Uklanjanje fenola iz otpadnih voda

master's thesis

• Title (english): Removal of the phenol from wastewaters
• Author: Hana Narančić
• Mentor: Lidija Furač (mentor)
• Committee member: Lidija Furač (predsjednik povjerenstva)
• Committee member: Matija Cvetnić (član povjerenstva)
• Committee member: Dajana Kučić Grgić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-09-08, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Fenol, jedan od najčešćih organskih onečišćivala vode, vrlo je otrovan čak i u niskim koncentracijama. Često se koristi u raznim industrijskim procesima kao što su proizvodnja ljepila, petrokemijska industrija, građevinarstvo i automobilska industrija te na taj način i dospijeva u otpadne vode koje se iz tih industrijskih postrojenja ispuštaju. Prije ispuštanja u okoliš, fenol je potrebno ukloniti iz otpadnih voda. Napredni oksidacijski procesi (AOP) nametnuli su se kao vrlo učinkovito rješenje uklanjanja fenola iz otpadnih voda. U ovim procesima, uz utrošak energije, nastaju reaktivni radikali koji reagiraju sa organskim spojem te u konačnici nastaju voda i ugljikov dioksid. Zadatak ovog rada je provesti obradu modelne vode onečišćene fenolom te odrediti kako procesni parametri utječu na učinkovitost uklanjanja fenola. Korištena je napredna oksidacijska tehnika uz UVC zračenje te vodikov peroksid (H2O2) i natrijev persulfat (Na2S2O8) kao oksidacijska sredstva. Izrađen je puni faktorski plan eksperimenta na tri razine. Procesni parametri čiji je utjecaj promatran su pH (od 4 do 10) i koncentracija oksidansa (od 10 do 200 mM). Rezultati ovog rada pokazali su da na razgradnju fenola metodom UV/H2O2 utječe pH vrijednost dok koncentracija oksidansa ne utječe. Na razgradnju fenola metodom UV/S2O8 utječe koncentracija okisidansa, a pH vrijednost nema utjecaja. Provedena je i izravna fotoliza fenola UVC zračenjem te su rezultati pokazali da niže pH vrijednosti pogoduju razgradnji fenola u ovim uvjetima.

Abstract (english)

Phenol, one of the most common organic water pollutants, is highly toxic even in low concentrations. Phenol is often used in various industrial processes such as production of adhesives, petrochemical industry, construction and automotive industry. Result is that phenol ends up in the wastewater from these industries. Before releasing into the environment, phenol must be removed from wastewater. Advanced oxidation processes have emerged as a very effective solution for removing phenol from wastewater. In these processes, with the consumption of energy, reactive radicals are formed and they react with organic compound and produce water and carbon dioxide. The purpose of this work was to perform the treatment of water contamined with phenol and to investigate the influence of process parameters on the efficiency of the treatment. An advanced oxidation technique was used with UVC radiation and hydrogen peroxide or sodium persulfate as an oxidizing agent. For this purpose, a full factorial design of the experiment was created at three levels. The influence of process parameters, pH (from 4 to 10) and oxidant concentration (from 10 to 200 mM) was observed. The results of this work revealed that the pH is significant while the concentration of oxidant is not significant for UV/H2O2, while the concentration of oxidants is significant and the pH is not significant for UV/S2O8 technique. Direct photolysis of phenol by UVC radiation was also performed and the results revealed that lower pH favor the decomposition of phenol under these conditions.

• Keywords: fenol; otpadne vode; napredni oksidacijski procesi; UVC; peroksid; persulfat
• Keywords (english): phenol; wastewater; advanced oxidation processes; UVC; peroxide; persulfate
• Language: croatian
• URN:NBN: urn:nbn:hr:149:311834
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Applied organic chemistry; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-09-14 13:36:42