REMOVAL OF NITROGEN AND ORGANIC MATTER IN AN INTERMITTENTLY AERATED HORIZONTAL SUBSURFACE FLOW CONSTRUCTED WETLAND

Authors

  • João Gabriel Thomaz Queluz São Paulo State University (Unesp), Enviromental Studies Center, Rio Claro Campus. https://orcid.org/0000-0002-8670-533X
  • Marcelo Loureiro Garcia São Paulo State University (Unesp), Institute of Geosciences and Exact Sciences, Rio Claro Campus. https://orcid.org/0000-0002-6002-3840

DOI:

https://doi.org/10.4090/juee.2020.v14n2.175-181

Keywords:

Constructed wetland, intermittent aeration, nitrogen removal, COD removal.

Abstract

The objective of this work was to evaluate the effect of intermittent aeration on the removal of ammonium (NH4+), total nitrogen (TN) and chemical oxygen demand (COD) in a horizontal subsurface flow constructed wetland (HFCW). Two HFCWs were studied, one non-aerated and another aerated intermittently, and both cultivated with Typha latifolia. Each system received 8.6 L day-1 of synthetic wastewater, resulting in 3 days of hydraulic retention time. The two systems displayed high efficiencies in the removal of COD (>90%); however, the intermittently aerated HFCW showed a higher rate of COD removal. Additionally, the removal of TN (48.8%) and NH4+ (57.7%) in the non-aerated system was limited, while in the aerated system, the efficiencies of TN (81.2%) and NH4+ (98.6%) removal were satisfactory. Thus, the results indicate that via intermittent aeration, nitrification and denitrification occur simultaneously, improving the performance of HFCW in the removal of TN and NH4+.

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Author Biographies

João Gabriel Thomaz Queluz, São Paulo State University (Unesp), Enviromental Studies Center, Rio Claro Campus.

Postdoctoral Researcher

Marcelo Loureiro Garcia, São Paulo State University (Unesp), Institute of Geosciences and Exact Sciences, Rio Claro Campus.

Associate Professor

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Published

2020-12-15

Issue

Vol 14, No 2 (2020)

Section

Articles

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