Utjecaj visokonaponskoga električnoga pražnjenja na obradu modelnih sustava koji simuliraju otpadne vode iz proizvodnje maslinova ulja

doctoral thesis

• Title (english): Effect of high voltage electric discharge on treatment of model systems simulating wastewater from olive oil production
• Author: Mia Ivanov
• Mentor: Zoran Herceg (mentor)
• Committee member: Tomislava Vukušić Pavičić (predsjednik povjerenstva)
• Committee member: Tibela Landeka Dragičević (član povjerenstva)
• Committee member: Mirna Habuda-Stanić (član povjerenstva)
• Committee member: Dubravka Škevin (član povjerenstva)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Engineering); (Laboratory for Food Processes Engineering); Zagreb
• Defense date and country: 2023-10-03, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology
• Universal decimal classification (UDC): 620 - Materials testing. Power stations. Economics of energy

Abstract

Cilj ovog istraživanja bio je ispitati utjecaj visokonaponskog električnog pražnjenja na obradu modelnih sustava sastava sličnog otpadnoj vodi iz procesa proizvodnje maslinova ulja (OVM) te potom dobivena znanja primijeniti na obradu realnog sustava OVM-a. Prva faza istraživanja provodila se na modelnom sustavu sastavljenom od četiri polifenolna spoja (hidroksitirosolu, tirosolu, vanilinskoj kiselini i oleuropeinu). Svim uzorcima modelnog sustava određeni su fizikalno-kemijski parametri (pH, električna vodljivost, temperatura te prisutnost NO₂-, NO₃- i H₂O₂ ), a također su provedene HPLC i NIR analiza.
Na osnovu dobivenih rezultata u prvoj fazi, u drugoj fazi je proveden eksperiment visokonaponskog električnog pražnjenja na OVM prema Box Behnken dizajnu eksperimenta koji je uključivao tri različite varijable: napon (30, 40 i 50 kV), vrijeme tretmana (10, 20 i 30 min) te primijenjeni plin (kisik, dušik i zrak). Na svim uzorcima su provedene fizikalno-kemijske analize (pH, temperatura, električna vodljivost, zasićenost kisikom te prisutnost NO₂-, NO₃-, H₂O₂, NH₄+, PO₄-, ukupni N i P te određivanje boje), HPLC, EPR te NIR analiza. Prema dobivenim rezultatima najučinkovitijim tretmanom za razgradnju polifenolnih spojeva se pokazao tretman napona 50 kV u trajanju 30 minuta te uz primjenu kisika, dok je najveće smanjenje KPK i najveća promjena boje postignuta tretmanom napona 40 kV u trajanju 30 minuta uz primjenu zraka.

Abstract (english)

The aim of this research was to examine the influence of high-voltage electric plasma discharge on the treatment of model solution with a composition similar to olive mill wastewater (OMWW), and then apply gained knowledge to the treatment of an OMWW. The initial phase of the study was carried out on a model solution composed of four polyphenolic compounds (hydroxytyrosol, tyrosol, vanillic acid and oleuropein). Physicochemical parameters (pH, electrical conductivity, temperature and presence of NO₂-, NO₃- i H₂O₂) were determined for all samples, as well as HPLC and NIR analysis.
Building upon the outcome of the first phase, in the second phase, an experiment of high-voltage electric discharge was carried out on the OMWW according to the Box Behnken design of the experiment, which included three different variables: voltage (30, 40 and 50 kV), treatment time (10, 20 and 30 min) and the applied gas (oxygen, nitrogen and air). Physicochemical analyses (pH, temperature, electrical conductivity, oxygen saturation and the presence of NO₂-, NO₃-, H₂O₂, NH₄+, PO₄-, total N and P and color determination), HPLC, EPR and NIR analysis were performed on all samples. According to the obtained results, the most effective treatment for the degradation of polyphenolic compounds was the treatment at a voltage of 50 kV for 30 minutes with oxygen, while the greatest reduction in COD and the highest change of color was achieved with the treatment at a voltage of 40 kV for 30 minutes with air

• Keywords: visokonaponsko električno pražnjenje; OVM; fenolni spojevi
• Keywords (english): high-voltage electric plasma discharge; OMWW; polyphenols
• Language: croatian
• URN:NBN: urn:nbn:hr:159:872928
• Promotion: 2023
• Study programme: Title: Postgraduate PhD Study in Nutrition; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje biotehničkih znanosti, polje nutricionizam (doktor/doktorica znanosti, područje biotehničkih znanosti, polje nutricionizam)
• Type of resource: Text
• Extent: 94 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-08-31 12:08:19