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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
Isabela Pires da Silva ; Gabriela Barbosa da Costa ; João Gabriel Thomaz Queluz ; Marcelo Loureiro Garcia [4]
Total Authors: 4
Document type: Journal article
Source: Rev. Ambient. Água; v. 15, n. 3 2020-06-08.
Abstract

Abstract 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. (AU)

FAPESP's process: 18/04320-3 - Removal of COD and total nitrogen in constructed wetlands with intermittent aeration in relation to hydraulic detention time
Grantee:Isabela Pires da Silva
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 19/20793-1 - Dynamic modeling of intermittently aerated horizontal subsurface-flow constructed wetlands
Grantee:Marcelo Loureiro Garcia
Support Opportunities: Regular Research Grants
FAPESP's process: 17/18075-8 - Efficiency evaluation and dynamic modeling of intermittently aerated horizontal subsurface-flow constructed wetlands
Grantee:João Gabriel Thomaz Queluz
Support Opportunities: Scholarships in Brazil - Post-Doctoral