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http://hdl.handle.net/20.500.12207/5515
Title: | Vertical flow constructed wetland as a green solution for low biodegradable and high nitrogen wastewater: A case study of explosives industry |
Authors: | Madeira, Luís Carvalho, Fátima Ribau Teixeira, Margarida Ribeiro, Carlos Almeida, Adelaide |
Keywords: | Explosives wastewater Vertical flow constructed wetland Flooding level Nitrogen and organic loads Vetiveria zizanioides |
Issue Date: | 2021 |
Publisher: | Elsevier |
Citation: | Madeira, L., Carvalho, F., Teixeira, M., Ribeiro, C. & Almeida, A. (2021). Vertical flow constructed wetland as a green solution for low biodegradable and high nitrogen wastewater: A case study of explosives industry. Chemosphere, 272, 1-10. https://doi.org/10.1016/j.chemosphere.2021.129871 |
Abstract: | The removal of nitrogen compounds from a pretreated explosives wastewater in vertical flow constructed wetland planted with Vetiveria zizanioides (0.24 m2 x 0.70 m), filled with light expanded clay aggregates (Leca®NR 10/20), was studied. Experiments under constant hydraulic load, 50 ± 4 Lm_2 d_1 and 83 ± 5 L m_2 d_1 without and with flooding level (25%), respectively, were made at different ammonium (3e 48 mg L_1 NH4+-N), nitrate (56 e160 mg NO3-N L_1) and nitrite (0.3e1.1 mg NO2-N L_1) concentrations. Results indicate that without flooding level (unsaturated) the removal efficiencies obtained were 30 ± 9, 7 ± 1 and 96 ± 2%, respectively to NH4+-N, NO3-N NO2-N. When using flooding level and an external carbon source (C/N ratio from 1.3 ± 0.19 to 2.5 ± 0.20), the organic matter (COD) removal efficiencies were above 90%, 75% for NH4+-N and 55% to NO3-N. Increasing the C/N ratio from 2.9 ± 0.21 to 4 ± 0.22 did not contributed to NH4+-N upgrade the efficiencies of COD, NH4+-N and NO3 -N removal. The denitrification process was occurred in aerobic conditions and nitrite production have ben occurred, probably due to the presence of aerobic conditions that inhibited partially denitrification. |
Peer reviewed: | yes |
URI: | https://hdl.handle.net/20.500.12207/5515 |
metadata.dc.identifier.doi: | https://doi.org/10.1016/j.chemosphere.2021.129871 |
ISSN: | 0045-6535 |
Publisher version: | http://www.journals.elsevier.com/chemosphere/ |
Appears in Collections: | D-TCA - Artigos em revistas indexadas à WoS/Scopus |
Files in This Item:
File | Description | Size | Format | |
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Vertical flow constructed wetland.pdf | 1.17 MB | Adobe PDF | View/Open |
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