Vertical flow constructed wetland as a green solution for low biodegradable and high nitrogen wastewater: A case study of explosives industry
| Autor: | Luís Madeira, Carlos Ribeiro, Adelaide Almeida, Margarida Ribau Teixeira, Fátima Carvalho |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Denitrification Nitrogen Health Toxicology and Mutagenesis 0208 environmental biotechnology Nitrogen Dioxide chemistry.chemical_element Explosives wastewater Environmental Sciences & Ecology 02 engineering and technology Vetiveria zizanioides 010501 environmental sciences Wastewater 01 natural sciences Vertical flow constructed wetland chemistry.chemical_compound Nitrate Explosive Agents Environmental Chemistry Organic matter Ammonium Nitrite Nitrites 0105 earth and related environmental sciences chemistry.chemical_classification Nitrogen and organic loads Public Health Environmental and Occupational Health General Medicine General Chemistry Pollution 020801 environmental engineering chemistry Environmental chemistry Wetlands Constructed wetland Flooding level |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | The removal of nitrogen compounds from a pretreated explosives wastewater in vertical flow constructed wetland planted with Vetiveria zizanioides (0.24 m(2) x 0.70 m), filled with light expanded clay aggregates (Leca (R) 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 (3-48 mg NH4+-N L-1), nitrate (56-160 mg NO3--N L-1) and nitrite (0.3-1.1 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 and 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 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. (C) 2021 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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