Parcijalna nitrifikacija

undergraduate thesis

• Title (english): Partial nitrification
• Author: Nikola Maričić
• Mentor: Tibela Landeka Dragičević (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); (Laboratory for the Biological Waste Water Treatment); Zagreb
• Defense date and country: 2013-05-28, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology

Abstract

Iz otpadnih voda nužno je ukloniti sastojke s dušikom jer su toksični za vodeni svijet, mogu izazvati pojavu smanjenja koncentracije otopljenog kisika i eutrofikaciju u recipijentima. Biološka nitrifikacija i denitrifikacija su najčešće korišten postupak za uklanjanje dušika iz otpadnih voda. Nitrifikacija je autotrofna oksidacija amonijaka (NH4-N), prvo do nitrita (NO2-N), a zatim do nitrata (NO3-N), dok denitrifikacija predstavlja heterotrofnu anoksičnu pretvorbu nitrata (NO3-N) prvo u nitite (NO2-N) a zatim u plinoviti dušik. U oba procesa, nitrifikaciji i denitrifikaciji, nitrit (NO2-N) je međuprodukt. Proces uklanjanja dušika putem nitrita, je isplativ i održiv biološki proces uklanjanja nutrijenata. Taj proces, u usporedbi s tradicionalnim biološkim procesom uklanjanja nutrijenata, rezultira u uštedi do 25% potrošnje kisika za proces nitrifikacije, te 40% izvora ugljika za denitrifikaciju. Čimbenici koji se navode u literaturi za postizanje stabilne parcijalne nitrifikacije su: niska koncentracija otopljenog kisika, visoka temperatura, odgovarajuće vrijeme zadržavanja mulja, visoka koncentracija supstrata, te inhibirajući čimbenici slobodni amonijak i nitritna kiselina.

Abstract (english)

It is an important issue to remove nitrogen components from wastewater nowadays since these components can be toxic to aquatic life, and cause oxygen depletion and eutrophication in receiving water. Biological nitrification and denitrification is the most commonly used process for nitrogen removal from wastewater. Nitrification is the autotrophic oxidation of NH4-N, first to NO2-N and then, to NO3-N, whereas denitrification is the heterotrophic and anoxic conversion of NO3-N, first to NO2-N and then, to gaseous nitrogen compounds. In both, nitrification and denitrification process, nitrite (NO2-N) is an intermediate. Shortcut nitrogen removal via nitrite pathway, as one of the cost-effective and sustainable biological nutrient removal process. This process, compared with the traditional biological nutrient removal process, results in saving up to 25% of oxygen consumption in the nitrification stage, and 40% of the carbon source requirements in the denitrification stage. Factors to achieve stable partial nitrification, in literature include: low dissolved oxygen concentration, high temperature, appropriate sludge retention time, high substate concentation, free ammonia and free nitrous acid inhibition.

• Keywords: amonijak oksidirajuće bakterije; čimbenici procesa parcijalne nitrifikacije; nitritacija; nitrit oksidirajuće bakterije; nitratacija
• Keywords (english): ammonium oxidizing bacteria; process parameters; nitritation; nitrit oxidizing bacteria; nitratation
• Language: croatian
• URN:NBN: urn:nbn:hr:159:695570
• Study programme: Title: Food Technology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka prehrambene tehnologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka prehrambene tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-05-03 10:40:58