Učinkovitost razgradnje 17 ß-estradiola u vodi UV-A/FeZSM5 procesom

master's thesis

• Title (english): Efficiency of 17 ß-estradiol degradation in water by UV-A/FeZSM5 process
• Author: Valentino Sambolek
• Mentor: Hrvoje Kušić (mentor)
• Committee member: Hrvoje Kušić (predsjednik povjerenstva)
• Committee member: Ana Lončarić Božić (član povjerenstva)
• Committee member: Martina Biošić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-07-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Environmental Protection in Chemical Engineering

Abstract

Razni farmaceutici, aktivne farmaceutske supstance i biološki aktivni spojevi nalaze se u okolišu te predstavljaju opasnost po ljude, biljke i životinje. Estrogen 17 ß-estradiol (E2) je supstanca koja je nepoželjna u okolišu zbog svojeg djelovanja na hormonski sustav živih organizama. Sukladno tome, Europska Unija je svrstala ovaj spoj tijekom zadnje prioritizacije na tzv. "watch list", tj. na listu spojeva sa potencijalno štetnim djelovanjem koji trebaju biti praćeni u okolišu. Trenutne tehnologije obrade otpadnih voda nisu u mogućnosti učinkovito ukloniti najnovije prioritetne tvari stoga se razvijaju nove metode kojima bi se nadopunile postojeće metode obrade. Napredni oksidacijski procesi pružaju moguću alternativu ili nadopunu komercijalnim i konvencionalnim metodama obrade, stoga se ovim radom procijenila mogućnost razgradnje E2 UV-A/FeZSM5/H2O2 procesom sa naglaskom na korištenje UV-A zračenja koje se nalazi i unutar sunčevog zračenja (do 5%). Eksperimentima je ispitivan utjecaj odabranih procesnih parametara; početnog pH, koncentracije oksidansa i koncentracije katalizatora (sintetskog zeolita sa izmijenjenim željezovim ionima; FeZSM5) na razgradnju E2. Kako bi se odredile optimalne vrijednosti procesnih parametara, pri kojima će razgradnja biti najveća, primijenjen je Box-Behnkenov faktorski plan eksperimenta s 3 procesna parametra na 3 razine u kombinaciji s metodom odzivnih površina (RSM). Utvrđeno je da svi ispitivani procesni parametri znatno utječu na brzinu razgradnje, dok je utjecaj pH vrijednosti daleko najveći. Određeni su optimalni uvjeti: pH vrijednosti 3, [H2O2]= 50 mM i [Fe]FeZSM5=2,0 mM, kod kojih se postiže maksimalna brzina razgradnje E2 od 8,31*10^-5 s^-1.

Abstract (english)

Various pharmaceuticals, active pharmaceutical ingredients and biologically active compounds are being found in the environment presenting serious treat for humans, animals and plants. Steroid estrogen 17 ß-estradiol is undesirable in the environment because of its influence on the hormonal and endocrine system of living beings. Therefore, the European Union, throughout its Directives addendums, listed E2 among the priority substances, actually E2 was placed at "watch" list of potentially harmful compounds which presence in the environment needs to be monitored. Currently available technologies for wastewater treatment can not effectively remove priority substances from water, thus development of new methods is highly demanded. Advanced oxidation processes provide an alternative or upgrade to the common conventional water treatment methods, therefore, this work was aimed at evaluation of applicability of UV-A/FeZSM5/H2O2 process for E2 degradation emphasizing the application of UV-A irradiation which exists in the global irradiation up to 5%. The experiments were directed to the investigation of the effects of selected process parameters; initial pH, the concentration of oxidant and the concentration of catalyst (iron-exchanged synthetic zeolite; FeZSM5) on the degradation of E2. In order to determine the optimal process parameters, Box-Behnken design of experiments with 3 process parameters on 3 levels was applied in combination with the response surface methodology (RSM). It was determined that all studied process parameters significantly influenced E2 degradation rate, but it should be pointed out that pH influence is the highest. The optimal conditions: pH 3, [H2O2] = 50 mM and [Fe] FeZSM5= 2.0 mM, yielded the maximum degradation rate of E2 of 8.31*10^-5 s^-1.

• Keywords: farmaceutici; 17 ß-estradiol; napredni oksidacijski procesi; heterogeni Fenton proces
• Keywords (english): pharmaceuticals; 17 ß-estradiol; advanced oxidation process; heterogeneous Fenton process
• Language: croatian
• URN:NBN: urn:nbn:hr:149:904726
• Study programme: Title: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka ekoinženjerstva (magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2016-12-20 13:49:12