Author(s): Da Silva, Isabela Pires [UNESP] ; Da Costa, Gabriela Barbosa [UNESP] ; Queluz, João Gabriel Thomaz [UNESP] ; Garcia, Marcelo Loureiro [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/200508
Origin: Oasisbr
Subject(s): Ecotechnology; Effluent treatment; Nutrients removal; Ecotechnology; Ecotechnology; Effluent treatment; Effluent treatment; Nutrients removal; Nutrients removal
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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.
Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Avenida 24-A, n° 1515
Centro de Estudos Ambientais Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Avenida 24-A, n° 1515
Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Avenida 24-A, n° 1515
Centro de Estudos Ambientais Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Avenida 24-A, n° 1515
