Abstract：
:The aim of this research was to evaluate a constructed wetland system (CW) operated under aerobic-anoxic-aerobic conditions to remove C, N and P from water with high concentrations of the last two nutrients. A series of three CW were operated continuously for 190 days. An aerobic vertical CW was used in the first and third stages and an anoxic horizontal CW was used in the second stage. The total nitrogen (TN) removal efficiency was 70 ± 1.5%. Similar removal efficiency behavior was observed in others nitrogen compounds, where a removal of 85 ± 1.5% for NO3--N and 97 ± 2.2% for NH3+N were achieved. The combination of different oxygen conditions enhanced oxidation of nitrates and the assimilation of ammonium by vegetation. On the other hand, 54 ± 6.5% total phosphorus (TP) was removed in the entire system, which is higher than the reported in several investigations, including mechanized and controlled systems such as activated sludge. The phosphorous removal efficiency was attributed to the adequate design and configuration of CW, which facilitated dissolved oxygen (DO) conditions required for phosphorus capture. Despite in this investigation the CW was not designed for an optimal removal of organic matter the removal efficiency of this parameter was 64 ± 7.5%. The successful results suggest that the combination of aerobic-anoxic-aerobic stages is a technically suitable option for the treatment of agricultural wastewater with high content of N and P.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Roé-Sosa A,Rangel-Peraza JG,Rodríguez-Mata AE,Pat-Espadas A,Bustos-Terrones Y,Diaz-Peña I,Vu CM,Amabilis-Sosa LEdoi
10.1016/j.jenvman.2019.01.114subject
Has Abstractpub_date
2019-04-15 00:00:00pages
351-357eissn
0301-4797issn
1095-8630pii
S0301-4797(19)30128-8journal_volume
236pub_type
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