1. Effect of low-density static magnetic field on the oxidation of ammonium by Nitrosomonas europaea and by activated sludge in municipal wastewaterJasmina Filipič, Barbara Kraigher, Brigita Tepuš, Vanja Kokol, Ines Mandić-Mulec, 2015, original scientific article Abstract: Ammonium removal is a key step in biological wastewater treatment and novel approaches that improve this process are in great demand. The aim of this study is to test the hypothesis that ammonium removal from wastewater can be stimulated by static magnetic fields. This was achieved by analysis of the effects of static magnetic field (SMF) on the growth and activity of Nitrosomonas europaea, a key ammonia-oxidising bacterium, where increased growth and increased ammonia oxidation rate were detected when bacteria were exposed to SMF at 17 mT. Additionally, the effect of SMF on mixed cultures of ammonia oxidisers in activated sludge, incubated in sequencing batch bioreactors simulating wastewater treatment process, was assessed. SMFs of 30 and 50 mT, but not of 10 mT, increased ammonium oxidation rate in municipal wastewater by up to 77 % and stimulated ammonia oxidiser growth. The results demonstrate the potential for use of static magnetic fields in increasing ammonium removal rates in biological wastewater treatment plants.
Keywords: odpadne vode, bakterije, Nitrosomonas europaea, statično magnetno polje, biološke čistilne naprave, nitrifikacija
Published in DKUM: 24.07.2017; Views: 1171; Downloads: 362
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2. Denitrification of spent regenerated brine using molassesBrigita Tepuš, Marjana Simonič, Aleksandra Petrovič, Jasmina Filipič, 2014, original scientific article Abstract: Spent BRINE from the regeneration of exhausted resins has to be properly treated before its disposal. The heterotrophic denitrification of regenerated brine was studied in present work. Molasses which served as a carbon source has until now not been applied during brine denitrification. The nitrate and nitrite consumptions were observed according to different ratios between total organic carbon and nitrate (TOC / NO3 ratios) and the influence of NaCl was studied during batch experiments. This work ascertained that molasses is a very good source of carbon, and no addition of other nutrients is necessary. The complete nitrate removal from regenerated brine could be achieved using molasses.
Keywords: nitrate, denitrification, regeneration brine, molasses, kinetics
Published in DKUM: 05.07.2017; Views: 1326; Downloads: 419
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3. VPLIV MAGNETNEGA POLJA NA BAKTERIJE V BIOLOŠKIH ČISTILNIH NAPRAVAH IN NA PRETVORBO DUŠIKAJasmina Filipič, 2013, dissertation Abstract: V doktorski disertaciji predstavljamo študijo čiščenja odpadne vode z vidika odstranjevanja dušikovih spojin s pomočjo srednje močnega statičnega magnetnega polja (SMP). Veljavna zakonodaja in visoki stroški okoljskih dajatev za onesnaževanje voda, namreč težijo k iskanju novih naprednih tehnologij čiščenja odpadne vode. V dosedanjih raziskavah je bilo ugotovljeno, da se pod vplivom SMP, poveča odstranjevanje organskih substratov iz odpadne vode. Naše raziskave kažejo, da SMP gostote, B = (30, 50) mT (toda ne B = 10 mT) pozitivno vpliva na odstranjevanje dušikovih spojin v SBR reaktorjih. Amonij-oksidacijska hitrost se pri SMP gostote, B = 50 mT drastično poveča, in sicer za w = 85 ± 5 %. Glede na pozitiven učinek SMP na čiščenje odpadne vode, smo v nadaljevanju raziskave preučili vpliv SMP na tri bakterije odpadne vode ˗ Nitrosomonas europaea, Escherichia coli in Pseudomonas putida. Rezultati raziskave kažejo, da SMP (B = 17 mT) negativno vpliva na rast bakterij E.coli in P.putida, toda pozitivno na dehidrogenazno aktivnost in koncentracijo znotrajceličnega ATP. Inhibitorni vpliv na omenjeni bakteriji je bil največji pri njunih optimalnih temperaturah rasti. V okviru doktorske naloge smo kot prvi dokazali, da SMP (B = 17 mT) pozitivno vpliva na oksidacijo amonijevega dušika pri bakteriji N.europaea. SMP prav tako pozitivno vpliva na mešano združbo amonij-oksidirajočih bakterij v odpadni vodi, s povečanjem za w = 40 % pod vplivom SMP in na čisto kulturo N.europaea s povečanjem števila bakterij po sedmih dneh izpostavitve SMP za w = 60 %, v primerjavi s kontrolnimi vzorci.
Iz rezultatov je razvidno, da lahko z ustrezno gostoto SMP, časom izpostavitve in temperaturo znatno povečamo odstranjevanje dušikovih spojin iz odpadne vode ter pospešimo rast enega izmed najpomembnejših nitrifikatorjev odpadne vode – Nitrosomonas europaea.
Keywords: odpadna voda, bakterije, statično magnetno polje, dušikove spojine, nitrifikacija, denitrifikacija
Published in DKUM: 04.06.2013; Views: 2619; Downloads: 282
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4. ANALIZA VPLIVA VSEBNOSTI VITAMINA C NA KVALITETO MOKEJasmina Filipič, 2009, undergraduate thesis Abstract: V diplomskem delu opisujemo eksperimentalni postopek določanja vpliva vsebnosti vitamina C na kvaliteto moke. V prvi fazi smo pri predhodno določenih optimalnih procesnih pogojih eksperimente izvajali s farinografom, ki je aparat za določanje upora testa. V drugi fazi raziskav smo pri optimalnih procesnih pogojih beležili z ekstenzogramom časovno spreminjanje pomembnih parametrov pri procesu vzhajanja testa.
Keywords: Pšenična moka, gluten, vitamin C
Published in DKUM: 22.12.2009; Views: 3239; Downloads: 344
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