in removing COD (98.25%), TN (83.60%) and total phosphorus (78.10%), while the non-aerated constructed wetland showed lower efficiencies in the removal of COD (93.89%), TN (48.60%) and total phosphorus (58.66). These results indicate, therefore, that intermittent aeration allows the simultaneous occurrence of nitrification and denitrification processes, improving the removal of TN in horizontal subsurface-flow constructed wetlands. In addition, the use of intermittent aeration also improves the performance of constructed wetlands in removing COD and total phosphorus.
ISSN:1980-993X
1980-993X
DOI:10.4136/ambi-agua.2504