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[{"key": "dc.contributor.advisor", "value": "Tuhkanen, Tuula", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Lindholm-Lehto, Petra", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Pettersson, Samu", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2020-06-29T11:59:07Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2020-06-29T11:59:07Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2020", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/70976", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Kiertovesiviljelyj\u00e4rjestelm\u00e4 (RAS) on kehitetty tuottamaan ravinnoksi hy\u00f6dynnett\u00e4vi\u00e4 vesieli\u00f6it\u00e4 nopeammin, joustavammin ja pienemm\u00e4ll\u00e4 ymp\u00e4rist\u00f6kuormalla kuin perinteisess\u00e4 vesiviljelyss\u00e4. Koska RAS:n tuloveden tarve on laskettu noin viiteen prosenttiin, j\u00e4rjestelm\u00e4ss\u00e4 oleva vesi on puhdistettava viljellyille lajeille laadultaan sopivaksi. Otsonia voidaan k\u00e4ytt\u00e4\u00e4 veden desinfiointi- ja k\u00e4sittelymenetelmist\u00e4, koska se voi mahdollisesti desinfioida ja parantaa veden laatua hapettamalla orgaanisia yhdisteit\u00e4. Koska veden laatu vaihtelee suuresti erilaisissa RAS-j\u00e4rjestelmiss\u00e4, vaadittava otsoniannos on m\u00e4\u00e4ritett\u00e4v\u00e4 huolellisesti, koska veteen liuennut otsoni on eritt\u00e4in myrkyllist\u00e4 vesieli\u00f6ille. Siksi j\u00e4\u00e4nn\u00f6sotsoni on joko tuhottava erillisell\u00e4 k\u00e4sittelyll\u00e4 tai annos s\u00e4\u00e4dett\u00e4v\u00e4 siten, ett\u00e4 vesi ei sis\u00e4ll\u00e4 en\u00e4\u00e4 otsonia, kun se saavuttaa kasvatusaltaan. T\u00e4m\u00e4n tutkimuksen tavoitteena oli selvitt\u00e4\u00e4 tehokkain otsoniannos Luke:n kokeelliselle RAS-alustalle Laukaassa. Otsonin hajoamisnopeus ja annos m\u00e4\u00e4ritettiin systeemin vedelle (TW) ja tulovedelle (LW) laboratorio-olosuhteissa. Otsonin vaikutusta DOC-, TN- ja pH-arvoihin tarkkailtiin. HPSEC-tekniikkaa k\u00e4ytettiin orgaanisten yhdisteiden hajoamisen seuraamiseen mittaamalla UV-254-absorbanssi ja tryptofaani-, tyrosiini-, humiini- ja fulvomainen fluoresenssi kuudelle erilaiselle veden sis\u00e4lt\u00e4m\u00e4lle molekyylikokofraktiolle. Tulokset osoittavat, ett\u00e4 tehokkain annos LW:lle olisi 1,07 mg O3 / mg DOC ja TW:lle 0,81 mg O3 / mg DOC, laskien veden kokonaisfluoresenssia ja -absorbanssia 78 \u00b1 8,7 % (LW) ja 77,3 \u00b1 13,3% (TW). Otsonin hajoaminen oli paljon nopeampaa TW:ss\u00e4 kuin LW:ss\u00e4 ja l\u00e4mp\u00f6tilan lasku n\u00e4ytti hidastavan prosessia.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Recirculating aquaculture system (RAS) has been developed to produce aquatic food species faster and more flexible and environmentally friendly way than traditional aquaculture. As the water consumption in RAS is reduced to 5 %, the water must be purified to be habitable for the cultured species. Ozone is one of the water disinfection and treatment methods and it can potentially, disinfect the water and improve water by oxidising organic compounds. As the water quality varies greatly in different RAS, the required ozone dose must be chosen carefully, because dissolved ozone is very toxic to aquatic organisms and very low concentrations does not achieve desired effect. Therefore, residual ozone must be either destroyed or dose adjusted so that no residual ozone is left in water when it reaches the culture tank. The aim of this study was to determine optimal ozone dose for the Luke\u2019s experimental RAS platform in Laukaa. Ozone decomposition and dose was determined for the tank water (TW) and inlet lake water (LW) in the laboratory conditions and the effect of ozone to dissolved organic carbon (DOC), total nitrogen (TN) and pH were monitored. HPSEC-technique was used to track the molecular distribution of organic compounds by measuring the UV-254 absorbance and tryptophan-, tyrosine-, humic- and fulvic-like fluorescence for six different molecular size fractions within the water. Results indicate, that the most optimal dose for the LW was 1,07 mg of O3/ mg of DOC and for TW 0,81 mg of O3 / mg of DOC as it decreased the total fluorescence and absorbance by 78,0 \u00b1 8,7 % (LW) and 77,3 \u00b1 13,3 % (TW). Ozone decomposition was much faster in TW than in LW and decreasing temperature seemed to slow the process down.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2020-06-29T11:59:07Z\r\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2020-06-29T11:59:07Z (GMT). No. of bitstreams: 0\r\n Previous issue date: 2020", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "96", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "absorbance", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "high performance size exclusion chromatography", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ozone decomposition", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "RAS", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "water quality parameters", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Effect of ozonation to water quality in recirculating aquaculture system", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202006295162", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Bio- ja ymp\u00e4rist\u00f6tieteiden laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Biological and Environmental Science", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Akvaattiset tieteet", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Aquatic sciences", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.collaborator", "value": "public", "language": "", "element": "contractresearch", "qualifier": "collaborator", "schema": "yvv"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "yvv.contractresearch.initiative", "value": "business", "language": "", "element": "contractresearch", "qualifier": "initiative", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", 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