Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions
To remove nitrogen in cold conditions, we studied new nature-based treatment solutions using six pilot-scale reactors. The pilots were woodchip bioreactor (WBR), aquatic floating hook-moss (Warnstorfia fluitans) (MBR), and a combined woodchip and floating hook-moss hybrid unit (HBR) with an improved...
Published in: | Ecological Engineering |
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Language: | English |
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Elsevier BV
2022
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Online Access: | http://hdl.handle.net/10138/343349 |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/343349 2023-08-20T04:08:44+02:00 Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions Kiani, Sepideh Lehosmaa, Kaisa Kløve, Bjørn Ronkanen, Anna-Kaisa Suomen ympäristökeskus The Finnish Environment Institute 2022-05-05T10:53:58Z application/pdf http://hdl.handle.net/10138/343349 eng eng Elsevier BV 106562 10.1016/j.ecoleng.2022.106562 Ecological Engineering 0925-8574 177 Sepideh Kiani, Kaisa Lehosmaa, Bjørn Kløve, Anna-Kaisa Ronkanen. Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions. Ecological Engineering 177 (2022), 106562, ISSN 0925-8574. https://doi.org/10.1016/j.ecoleng.2022.106562 http://hdl.handle.net/10138/343349 URN:NBN:fi-fe2022050533204 CC BY 4.0 openAccess vesiensuojelu typpi poistaminen kaivosvesi hydrauliset ominaisuudet menetelmät hake bioreaktorit sammalet nevasirppisammal Warnstorfia fluitans A1 Journal article (refereed), original research A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä 2022 ftunivhelsihelda https://doi.org/10.1016/j.ecoleng.2022.106562 2023-07-28T06:15:40Z To remove nitrogen in cold conditions, we studied new nature-based treatment solutions using six pilot-scale reactors. The pilots were woodchip bioreactor (WBR), aquatic floating hook-moss (Warnstorfia fluitans) (MBR), and a combined woodchip and floating hook-moss hybrid unit (HBR) with an improved hydraulic design. The experiment was run in a climate room at temperatures of 10 °C and 5 °C and using mine water from two sites located in northern Finland. Unlike traditional horizontal flow woodchip bioreactors, in this study the hydraulic efficiency was improved from poor (λ = 0.06) in the woodchip bioreactor to satisfactory (λ = 0.51) in the hybrid unit by inserting two inner plates along the water flow and adding floating hook-moss. The hybrid bioreactor revealed the highest capability of nitrogen removal in all inorganic forms at T ≤ 10 °C with a mean HRT of 70.5 h. On average, 30–78 % of dissolved inorganic nitrogen was removed in the hybrid unit, which was 2 and 3 times more than in units consisting only of woodchip or floating hook-moss. The hybrid bioreactor revealed a maximum NO−3-N removal rate of 1.0–5.2 g m−3 d−1 and a 21.8–99.7 % removal efficiency for an average incoming NO−3-N load of 40 g d−1. The maximum NH+4-N removal efficiency of 75.6 and 53 % took place in HBR and MBR, respectively, when the incoming NH+4-N load was 23.6 ± 0.7 g d−1 at 10 °C. Over the 154 days of the experiment, the hybrid unit removed a total of 2.95 kg DIN-N, which was 0.8 kg higher than the sum of the DIN-N mass removed in the individual woodchip (1.7 kg) and moss units (0.55 kg). The nitrogen content of the aquatic moss was higher in the hybrid unit compared to the moss unit, showing a higher contribution of N plant uptake. Overall, our results suggest that combining woodchips and aquatic moss in a hybrid unit with improved hydraulic efficiency using inner walls may enhance nitrogen removal in cold climate conditions. Article in Journal/Newspaper Northern Finland Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Hake ENVELOPE(15.612,15.612,66.797,66.797) Ecological Engineering 177 106562 |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
vesiensuojelu typpi poistaminen kaivosvesi hydrauliset ominaisuudet menetelmät hake bioreaktorit sammalet nevasirppisammal Warnstorfia fluitans |
spellingShingle |
vesiensuojelu typpi poistaminen kaivosvesi hydrauliset ominaisuudet menetelmät hake bioreaktorit sammalet nevasirppisammal Warnstorfia fluitans Kiani, Sepideh Lehosmaa, Kaisa Kløve, Bjørn Ronkanen, Anna-Kaisa Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions |
topic_facet |
vesiensuojelu typpi poistaminen kaivosvesi hydrauliset ominaisuudet menetelmät hake bioreaktorit sammalet nevasirppisammal Warnstorfia fluitans |
description |
To remove nitrogen in cold conditions, we studied new nature-based treatment solutions using six pilot-scale reactors. The pilots were woodchip bioreactor (WBR), aquatic floating hook-moss (Warnstorfia fluitans) (MBR), and a combined woodchip and floating hook-moss hybrid unit (HBR) with an improved hydraulic design. The experiment was run in a climate room at temperatures of 10 °C and 5 °C and using mine water from two sites located in northern Finland. Unlike traditional horizontal flow woodchip bioreactors, in this study the hydraulic efficiency was improved from poor (λ = 0.06) in the woodchip bioreactor to satisfactory (λ = 0.51) in the hybrid unit by inserting two inner plates along the water flow and adding floating hook-moss. The hybrid bioreactor revealed the highest capability of nitrogen removal in all inorganic forms at T ≤ 10 °C with a mean HRT of 70.5 h. On average, 30–78 % of dissolved inorganic nitrogen was removed in the hybrid unit, which was 2 and 3 times more than in units consisting only of woodchip or floating hook-moss. The hybrid bioreactor revealed a maximum NO−3-N removal rate of 1.0–5.2 g m−3 d−1 and a 21.8–99.7 % removal efficiency for an average incoming NO−3-N load of 40 g d−1. The maximum NH+4-N removal efficiency of 75.6 and 53 % took place in HBR and MBR, respectively, when the incoming NH+4-N load was 23.6 ± 0.7 g d−1 at 10 °C. Over the 154 days of the experiment, the hybrid unit removed a total of 2.95 kg DIN-N, which was 0.8 kg higher than the sum of the DIN-N mass removed in the individual woodchip (1.7 kg) and moss units (0.55 kg). The nitrogen content of the aquatic moss was higher in the hybrid unit compared to the moss unit, showing a higher contribution of N plant uptake. Overall, our results suggest that combining woodchips and aquatic moss in a hybrid unit with improved hydraulic efficiency using inner walls may enhance nitrogen removal in cold climate conditions. |
author2 |
Suomen ympäristökeskus The Finnish Environment Institute |
format |
Article in Journal/Newspaper |
author |
Kiani, Sepideh Lehosmaa, Kaisa Kløve, Bjørn Ronkanen, Anna-Kaisa |
author_facet |
Kiani, Sepideh Lehosmaa, Kaisa Kløve, Bjørn Ronkanen, Anna-Kaisa |
author_sort |
Kiani, Sepideh |
title |
Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions |
title_short |
Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions |
title_full |
Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions |
title_fullStr |
Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions |
title_full_unstemmed |
Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions |
title_sort |
nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (warnstorfia fluitans) in cold climate conditions |
publisher |
Elsevier BV |
publishDate |
2022 |
url |
http://hdl.handle.net/10138/343349 |
long_lat |
ENVELOPE(15.612,15.612,66.797,66.797) |
geographic |
Hake |
geographic_facet |
Hake |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_relation |
106562 10.1016/j.ecoleng.2022.106562 Ecological Engineering 0925-8574 177 Sepideh Kiani, Kaisa Lehosmaa, Bjørn Kløve, Anna-Kaisa Ronkanen. Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions. Ecological Engineering 177 (2022), 106562, ISSN 0925-8574. https://doi.org/10.1016/j.ecoleng.2022.106562 http://hdl.handle.net/10138/343349 URN:NBN:fi-fe2022050533204 |
op_rights |
CC BY 4.0 openAccess |
op_doi |
https://doi.org/10.1016/j.ecoleng.2022.106562 |
container_title |
Ecological Engineering |
container_volume |
177 |
container_start_page |
106562 |
_version_ |
1774721196846219264 |