Fotolitička i fotokemijska razgradnja atrazina u cijevnom reaktoru

master's thesis

• Title (english): Photolytic and photochemical degradation of atrazine in tubular reactor
• Author: Borna Božiković
• Mentor: Tomislav Bolanča (mentor)
• Committee member: Tomislav Bolanča (predsjednik povjerenstva)
• Committee member: Šime Ukić (član povjerenstva)
• Committee member: Hrvoje Kušić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2017-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry; Analytic Chemistry

Abstract

Od dana kada je čovjek stvorio pesticide te ih počeo koristiti, oni su postali onečišćivala jer ih je izuzetno teško razgraditi prirodnim putem. Pesticidi imaju neka pozitivna svojstva no jednom kada uđu u vodeni sustav postaju problem zbog svog štetnog utjecaja. Zbog tih štetnih utjecaja, kako na čovjeka tako i na biljni i životinjski svijet, neki pesticidi uvršteni su na listu prioritetnih tvari Direktive 2013/39/EU, među njima i atrazin, te se njihova koncentracija u vodenom okolišu kontinuirano prati. Stoga proizlazi potreba za pronalaženjem učinkovitih, ali i ekološki prihvatljivih metoda za njihovo uklanjanje. Metode prvog i drugog stupnja obrade otpadnih voda nisu učinkovite za uklanjanje pesticida pa se sve više koriste napredni oksidacijski procesi (eng. Advanced Oxidation Processes, AOP) koji pokazuju bolju učinkovitost. Cilj ovog rada bio je primijeniti procese fotolize i fotooksidacije uz dodatak oksidansa (vodikov peroksid i natrijev persulfat) u cijevnom reaktoru za uklanjanje atrazina nacijepljenog u Zagrebačku vodovodnu vodu. Ispitan je utjecaj parametara procesa (protok i koncentracija oksidansa) na učinkovitost uklanjanja atrazina. Korištenjem kombinacije punog faktorskog plana i metode odzivnih površina (RSM) utvrđeno je da se maksimalno uklanjanje atrazina od 78,11 % postiže primjenom VUV/PS procesa pri protoku 0,6 L/min i koncentraciji persulfata 2 mM što je u skladu s vrijednostima predviđenim RSM modelom (78,68 %). Pokazano je da oba procesna parametra, protok i koncentracija oksidansa, imaju značajan utjecaj na učinkovitost uklanjanja atrazina.

Abstract (english)

Since the day when a man created pesticides and started using them, they became pollutants because it is extremely difficult to degrade them naturally. Pesticides have some positive characteristics but once they enter the aquatic system they become a problem because of their harmful effect. Because of that effects, on humans, plants and animals, some pesticides are included in the list of priority substances of Directive 2013/39/EU, including atrazine, and their concentration in the aquatic environment is continuously monitored. Therefore, there is a need to find effective, but also environmentally acceptable methods for removing them. Methods of first and second stage wastewater treatment are not effective for the removal of pesticides, so Advanced Oxidation Processes (AOPs) are increasingly used and shown to be more effective. The aim of this work was to apply photolysis and photooxidation processes with the addition of oxidants (hydrogen peroxide and sodium persulfate) in a tubular reactor for removing atrazine from Zagreb water supply. The influence of the process parameters (flow and concentration of oxidants) on the efficiency of atrazine removal was studied. Using a combination of full factor plan and response surface methodology (RSM), the maximum removal of atrazine of 78.11 % was achieved by applying a VUV/PS process at a flow rate of 0.6 L/min and a persulfate concentration of 2 mM which was in accordance with the predicted values RSM model (78.68 %). It has been shown that both process parameters, flow and concentration of oxidants have a significant effect on the efficiency of atrazine removal.

• Keywords: atrazin; napredni oksidacijski procesi; fotoliza; fotooksidacija; metoda odzivnih površina
• Keywords (english): atrazine; advanced oxidation processes; photolysis; photooxidation process; response surface methodology
• Language: croatian
• URN:NBN: urn:nbn:hr:149:813253
• 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: 2020-04-23 10:04:17