Uklanjanje nitrata iz otpadnih voda modificiranim nusproizvodima prehrambene industrije
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.
|Creator||Nujić, Marija (Search Europeana for this person)|
|Collection||Josip Juraj Strossmayer University of Osijek. FACULTY OF FOOD TECHNOLOGY. Department of Applied Chemistry and Ecology. Sub-department of Chemistry and Ecology.|
|Subject Terms||water, wastewater, nitrates, ion exchange, BIOTECHNICAL SCIENCES. Food Technology. Engineering., Public health engineering. Water. Sanitation. Illuminating engineering, Chemistry. Crystallography. Mineralogy|
|Provider||National and University Library in Zagreb|