Spremembe strupenosti pri ozonaciji odpadne vode

diplomsko delo

Janja Kramarič (Author), Gabriela Kalčíková (Mentor)

Abstract

Napredni oksidacijski procesi so metode oksidacije, pri katerih dobimo zelo močan oksidant hidroksilni radikal (•OH). Ti procesi se uporabljajo predvsem za oksidacijo organskih onesnaževal, ki se v procesu lahko popolnoma mineralizirajo do ogljikovega dioksida, vode in anorganskih spojin. Kadar mineralizacija ni popolna, dobimo oksidacijske medprodukte, ki so lahko bolj strupeni od začetne organske molekule, zato moramo preveriti tudi njihov vpliv na okolje. V diplomskem delu smo se osredotočili predvsem na študijo sprememb strupenosti pri ozonaciji odpadne vode. Kot modelno odpadno vodo smo uporabili raztopino tiamulin fumarata s koncentracijo 400 mg/L. Raztopino smo ozonirali v štirih ciklih šaržne ozonacije. Vsak cikel je trajal 10 minut. Spremembo strupenosti antibiotika med oksidacijo smo ugotavljali z ekotoksikološkimi testi z malo vodno lečo Lemna minor. Poleg strupenosti smo analizirali še spremembo celotnega organskega ogljika med ozonacijo. Rezultati so pokazali, da raztopina timaulin fumarata in ozonirani vzorci te raztopine zavirajo rast male vodne leče ter zmanjšujejo koncentracijo klorofila v členkih rastline. Strupenost raztopine se po ozonaciji ni spremenila, saj so razlike specifičnih rasti členkov male vodne leče vseh ozoniranih vzorcev napram začetni raztopini antibiotika zelo majhne. Kljub temu, da se je koncentracija celotnega organskega ogljika med ozonacijo zmanjšala, pa se strupenost ni spremenila, kar nakazuje na prisotnost medproduktov, ki so prav tako strupeni.

Keywords

odpadne vode;čiščenje odpadnih vod;napredni oksidacijski procesi;ozonacija;strupenost;hidroksil radikal;mala vodna leča Lemna minor;diplomska dela;

Data

Language:	Slovenian
Year of publishing:	2019
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher:	[J. Kramarič]
UDC:	628.3:66.094.3(043.2)
COBISS:	1538433987
Views:	812
Downloads:	226
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Changes of toxicity during ozonation of wastewater
Secondary abstract:	Advanced oxidation processes are methods of oxidation, in which a very strong oxidazing agent, hydroxyl radical, is generated. They are mainly used for the oxidation of organic pollutants, which can be completly mineralized to carbon dioxide, water and inorganic compounds. When mineralization is incomplete, oxidation by-products are obtained and may be even more toxic than the initial organic molecule. Their impact on the environment needs to be assessed. The aim of this diploma thesis was to study the toxicity of ozonated wastewater. A solution of the antibiotic, tiamulin fumarate, in a concentration 400 mg/L was used as the model wastewater. The solution was treated with four ozonation cycles in a batch reactor. Each cycle lasted 10 minutes. The effects of antibiotic were determined by ecotoxicological tests on duckweed Lemna minor. In addition to toxicity testing, we also analysed the content of total organic carbon during ozonation. The results of the experiment have shown that the solution of timulin fumarate and the ozonated samples of this solution inhibit the growth of a Lemna minor and reduce the concentration of chlorophyll in fronds of the plant. The toxicity of the solution did not change after ozonation, as the differences in the specific growth of all of the ozonated samples compared to the initial antibiotic solution are very small. Despite the fact that the total organic carbon decreased during ozonation, the toxicity did not change, indicating the presence of toxic by-products.
Secondary keywords:	AOPs;duckweed Lemna minor;hydroxyl radical;ozonation;toxicity;
Type (COBISS):	Bachelor thesis/paper
Study programme:	1000372
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo
Pages:	23 f.
ID:	11228378