Nitrogen removal in vertical flow constructed wetlands: influence of bed depth and high nitrogen loadings
| Autor: | Karolina Kurek, Anabela Durão, Carlos Ribeiro, Krzysztof Jóźwiakowski, Fátima Carvalho, Piotr Bugajski, Alina Kowalczyk-Juśko, Magdalena Gajewska, Adelaide Almeida |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Morphology (linguistics)
Nitrogen 0208 environmental biotechnology Wetland Soil science 02 engineering and technology Vetiveria zizanioides 010501 environmental sciences Wastewater 01 natural sciences Nitrogen removal Waste Disposal Fluid High nitrogen Vertical flow Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology geography geography.geographical_feature_category Subsurface vertical flow bed Ammonium nitrogen mass load General Medicine 020801 environmental engineering Ammonium toxicity Bed depth Wetlands Denitrification Environmental science |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) Agência para a Sociedade do Conhecimento (UMIC)-FCT-Sociedade da Informação instacron:RCAAP |
| Popis: | The aim of the study was to evaluate the nitrogen removal and its effects on the plant’s growth and leaves morphology. using two subsurface vertical flow (VF bed), with different depths (0.24 m2 × 0.70 m; 0.24 m2 × 0.35 m) and nitrogen load increments. The VF bed were planted with Vetiveria zizanioides, filled with light expanded clay aggregates (Leca®NR 10/20) and fed in parallel mode with synthetic wastewater. High ammonium nitrogen concentration ([NH4 +–N] from 68 ± 3 to 290 ± 8 mg L−1) was used without toxicity symptoms in plants, although the effects of ammonium nitrogen load were stopped the growth of the plants. Significant differences between ammonium nitrogen removed in each VF bed obtained for total nitrogen (TNinfl.) ≥ 27 ± 0.8 g m−2 d−1. The nitrification was contributed to ammonium nitrogen removal because was found higher values of nitrate and nitrite in the effluent. These values were more higher in VF bed 1 than in the VF bed 2, since ammonium nitrogen removal were also more higher in VF bed 1 than in the VF bed 2. Total nitrogen mass balance was carried out and the results show that the nitrification/denitrification process occurred with nitrogen plants uptake. It was observed that the VF bed depth has an influence on all nitrogen removal processes. As higher the depth root system it is seemed to favour the creation of zones with different oxidations conditions that allow the nitrogen compounds to be removed intensively. |
| Databáze: | OpenAIRE |
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