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dc.contributor.authorAalto, Sanni
dc.contributor.authorSuurnäkki, Suvi
dc.contributor.authorvon Ahnen, Mathis
dc.contributor.authorSiljanen, Henri
dc.contributor.authorPedersen, Per Bovbjerg
dc.contributor.authorTiirola, Marja
dc.date.accessioned2020-06-03T13:13:04Z
dc.date.available2020-06-03T13:13:04Z
dc.date.issued2020
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/8145
dc.description.abstractWoodchip bioreactors are viable low-cost nitrate (NO3−) removal applications for treating agricultural and aquaculture discharges. The active microbial biofilms growing on woodchips are conducting nitrogen (N) removal, reducing NO3− while oxidizing the carbon (C) from woodchips. However, bioreactor age, and changes in the operating conditions or in the microbial community might affect the NO3− removal as well as potentially promote nitrous oxide (N2O) production through either incomplete denitrification or dissimilatory NO3− reduction to ammonium (DNRA). Here, we combined stable isotope approach, amplicon sequencing, and captured metagenomics for studying the potential NO3− removal rates, and the abundance and community composition of microbes involved in N transformation processes in the three different full-scale woodchip bioreactors treating recirculating aquaculture system (RAS) effluents. We confirmed denitrification producing di‑nitrogen gas (N2) to be the primary NO3− removal pathway, but found that 6% of NO3− could be released as N2O under high NO3− concentrations and low amounts of bioavailable C, whereas DNRA rates tend to increase with the C amount. The abundance of denitrifiers was equally high between the studied bioreactors, yet the potential NO3− removal rates were linked to the denitrifying community diversity. The same core proteobacterial groups were driving the denitrification, while Bacteroidetes dominated the DNRA carrying microbes in all the three bioreactors studied. Altogether, our results suggest that woodchip bioreactors have a high genetic potential for NO3− removal through a highly abundant and diverse denitrifying community, but that the rates and dynamics between the NO3− removal pathways depend on the other factors (e.g., bioreactor design, operating conditions, and the amount of bioavailable C in relation to the incoming NO3− concentrations).
dc.language.isoenglanti
dc.publisherElsevier BV
dc.relation.ispartofseriesScience of the total environment
dc.relation.urihttp://dx.doi.org/10.1016/j.scitotenv.2020.138093
dc.rightsCC BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectdenitrification
dc.subjectDNRA
dc.subjectnitrogen removal
dc.subjectnitrous oxide
dc.subjectrecirculation aquaculture systems
dc.titleNitrate removal microbiology in woodchip bioreactors: A case-study with full-scale bioreactors treating aquaculture effluents
dc.description.versionfinal draft
dc.contributor.departmentYmpäristö- ja biotieteiden laitos / Toiminta
uef.solecris.id69615269en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© 2020 Elsevier B.V.
dc.relation.doi10.1016/j.scitotenv.2020.138093
dc.description.reviewstatuspeerReviewed
dc.format.pagerange138093
dc.publisher.countryAlankomaat
dc.relation.issn0048-9697
dc.relation.volume723
dc.rights.accesslevelopenAccess
dc.type.okmA1
uef.solecris.openaccessEi


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