Nitrogen removal in vertical flow constructed wetlands: influence of bed depth and high nitrogen loadings

Adelaide Almeida , Krzysztof Jóźwiakowski , Alina Kowalczyk-Juśko , Piotr Bugajski , Karolina Kurek , Fátima Carvalho , Anabela Durao , Carlos Ribeiro , Magdalena Gajewska


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.
Author Adelaide Almeida - Polytechnic Institute of Beja
Adelaide Almeida,,
, Krzysztof Jóźwiakowski - University of Life Sciences in Lublin
Krzysztof Jóźwiakowski,,
, Alina Kowalczyk-Juśko - University of Life Sciences in Lublin
Alina Kowalczyk-Juśko,,
, Piotr Bugajski (FoEEaLS / DoSEaWM)
Piotr Bugajski,,
- Department of Sanitary Engineering and Water Management
, Karolina Kurek (FoEEaLS / DoSEaWM)
Karolina Kurek,,
- Department of Sanitary Engineering and Water Management
, Fátima Carvalho - Polytechnic Institute of Beja
Fátima Carvalho,,
, Anabela Durao - Polytechnic Institute of Beja
Anabela Durao,,
, Carlos Ribeiro - Polytechnic Institute of Beja
Carlos Ribeiro,,
, Magdalena Gajewska - Gdańsk University of Technology (PG)
Magdalena Gajewska,,
Journal seriesEnvironmental Technology, [Environmental Technology (United Kingdom)], ISSN 0959-3330, e-ISSN 1479-487X, (N/A 70 pkt)
Issue year2020
Publication size in sheets0.7
Keywords in EnglishAmmonium nitrogen mass load, ammonium toxicity, bed depth, subsurface vertical flow bed, Vetiveria zizanioides
ASJC Classification2700 General Medicine; 2304 Environmental Chemistry; 2311 Waste Management and Disposal; 2312 Water Science and Technology
Languageen angielski
LicenseJournal (articles only); author's original; Uznanie Autorstwa (CC-BY); after publication
Nitrogen removal in vertical flow constructed wetlands: influence of bed depth and high nitrogen loadings of 22-06-2020
2,95 MB
Score (nominal)70
Score sourcejournalList
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 0.648; WoS Impact Factor: 2018 = 1.918 (2) - 2018=1.848 (5)
Citation count*2 (2020-08-14)
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