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Title:VPLIV MAGNETNEGA POLJA NA BAKTERIJE V BIOLOŠKIH ČISTILNIH NAPRAVAH IN NA PRETVORBO DUŠIKA
Authors:ID Filipič, Jasmina (Author)
ID Kokol, Vanja (Mentor) More about this mentor... New window
ID MANDIĆ-MULEC, INES (Comentor)
Files:.pdf DR_Filipic_Jasmina_2013.pdf (2,99 MB)
MD5: 1781E05FAA6167A02DA25F913F102C8D
PID: 20.500.12556/dkum/581367c8-f592-4c6a-87a3-62a95262327a
 
Language:Slovenian
Work type:Dissertation
Organization:FS - Faculty of Mechanical Engineering
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
Place of publishing:[Maribor
Publisher:J. Filipič]
Year of publishing:2013
PID:20.500.12556/DKUM-40217 New window
UDC:628.354.2:631.461.4(043.3)
COBISS.SI-ID:267399936 New window
NUK URN:URN:SI:UM:DK:A9CSOCNV
Publication date in DKUM:04.06.2013
Views:2785
Downloads:298
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
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Secondary language

Language:English
Title:EFFECT OF MAGNETIC FIELD ON THE WASTEWATER BACTERIA AND ON THE NITROGEN CONVERT
Abstract:In this doctoral dissertation we were foccusing on influence of static magnetic field (SMP) of intermediate strenght on nitrogen removal from wastewater. Current legislation and high costs of environmental taxes for water pollution call for development of advanced technologies for cleaning wastewaters. Previous published work indicated a positive role of SMF in removal of organic polutants from wastewater. In line with this our study shows that SMF of strength B = (30, 50) mT (but not B = 10 mT) had a positive influence on the removal of organic compounds in SBR reactors. Furthermore, the rate of ammonium-oxidation dramatically increased, for up to w = 85 ± 5 % under the influence of SMF B=50mT. Based on the positive influence of SMF on wastewater treatment we continued to explore the effect of SMF on three bacteria which are commonly found in wastewater: Nitrosomonas europaea, Escherichia coli and Pseudomonas putida. The results of our research showed that SMF (B = 17 mT) has a negative influence on the growth of bacteria E. coli and P. putida, but positive on dehydrogenase activity and concentration of intracellular ATP. Inhibitory influence on the last two bacteria was the greatest at their optimal temperatures of growth. Furthermore, the results of this thesis show for the first time that SMF (B = 17 mT) has a positive influence on the oxidation of ammonium nitrogen by N.europaea bringingup to w = 60 % incerase after seven days of exposure to SMF in comparison to control samples, which were unexposed. Similarly, we oberved a positive influence on ammonium oxidation by mixed community of wastewater ammonium-oxidation bacteria present in wastewater, where conversion of ammonium to nitrate incresd for w = 40 % under the influence of SMF. Our study shows that at SMF of intermediate strenght increases removal of ammonium nitrogen from wastewater in temperature and time dependent manner and induces the growth of one of the most important nitrifiers in wastewater, namely Nitrosomonas europaea.
Keywords:wastewater, bacteria, static magnetic field, nitrogen compounds, nitrification, denitrifiction


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