20.500.12556/DKUM-71024 Učinkovitost razgradnje bisfenola A po hidrotermičnem procesiranju odpadne vode Degradation efficiency of bisphenol A by hydrothermal treatment of wastewater Namen magistrskega dela je bil s sub- in superkritično oksidacijo v vodi degradirati bisfenol A (BPA). Poleg koncentracije BPA smo v vzorcih pri optimalnih pogojih preverjali tudi prisotnost oz. zmanjšanje organskih snovi z določanjem kemijske potrebe po kisiku (KPK) in celotnega organskega ogljika (TOC). S spreminjanjem glavnih parametrov pri hidrotermičnem procesiranju vode – temperature, tlaka in pretoka raztopine, smo z začetnimi poskusi v ultra čisti vodi najprej želeli določiti optimalne pogoje za obdelavo vzorcev z dodanim BPA. Najboljše rezultate smo dosegli s superkritično oksidacijo pri T = 500 °C, p = 275 bar in ϕV = 1,5 mL/min, kjer smo dosegli popolno degradacijo bisfenola A. Z izbranimi (optimalnimi) pogoji pri posameznih temperaturah smo nato hidrotermično obdelali še vzorce sintetične odpadne vode v katero smo dodali BPA. Tudi tokrat smo najvišjo, 99,5 %, degradacijo dosegli pri že prej navedenih pogojih. Pri teh pogojih smo dosegli tudi najvišja odstotka znižanja vrednosti KPK in TOC in sicer 62,32 % pri vrednosti KPK ter 18,03 % pri vrednosti TOC. Ugotovili smo, da je BPA zelo odporen na zunanje vplive in da je za njegovo degradacijo v vodi bolj primerna superkritična, kot pa subkritična oksidacija, le-ta pa mora potekati pri zelo ostrih pogojih (visoka temperatura in tlak) ter dolgih zadrževalnih časih v sistemu. The purpose of this master's thesis was to degrade bisphenol A (BPA) in sub- and supercritical water. In addition to BPA concentration, the presence of organic substances or their reduction in samples under optimal conditions was examined by determining the chemical oxygen demand (COD) and total organic carbon (TOC). By changing the main parameters in hydrothermal water processing - the temperature, pressure and solution flow, we sought to determine the optimal conditions for the treatment of BPA spiked samples using initial experiments in ultra-pure water. The best results were attained by supercritical oxidation at T = 500 °C, p = 275 bar and ϕV = 1.5 mL/min, where complete degradation of bisphenol A was achieved. Under the experimentally determined optimal conditions at each temperature, the synthetic BPA spiked water samples were hydrothermally treated. Similarly, the highest, 99.5 % degradation was attained under previously stated conditions. The highest percentage of COD and TOC reduction, 62.32 % and 18.03 % respectively, was also achieved under these conditions. It has been ascertained that BPA is highly resistant to external impacts and that supercritical oxidation is more suitable for its degradation than subcritical oxidation. The process must be carried out under very harsh conditions (high temperature and pressure) and long system retention times. bisfenol A degradacija hidrotermično procesiranje subkritična oksidacija superkritična oksidacija odpadna voda bisphenol A degradation hydrothermal treatment subcritical oxidation supercritical oxidation wastewater true true false [M. Seitl] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2018-07-02 10:16:39 2018-07-13 13:23:59 2022-08-01 20:16:34 2019-07-11 18:27:39 2018 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 628.16:66.094.3(043.2) 21601814 URN:SI:UM:DK:Z8T7RELL MAG_Seitl_Masa_2018.pdf MAG_Seitl_Masa_2018.pdf 1 C345F84AC215B2E878579F7757F2D6B3 1bee6b691ef3dee85fedb25411ae8eeaf4c154dd1ac321730add385e7c33e0eb 197450fd-7c10-11eb-bb7a-00155d0001ca 20.500.12556/dkum/6a51830e-c19c-4726-a4b3-5e18dbc8752b https://dk.um.si/Dokument.php?lang=slv&id=126462 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0