Title Učinkovitost denitrifikacije u morskom recirkulacijskom akvakulturnom sustavu
Title (english) Denitrification efficiency in a marine recirculating aquaculture system
Author Marina Brailo Šćepanović
Mentor Jurica Jug-Dujaković (mentor) MBZ: 25643
Committee member Ivan Katavić (predsjednik povjerenstva)
Committee member Tibela Landeka Dragičević (član povjerenstva)
Committee member Boško Skaramuca (član povjerenstva)
Granter University of Split Split
Defense date and country 2016-06-28, Croatia
Scientific / art field, discipline and subdiscipline NATURAL SCIENCES Interdisciplinary Natural Sciences
Universal decimal classification (UDC ) 638/639 - Apiculture. Keeping, breeding and management of insects and other arthropods. Hunting. Fishing. Fish breeding
Abstract U ovoj disertaciji istraživana je u činkovitost denitrifikacije u morskom recirkulacijskom akvakulturnom sustavu. Denitrifikacija je proučavana u dva bioreaktora ispunjena pergolarom (cijevnom polietilenskom mrežom) kao nosa čem denitrifikacijskih bakterija, kao izvor ugljika korištena je sladovina, a pra ćene su promjene relevantnih pokazatelja kvalitete vode; saliniteta, temperature, pH i koncentracija otopljenog kisika, nitratnog, nitritnog i amonijakalnog dušika . Pergolar se pokazao dobrom podlogom za naseljavanje bakterija, a sladovina dobrim izvorom ugljika za denitrifikaciju. Faza indukcije denitrifikacijskih biofiltara trajala je 287 dana. Denitrifikacija je bila najučinkovitija u stacionarnim uvjetima kad je brzina uklanjanja nitratnog dušika iznosila 40 mg/Ld, ili izraženo prema površini pergolara 121 mg/m2d, a prema njegovu volumenu 485 mg/Ld. Faza indukcije rotacijskog biološkog kontaktora kao nitrifikacijskog biofiltra trajala je 160 dana, a postignuta je brzina uklanjanja ukupnoga amonijakalnog dušika od 40 mg/Ld. Filogeneti čka analiza mikrobnih populacija u recirkulacijskom akvakulturnom sustavu sekvenciranjem sljedeće generacije pokazala je da je u nitrifikacijskom biofiltru bio znatan broj bakterija što provode oksidaciju am onijaka i nitrita, dok je u denitrifikacijskim bioreaktorima bio velik udio bakterija što provode heterotrofnu i autotrofnu denitrifikaciju, a bilo je i onih što sudjeluju u kruženju sumpora. Razvijena je stab ilna nitrifikacijska populacija sposobna ukloniti amonijak koji bi nastao uzgojem ribe u realnim proizvodnim uvjetima, kao i stabilna denitrifikacijska populacija sposobna ukloniti nitrat koji bi nastao nakon nitrifikacije.
Abstract (english) This dissertation studies the efficiency of denitrification in marine recirculating aquaculture system. Denitrification was studied in two bioreactors filled with pergolar (polyethylene pipe net) as the carrier for denitrification bacteria, wort was used as a carbon source, and relevant indicators of water quality were monitored; salinity, temperature, pH as well as concentrations of dissolved oxygen, nitrate, nitrite and ammonia. Pergolar proved to be a good carrier for settling of bacteria and wort proved to be a good carbon source for denitrification. Start-up phase of denitrification biofilters lasted 287 days. Denitrification was most effective in stationary conditions when the removal rate of nitrate nitrogen was 40 mg/Ld, or expressed by the surface of pergolar 121 mg/m2d, and by its volume 485 mg/Ld. Start-up phase of rotating biological contactor that served as nitrification biofilter lasted 160 days and ammonia removal rate of 40 mg/Ld was achieved. Phylogenetic analysis of microbial populations in recirculating aquaculture system by next generation sequencing showed that there was a significant number of bacteria that oxidize ammonia and nitrite in the nitrification biofilter, while in denitrification bioreactors there was a large proportion of bacteria that carry out heterotrophic and autotrophic denitrification, as well as those that participate in sulfur cycling. A stable nitrification population able to remove ammonia that would arise form fish farming in real production conditions was developed, as well as the stable denitrification population able to remove nitrate that would result after nitrification.
Keywords
denitrifikacija
filogenetička analiza
nitrifikacija
morski recirkulacijski akvakulturni sustav
pergolar
sekvenciranje sljedeće generacije
sladovina
Keywords (english)
denitrification
marine aquaculture recirculation system
next generation sequencing
nitrification
pergolar
phylogenetic analysis
wort
Language croatian
URN:NBN urn:nbn:hr:226:465103
Study programme Title: Applied Marine Sciences Study programme type: university Study level: postgraduate Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje interdisciplinarne prirodne znanosti (doktor/doktorica znanosti, područje prirodnih znanosti, polje interdisciplinarne prirodne znanosti)
Type of resource Text
Extent XXVI, 123 str. ; 30 cm
File origin Born digital
Access conditions Open access
Terms of use
Repository Repository of University Department of Marine Studies
Created on 2018-05-14 07:49:10