magistrsko delo
Karolina Smrkolj (Author), Domen Leštan (Reviewer), Davor Kržišnik (Mentor), José Manuel Carito Gonçalves (Co-mentor)

Abstract

Odpadne vode predstavljajo resen okoljski izziv, zato postaja njihovo čiščenje in ponovna uporaba vse bolj pomembna. Tradicionalne metode čiščenja imajo številne pomanjkljivosti, kot so velika poraba energije, uporaba reagentov ter visoki stroški. V zadnjem času se zato vedno pogosteje uporabljajo napredni oksidativni procesi, kot sta peroksidacija in hladna plazma. Hladna plazma je delno ioniziran plin, ki vsebuje reaktivne vrste, kot so ioni, elektroni in prosti radikali, ki z oksidacijo učinkovito odstranjujejo onesnaževala. V okviru magistrske naloge smo preučevali učinek vodikovega peroksida in hladne plazme na bakteriji E. coli in B. subtilis. Ugotovili smo, da daljši čas izpostavljenosti in višje koncentracije vodikovega peroksida povečujejo delež inaktivacije bakterij. Pri koncentraciji 1,5 ml/l smo dosegli 100 % inaktivacijo bakterije E. coli po 30 minutah, medtem ko je bila pri B. subtilis inaktivacija počasnejša. Pri nižjih koncentracijah (0,5 ml/l) je bil dosežen le 9-odstotni delež inaktivacije, uspešnejši pri B. subtilis. Hladna plazma je bila pri inaktivaciji bakterij učinkovitejša od vodikovega peroksida, pri čemer se je učinkovitost prav tako povečala z daljšim časom izpostavljenosti. Razvili smo enostavno napravo za generacijo hladne plazme, ki je omogočila testiranje na bakterijskih kulturah. Rezultati kažejo, da ima hladna plazma velik potencial za čiščenje odpadne vode, vendar bodo za optimizacijo naprave in natančno določanje njenega vpliva potrebne dodatne raziskave.

Keywords

wastewater;reuse;cold plasma;bacterial inactivation;hydrogen peroxide;oxidative processes;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [K. Smrkolj]
UDC: 606:628.179.2(043.2)
COBISS: 232462339 Link will open in a new window
Views: 64
Downloads: 21
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Other data

Secondary language: English
Secondary title: Advanced oxidation processes for waste water treatment with the aim of reuse
Secondary abstract: Wastewater poses a serious challenge to the environment and its treatment and reuse is becoming increasingly important. Conventional treatment methods have many disadvantages, such as high energy consumption, the use of reagents and high costs. Recently, advanced oxidative processes such as peroxidation and cold plasma have been increasingly used. Cold plasma is a partially ionised gas containing reactive species such as ions, electrons and free radicals that effectively remove pollutants by oxidation. In this master thesis, the effect of hydrogen peroxide and cold plasma on E. coli and B. subtilis was investigated. We found that longer exposure times and higher concentrations of hydrogen peroxide increased the inactivation rate of the bacteria. At a concentration of 1.5 mL/L, 100 % inactivation of E. coli was achieved after 30 minutes, while B. subtilis showed slower inactivation. At lower concentrations (0.5 mL/L), only 9% inactivation was achieved, with B. subtilis showing a better success rate. Cold plasma was more effective than hydrogen peroxide in inactivating the bacteria, with efficacy also increasing with increasing exposure time. A simple device for generating cold plasma was developed to perform tests on bacterial cultures. The results show that cold plasma has great potential for wastewater treatment, but further research is needed to optimise the device and determine its exact effect.
Secondary keywords: odpadna voda;ponovna uporaba;hladna plazma;bakterijska inaktivacija;vodikov peroksid;oksidativni procesi;
Type (COBISS): Master's thesis/paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Študij biotehnologije
Pages: 1 spletni vir (1 datoteka PDF (IX, 47 str., [3] str. pril.))
ID: 26206900