Denitrifikacija sintetske otpadne vode s visokom koncentracijom nitrata

master's thesis

• Title (english): Denitrification of synthetic wastewater with high nitrate concentration
• Author: Marina Ugrina
• Mentor: Dijana Grgas (mentor)
• Committee member: Tibela Landeka Dragičević (predsjednik povjerenstva)
• Committee member: Davor Valinger (član povjerenstva)
• Committee member: Ana Jurinjak Tušek (član povjerenstva)
• 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: 2022-09-21, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

U ovom radu istražena je denitrifikacija sintetske otpadne vode s visokom koncentracijom nitrata 250±5 mg NO₃-N/L pri omjerima C/N 1, 2 i 3 uz natrijev acetat kao izvor ugljika. Omjeri C/N 1 i 2 nisu bili dovoljni za potpunu denitrifikaciju, pri čemu je postignuto 26,2 % i 78,7 % smanjenje koncentracije NO3-N. Također, pri omjerima C/N 1 i 2, nakon utroška acetata, s unutarstaničnim rezervama je postignuta sveukupno 40,9 % i 91,2 % redukcija nitrata. Pri omjeru C/N 3 ostvareno je 99,2 %... More smanjenje koncentracije nitrata. Ostvarene brzine denitrifikacije su iznosile 33 mg NO₃-N/Lh, 32,7 mg NO₃-N/Lh i 33,6 mg NO₃-N/Lh pri omjerima C/N 1, 2 i 3, a pri omjerima C/N 1 i 2 brzine denitrifikacije s unutstastaničnim zalihama su iznosle 6,7 mg NO₃-N/Lh i 20,7 mg NO₃-N/Lh. Nitrit, iako se nakupljao pri sva tri omjera, nije se pokazao kao limitirajući faktor jer su mikroorganizmi aktivnog mulja bili aklimatizirani na visoke koncentracije nitrita. Less

Abstract (english)

In this paper the denitrification of synthetic wastewater with high nitrate concentration of 250±5 mg NO₃-N/L at C/N ratios of 1, 2 and 3 with sodium acetate as a carbon source was investigated. C/N ratios 1 and 2 were not sufficient for complete denitrification, whereby 26.2 % and 78.7 % reduction in NO₃-N concentration was achieved. Also, at C/N ratios 1 and 2, after acetate consumption, a total of 40.9 % and 91.2 % nitrate reduction was achieved with intracellular reserves. At the... More C/N ratio of 3, a 99.2 % reduction in nitrate concentration was achieved. The achieved denitrification rates were 33 mg NO₃-N/Lh, 32.7 mg NO₃-N/Lh and 33.6 mg NO₃-N/Lh at C/N ratios 1, 2 and 3, and at C/N ratios 1 and 2 denitrification rates with intracellular reserves were 6.7 mg NO₃-N/Lh and 20.7 mg NO₃-N/Lh. Although nitrite accumulated at all three ratios, it did not prove to be a limiting factor because the microorganisms in the activated sludge were acclimatized to high concentrations of nitrite. Less

• Keywords: denitrifikacija; visoka koncentracija nitrata; C/N omjer; otpadna voda; izvor ugljika
• Keywords (english): denitrification; high nitrate concentration; C/N ratio; wastewater; carbon source
• Language: croatian
• URN:NBN: urn:nbn:hr:159:217813
• Study programme: Title: Bioprocess Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka bioprocesnog inženjerstva (magistar/magistra inženjer/inženjerka bioprocesnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-02-13 13:19:42