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doctoral thesis
Uklanjanje nitrata iz otpadnih voda modificiranim nusproizvodima prehrambene industrije
Osijek: Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY, 2017. urn:nbn:hr:109:338184
Nujić, Marija
Josip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
Department of Applied Chemistry and Ecology
Sub-department of Chemistry and Ecology

Institutional repository: Repository of the Faculty of Food Technology Osijek

Cite this document

Nujić, M. (2017). Uklanjanje nitrata iz otpadnih voda modificiranim nusproizvodima prehrambene industrije (Doctoral thesis). Osijek: Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY. Retrieved from https://urn.nsk.hr/urn:nbn:hr:109:338184

Nujić, Marija. "Uklanjanje nitrata iz otpadnih voda modificiranim nusproizvodima prehrambene industrije." Doctoral thesis, Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY, 2017. https://urn.nsk.hr/urn:nbn:hr:109:338184

Nujić, Marija. "Uklanjanje nitrata iz otpadnih voda modificiranim nusproizvodima prehrambene industrije." Doctoral thesis, Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY, 2017. https://urn.nsk.hr/urn:nbn:hr:109:338184

Nujić, M. (2017). 'Uklanjanje nitrata iz otpadnih voda modificiranim nusproizvodima prehrambene industrije', Doctoral thesis, Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY, accessed 26 November 2024, https://urn.nsk.hr/urn:nbn:hr:109:338184

Nujić M. Uklanjanje nitrata iz otpadnih voda modificiranim nusproizvodima prehrambene industrije [Doctoral thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY; 2017 [cited 2024 November 26] Available at: https://urn.nsk.hr/urn:nbn:hr:109:338184

M. Nujić, "Uklanjanje nitrata iz otpadnih voda modificiranim nusproizvodima prehrambene industrije", Doctoral thesis, Josip Juraj Strossmayer University of Osijek, FACULTY OF FOOD TECHNOLOGY, Osijek, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:109:338184

Metadata
TitleUklanjanje nitrata iz otpadnih voda modificiranim nusproizvodima prehrambene industrije
Title (english)Nitrate removal from wastewaters by modified food industry by-products
AuthorMarija Nujić
MentorMirna Habuda-Stanić (mentor)
Committee memberBorislav Miličević (predsjednik povjerenstva)
Committee memberLidija Jakobek Barron (član povjerenstva)
Committee memberMarin Matošić (član povjerenstva)
MBZ: 211030
Committee memberNatalija Velić (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
FACULTY OF FOOD TECHNOLOGY
(Department of Applied Chemistry and Ecology)
(Sub-department of Chemistry and Ecology)
Osijek
Defense date and country2017-03-24, Croatia
Scientific / art field,
discipline and subdiscipline		BIOTECHNICAL SCIENCES
Food Technology
Engineering
Universal decimal classification
(UDC)		628 - Public health engineering. Water. Sanitation. Illuminating engineering
54 - Chemistry. Crystallography. Mineralogy
Abstract
Onečišćenje vodnih resursa spojevima dušika značajan je ekološki i zdravstveni problem. Stoga ih je važno ukloniti iz vode i jedna od najčešće korištenih metoda za uklanjanje nitrata je ionska izmjena. U radu je ispitana mogućnost adsorpcije nitratnih iona iz modelne otopine nitrata, modelne otpadne vode i otpadnih voda konditorske i mliječne industrije na tri modificirana nusproizvoda prehrambene industrije: ljuske lješnjaka, pivskog tropa i sjemenki grožđa te komercijalnog anionskog izmjenjivača. Ispitivanje adsorpcijskih svojstava navedenih materijala podrazumijevalo je mijenjanje početne koncentracije nitrata, vrijeme adsorpcije, pH vrijednost, koncentraciju adsorbensa i temperaturu. Rezultati istraživanja pokazali su smanjenje učinkovitosti uklanjanja nitrata povećanjem njihove početne koncentracije. Dobiveni podaci obrađeni su matematičkim modelima Langmuirove, Freundlichove i Dubinin-Radushkevicheve adsorpcijske izoterme. S ciljem opisivanja mehanizama adsorpcije ispitani su i kinetički modeli pri čemu je kinetički model pseudo-drugog reda najbolje opisao brzinu adsorpcije. Ispitivanja u koloni pokazali su dobra svojstva ispitanih materijala i nakon tri ciklusa, osobito u modelnoj otopini nitrata. Karakterizacija modificiranih nusproizvoda provedena je pretražnim elektronskim mikroskopom (FE SEM) kao i IR spektroskopijom. Iz dobivenih rezultata, može se zaključiti da su modificirani materijali pogodni za uklanjanje nitrata iz otpadnih voda i da su jednako učinkoviti kao i komercijalni ionski izmjenjivači.
Abstract (english)
Pollution of water resources by nitrogenous compounds presents significant environmental and health problem. Therefore, it is important to remove them, especially from wastewater treatment effluents in order to contribute to healthier environment. The most common method for nitrate removal is ion exchange. The paper examines the possibility of nitrate adsorption from model solutions of nitrate, model wastewater and waste water from confectionery and dairy industry on three modified food industry by-products: hazelnuts shells, brewers' spent grains and grape seeds, and on commercial anion exchanger. Adsorption properties of these materials were tested by changing the initial nitrate concentration, adsorption time, pH, adsorbent dosage and temperature. The results showed a reduction of nitrate removal efficiency by increasing their initial concentration. The obtained data were fitted in Langmuir, Freundlich and Dubinin-Radushkevich isotherms. To describe the mechanism of adsorption, few kinetic models were tested, and the pseudo-second order model fitted the data well. The sorption effect of tested materials sustained well during three sorption-desorption cycles, especially in model nitrate solution. Characterization of modified by-products was carried out by the scanning electron microscope (SEM) and IR spectroscopy. It can be concluded that the modified materials are suitable for nitrate removal from wastewater and might compete with commercial ion exchangers.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:109:338184
Study programmeTitle: Food Engineering
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje biotehničkih znanosti, polje prehrambena tehnologija (doktor/doktorica znanosti, područje biotehničkih znanosti, polje prehrambena tehnologija)
Type of resourceText
Extent8, 254 str. ; 30 cm
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2017-05-30 08:05:04