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dc.contributor.authorKujala, Kukka
dc.contributor.authorPulkkinen, Jani
dc.contributor.authorVielma, Jouni
dc.date.accessioned2020-05-26T10:03:34Z
dc.date.available2020-05-26T10:03:34Z
dc.date.issued2020
dc.identifier.citationKujala, K., Pulkkinen, J., & Vielma, J. (2020). Discharge management in fresh and brackish water RAS : Combined phosphorus removal by organic flocculants and nitrogen removal in woodchip reactors. <i>Aquacultural Engineering</i>, <i>90</i>, Article 102095. <a href="https://doi.org/10.1016/j.aquaeng.2020.102095" target="_blank">https://doi.org/10.1016/j.aquaeng.2020.102095</a>
dc.identifier.otherCONVID_35696286
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/69229
dc.description.abstractThe current study combined P and N removal using organic flocculant chemicals and woodchip bioreactors in both freshwater and brackish water (7 ppm) recirculating aquaculture systems (RAS). The use of carbon (C) containing flocculant chemicals in the process was hypothesized to further stimulate C-demanding N removal (denitrification) in bioreactors. The trial of combined P and N removal consisted of four treatments: freshwater and brackish water RAS with and without the addition of supernatant from flocculation process to the woodchip reactor. Duplicate woodchip reactors were used per treatment and the trial was run for six weeks. 56 % and 49 % of P was removed from fresh and brackish sludge water, respectively. The nitrate-N (NO3-N) removal rate was improved in the treatment when supernatant from flocculation process was used together with RAS discharge water when compared against the control. In brackish water RAS, the improvement was more pronounced (from 6.6 to 16.5 g NO3-N m-3 d-1) than in freshwater RAS (from 5.1 to 6.5 NO3-N m-3 d-1). In the freshwater bioreactors using supernatant, N was largely discharged as a nitrite-N (NO2-N). High NO2-N concentrations in freshwater reactors allude to incomplete denitrification reactions taking place. The results suggest that the organic flocculants did provide an additional C source for denitrification, which improved the N-removal process. However, in freshwater RAS this might have been partly due to untargeted processes such as DNRA (dissimilatory nitrate reduction to ammonium), and/or insufficient denitrification reactions taking place (excessive NO2-N production).en
dc.format.mimetypeapplication/pdf
dc.languageeng
dc.language.isoeng
dc.publisherElsevier
dc.relation.ispartofseriesAquacultural Engineering
dc.rightsCC BY-NC-ND 4.0
dc.subject.otherwoodchip bioreactor
dc.subject.otherrecirculating aquaculture
dc.subject.otherwastewater
dc.subject.otherflocculation
dc.titleDischarge management in fresh and brackish water RAS : Combined phosphorus removal by organic flocculants and nitrogen removal in woodchip reactors
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202005263481
dc.contributor.laitosBio- ja ympäristötieteiden laitosfi
dc.contributor.laitosDepartment of Biological and Environmental Scienceen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.type.coarhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.description.reviewstatuspeerReviewed
dc.relation.issn0144-8609
dc.relation.volume90
dc.type.versionacceptedVersion
dc.rights.copyright© 2020 Elsevier BV
dc.rights.accesslevelopenAccessfi
dc.subject.ysovesiviljely (kalatalous)
dc.subject.ysojätevesi
dc.subject.ysojäteveden käsittely
dc.subject.ysobioreaktorit
dc.subject.ysodenitrifikaatio
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p5099
jyx.subject.urihttp://www.yso.fi/onto/yso/p5794
jyx.subject.urihttp://www.yso.fi/onto/yso/p17761
jyx.subject.urihttp://www.yso.fi/onto/yso/p37822
jyx.subject.urihttp://www.yso.fi/onto/yso/p12487
dc.rights.urlhttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.relation.doi10.1016/j.aquaeng.2020.102095
jyx.fundinginformationThis work resulted from the BONUS CLEANAQ project and was supported by BONUS (Art 185), funded jointly by the EU and national funding institutions of Finland (Academy of Finland), Sweden (Vinnova) and Denmark (Innovation Fund Denmark IFD).
dc.type.okmA1


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