Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions

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dc.contributor.author Kiani, Sepideh
dc.contributor.author Lehosmaa, Kaisa
dc.contributor.author Kløve, Bjørn
dc.contributor.author Ronkanen, Anna-Kaisa
dc.date.accessioned 2022-05-05T10:53:58Z
dc.date.available 2022-05-05T10:53:58Z
dc.date.issued 2022
dc.identifier.citation 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
dc.identifier.uri http://hdl.handle.net/10138/343349
dc.description.abstract 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.
dc.language.iso en
dc.publisher Elsevier BV
dc.relation.ispartofseries Ecological Engineering
dc.rights CC BY 4.0
dc.subject vesiensuojelu
dc.subject typpi
dc.subject poistaminen
dc.subject kaivosvesi
dc.subject hydrauliset ominaisuudet
dc.subject menetelmät
dc.subject hake
dc.subject bioreaktorit
dc.subject sammalet
dc.subject nevasirppisammal
dc.subject Warnstorfia fluitans
dc.subject denitrification
dc.subject hydraulic properties
dc.subject passive treatment
dc.subject woodchip
dc.subject plant uptake
dc.subject phytoremediation
dc.title Nitrogen removal of mine-influenced water in a hybrid bioreactor with floating hook-moss (Warnstorfia fluitans) in cold climate conditions
dc.format.volume 177
dc.identifier.urn URN:NBN:fi-fe2022050533204
dc.contributor.organization Suomen ympäristökeskus fi
dc.contributor.organization The Finnish Environment Institute en
dc.format.pagerange 106562
dc.relation.doi https://doi.org/10.1016/j.ecoleng.2022.106562
dc.relation.issn 0925-8574
dc.type.okm A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.type.okm A1 Journal article (refereed), original research en

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