20.500.12556/DKUM-40741 MIKROFILTRACIJA MODELNIH OLJNO VODNIH EMULZIJ MICROFILTRATION OF MODEL OIL-IN-WATER EMULSION Cilj diplomskega dela je bil raziskati učinkovitost membrane s steklenimi vlakni in polisulfonske membrane pri procesu odstranjevanja olj z mikrofiltracijo iz oljno vodnih emulzij kovinsko-predelovalne industrije. Z različno kombinacijo obratovalnih pogojev, predvsem pH vrednosti (pH = 5, 7 in 9), koncentracije olj (0,5, 1,5 in 3 %) in dodatka soli (0,1 in 5 g) CaCl2 smo želeli doseči čim večjo gostoto volumskega toka. Kot predčiščenje smo uporabili elektrokoagulacijo. Rezultati kažejo, da je pri filtriranju skozi membrano s steklenimi vlakni veliko višja gostota volumskega toka, če jo primerjamo s polisulfonsko membrano. Najvišjo gostoto volumskega toka smo dosegli pri najnižji koncentraciji olja (φ = 0,5 %), pH = 9 in sobni temperaturi (t = ~20±3 ˚C). Prevladujoči mehanizem mašenja membrane s steklenimi vlakni je bil nastanek filtrnega kolača na površini membrane, posledično pa se zniža gostota volumskega toka permeata. Opravili smo fizikalno-kemijske analize modelne oljno vodne emulzije in permeata. Ugotovili smo, da se motnost in vrednost kemijske potrebe po kisiku znižata po mikrofiltraciji. Elektrokoagulacija ne zniža mašenja membran. The aim of this thesis was to explore the efficiency of glass microfibre membrane and polysulphide membrane for microfiltration in the process of removing oil from oil-in-water emulsions in metal-processing industry. The aim was to achieve the maximum flux with combinations of operating conditions, such as pH values (pH at 5, 7 and 9), oil concentration (0,5, 1,5 and 3 %) and salt addition (0,1 and 5 g) CaCl2. Electrocoagulation was used as a pretreatment method. The results show that at the filtration, the glass microfibre filters proved to be more efficient because the polysulfide membrane enabled much lower fluxes. The highest density of the volume flow was achieved at the lowest concentration of oil, φ = 0,5 %, alkaline pH (pH = 9) and room temperature (t = ~20±3 ˚C). The dominant mechanism of membrane fouling with glass microfibre filters was cake formation on the surface of the membrane during microfiltration, and consequently decreased the flux. We performed phisico-chemical analyses of the model oil-in-water emulsions and permeate. The turbidity and value of chemical oxygen demand decreased during microfiltration. Electrocoagulation is inefficient as a pretreatment method. mikrofiltracija olja emulzija mašitev stekleni filter microfiltration oils emulsion fouling glass membrane true true false [L. Novak] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2013-06-12 15:11:20 2013-06-19 13:38:00 2022-05-03 03:06:00 2021-04-24 03:16:46 2013 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.773.32:66.081.6(043.2) 17477142 URN:SI:UM:DK:NP6NRUL4 VS_Novak_Liljana_2013.pdf VS_Novak_Liljana_2013.pdf 1 7A8F1657D03B203468D47F143B2F1A0C 4647eca17e2824224b4b4bf63780ad0fc17df0b6cfea9cf7137dae0543fa049b 04e3e9cc-7c0a-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=55883 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0