ANALYSIS OF THE EFFECTS OF A WASTEWATER TREATMENT PLANT FAILURE ON THE DRAVA RIVER WATER QUALITY

1D model of the Drava River, between 00 + 543 rkm and 69 +118 rkm, was created by the MIKE 11 river-modeling tool. The aim of this model was to analyze the river water quality (WQ). Compared to the real Drava River section, the model was simplified to exclude any tributaries for the purpose of the water quality analysis. The inflow boundary was specified upstream, in addition to the WQ parameters (dissolved oxygen (DO), temperature, ammonia nitrogen, nitrate nitrogen, total phosphorus and orthophosphate, and five-day biochemical oxygen demand (BOD5)). The water level and open boundary conditions were specified at the downstream end of section. The WQ parameters, mentioned earlier, were also defined at the Belišće wastewater treatment plant (WWTP) (54 + 373 rkm) and at the wastewater outlet near Osijek (14 + 580 rkm). The model was then used to simulate the effect on the WQ of the Drava River in a hypothetical extreme scenario: the 2-day failure of the Belišće WWTP. It was assumed that during this time untreated wastewater would be discharged into the river. After running the simulation, the resulting concentrations of DO, BOD5, and ammonia nitrogen were analyzed. The results showed that, according to the concentration values of the untreated wastewater, the concentrations of BOD5 and ammonia nitrogen rapidly increased and the DO concentrations rapidly decreased with the initiation of the WWTP failure. Immediately after the WWTP was repaired, the parameters returned to their pre-failure values. The resulting analysis of the effects of this scenario highlighted the self-purification ability of the Drava River

Water for all : Proceedings of the 7th international scientific and professional conference Water for all

The 7th International Scientific and Professional Conference Water for all is organized to honour the World Water Day by the Josip Juraj Strossmayer University of Osijek, European Hygienic Engineering & Design Group (EHEDG), Danube Parks, Croatian Food Agency, Croatian Water, Faculty of Food Technology Osijek, Faculty of Agriculture in Osijek, Faculty of Civil Engineering Osijek, Josip Juraj Strossmayer University of Osijek Department of Biology, Josip Juraj Strossmayer University of Osijek Department of Chemistry, Nature Park “Kopački rit”, Osijek- Baranja County, Public Health Institute of the Osijek- Baranja County and „Vodovod-Osijek“ -water supply company in Osijek. The topic of World Water Day 2017 was "Wastewater" emphasizing the importance and influence of wastewater treatments on global environment. The international scientific and professional conference Water for all is a gathering of scientists and experts in the field of water management, including chemists, biologists, civil and agriculture engineers, with a goal to remind people about the significance of fresh water and to promote an interdisciplinary approach and sustainability for fresh water resource management. The Conference has been held since 2011. About 300 scientists and engineers submitted 95 abstracts to the 7th International Scientific and Professional Conference Water for all, out of which 33 was presented orally and 62 as posters. 47 full papers were accepted by the Scientific Committee. 38 full papers became the part of the this Proceedings while 9 papers were accepted for publication in Croatian Journal of Food Science and Technology and Electronic Journal of the Faculty of Civil Engineering Osijek - e-GFOS

Social Media Communication Analysis Of The Selected Museums In Zagreb, Croatia

Cilj završnoga rada bio je analizirati komunikaciju odabranih muzeja na društvenim mrežama. Društvene mreže jedan su od najpopularnijih alata odnosa s javnošću te se nastojalo prikazati koliko uspješno ih kulturne institucije, odnosno muzeji, upotrebljavaju za komunikaciju s javnosti. U radu je dan teorijski prikaz ključnih pojmova kao što su odnosi s javnošću, digitalne komunikacije i društvene mreže. Također je dan pregled komunikacije muzeja na društvenim mrežama i digitalnoga utjecaja na komunikaciju. Najbitnije je istaknuti istraživački dio rada koji je proveden upotrebom kvantitativne metode analize sadržaja i kvalitativne metode strukturiranoga intervjua. Uzorak su bila tri zagrebačka muzeja – Muzej suvremene umjetnosti, Muzej za umjetnost i obrt te Nacionalni muzej moderne umjetnosti, a analizirane su objave na Facebooku i Instagramu od 1. siječnja do 31. ožujka 2021. godine. U strukturiranome intervjuu sudjelovali su čelni ljudi muzeja zaposleni u odjelima marketinga i odnosa s javnošću. Istraživanjem se htjelo saznati koliko se uspješno muzeji koriste društvenim mrežama za komunikaciju kroz formate objava, engagement korisnika i tematiku objava. Rezultati su pokazali da, iako su odabrani muzeji aktivni na Facebooku i Instagramu, engagement objava je slab zbog nedovoljnoga upravljanja publikom, niskih budžeta za oglašavanje, ali i činjenice da osobe koje vode društvene mreže nisu zaposlene samo na toj funkciji i radi te funkcije.The aim of this final paper is to analyse the social media communication of selected museums. Social media are some of the most popular public relation tools, and this research attempted to show how effectively it is used by the cultural institutions - museums in their communication with the public. A theoretical overview of key terminology is given, covering public relations, digital communication and social networks. Furthermore, this paper covers an overview of the museum’s communication on social media and its digital effect on communication. The emphasis is given to the research part of this thesis implementing a quantitative method of content analysis and qualitative method of structured in-depth interviews. The sample consists of three museums in the city of Zagreb – Museum of Contemporary Art, Museum of Arts and Craft, and National Museum of Modern Art, and the analysis covered Facebook and Instagram posts in the time period from 1st January to 31st March 2021. Structured in-depth interviews were conducted with the heads of the mentioned museums’ marketing and PR departments. This research aimed to find out how successful these museums utilize social networks to communicate through posts formats, user’s engagement and posts content. The results have shown that, even though the selected Museums are active on Facebook and Instagram, their posts engagement is low due to insufficient user management, low marketing budgets, but also the fact that the people running social media accounts do many other jobs as well

Social Media Communication Analysis Of The Selected Museums In Zagreb, Croatia

Cilj završnoga rada bio je analizirati komunikaciju odabranih muzeja na društvenim mrežama. Društvene mreže jedan su od najpopularnijih alata odnosa s javnošću te se nastojalo prikazati koliko uspješno ih kulturne institucije, odnosno muzeji, upotrebljavaju za komunikaciju s javnosti. U radu je dan teorijski prikaz ključnih pojmova kao što su odnosi s javnošću, digitalne komunikacije i društvene mreže. Također je dan pregled komunikacije muzeja na društvenim mrežama i digitalnoga utjecaja na komunikaciju. Najbitnije je istaknuti istraživački dio rada koji je proveden upotrebom kvantitativne metode analize sadržaja i kvalitativne metode strukturiranoga intervjua. Uzorak su bila tri zagrebačka muzeja – Muzej suvremene umjetnosti, Muzej za umjetnost i obrt te Nacionalni muzej moderne umjetnosti, a analizirane su objave na Facebooku i Instagramu od 1. siječnja do 31. ožujka 2021. godine. U strukturiranome intervjuu sudjelovali su čelni ljudi muzeja zaposleni u odjelima marketinga i odnosa s javnošću. Istraživanjem se htjelo saznati koliko se uspješno muzeji koriste društvenim mrežama za komunikaciju kroz formate objava, engagement korisnika i tematiku objava. Rezultati su pokazali da, iako su odabrani muzeji aktivni na Facebooku i Instagramu, engagement objava je slab zbog nedovoljnoga upravljanja publikom, niskih budžeta za oglašavanje, ali i činjenice da osobe koje vode društvene mreže nisu zaposlene samo na toj funkciji i radi te funkcije.The aim of this final paper is to analyse the social media communication of selected museums. Social media are some of the most popular public relation tools, and this research attempted to show how effectively it is used by the cultural institutions - museums in their communication with the public. A theoretical overview of key terminology is given, covering public relations, digital communication and social networks. Furthermore, this paper covers an overview of the museum’s communication on social media and its digital effect on communication. The emphasis is given to the research part of this thesis implementing a quantitative method of content analysis and qualitative method of structured in-depth interviews. The sample consists of three museums in the city of Zagreb – Museum of Contemporary Art, Museum of Arts and Craft, and National Museum of Modern Art, and the analysis covered Facebook and Instagram posts in the time period from 1st January to 31st March 2021. Structured in-depth interviews were conducted with the heads of the mentioned museums’ marketing and PR departments. This research aimed to find out how successful these museums utilize social networks to communicate through posts formats, user’s engagement and posts content. The results have shown that, even though the selected Museums are active on Facebook and Instagram, their posts engagement is low due to insufficient user management, low marketing budgets, but also the fact that the people running social media accounts do many other jobs as well

MATHEMATICAL MODELLING OF DRAVA RIVER SECTION 000+543 - 069+118 - WATER QUALITY

U programskom paketu MIKE 11 izrađen je jednodimenzionalni model rijeke Drave na dionici od 00+543 rkm do 69+118 rkm sa svrhom analize kakvoće vode rijeke Drave. Izrađena je pojednostavljena verzija promatrane dionice rijeke Drave bez pritoka. Za uzvodni rubni uvjet uneseni su protok i parametri kakvoće vode (otopljeni kisik, temperatura, amonijak, nitrati, otopljeni i partikularni fosfor te petodnevna biološka potrošnja kisika BPK5), na nizvodnom presjeku definiran je vodostaj dok je uvjet vezan za kakvoću vode ostao otvoren. Kao dio ulaznih podataka također su određene koncentracije spomenutih parametara kakvoće vode na uređaju za pročišćavanje Belišće na stacionaži 54+373 rkm i oni na položaju direktnog ispusta otpadne vode kod Osijeka sa stacionažom 14+580 rkm. Modelirana su dva scenarija. Za scenarij 1 uneseni su potoci i parametri kakvoće vode na pozicije tri prema dogovoru odabrana kišna preljeva (od ukupno osam u gradu Osijeku). Analizirano je kako otpadna voda, puštena preko preljeva za vrijeme kišnih razdoblja u trajanju od 30, 60, 120 i 240 minuta, a povratnim razdobljima od 1, 3, 5, 10 i 20 godina, utječe na kakvoću vode rijeke Drave. Scenarij 2 predstavlja ekstremnu situaciju: kvar na uređaju za pročišćavanje Belišće i njegov prestanak rada u trajanju od dva dana. Pretpostavljeno je da se tokom tog razdoblja u rijeku Dravu ispušta nepročišćena voda sa uređaja za pročišćavanje Belišće. Nakon modeliranja analizirane su dobivene koncentracije otopljenog kisika O2, BPK5, i amonijaka NH3. Za prvi scenarij konstruirane su ITP krivulje za svako povratno razdoblje. Rezultati su pokazali kako se koncentracije, nakon prvotnog pada/skoka, razmjerno brzo stabiliziraju na stanje prije kišne epizode. Scenarij 2 isto je ukazao na sposobnost samopročišćavanja rijeke Drave. Tokom kvara, koncentracije analiziranih parametara naglo su se povećale u skladu sa vrijednostima parametara nepročišćene vode, ali odmah po popravku uređaja također dolazi do vraćanja parametara na prvotnu kakvoću vode rijeke Drave. Diplomski rad napravljen je u suradnji sa Građevinskim fakultetom u Bratislavi u okviru Erasmus+ programa za mobilnost studenata.One-dimensional model of the Drava River between chainages 00+543 km and 69+118 km was created in 1D modelling software MIKE 11. Compared to the Drava River, the created model was simplified, without any tributaries, with the purpose of water quality analysis. Inflow boundary was specified upstream as well as water quality parameters (dissolved oxygen DO, temperature, ammonia, nitrates, dissolved and particular phosphorus and biochemical oxygen demand BOD). Water level and open boundary conditions were specified at the downstream end. Water quality parameters mentioned earlier were also defined at wastewater treatment plant (WWTP) Belišće (chainage 54+373 km) and wastewater outlet near Osijek (chainage 14+580 km) Two types of scenarios were modelled. For scenario 1, discharge and water quality parameters were specified for three combined sewer overflows (CSO) in Osijek. The purpose of this scenario was to analyse wastewater impact on the Drava River during the rainfall with the duration of 30, 60, 120 and 240 minutes and the frequency of 1, 3, 5, 10 and 20 years. Scenario 2 presented an extreme situation: 2-day failure of WWTP Belišće. It was assumed that during that time raw untreated water would be discharged into the river. After running the simulation, resulting concentrations of DO, BOD and ammonia were analysed. IDF curves were constructed for scenario 1. According to the results, concentrations of BOD and ammonia rapidly increase with the beginning of the rain but stabilize around concentration value close to primer river quality shortly after the rain stops. At the same time, DO concentrations rapidly decrease but stabilize too. As well as scenario 1, scenario 2 also pointed out the self-purification of the Drava River. During the failure, parameter concentrations promptly increased according to concentration values of untreated wastewater, but immediately after fixing WWTP they went back to pre-failure values. This Master’s Thesis was created in collaboration with Faculty of Civil Engineering at Slovak University of Technology in Bratislava during Erasmus+ Mobility Programme

Bioprospecting of Targeted Phenolic Compounds of <i>Dictyota dichotoma</i>, <i>Gongolaria barbata</i>, <i>Ericaria amentacea</i>, <i>Sargassum hornschuchii</i> and <i>Ellisolandia elongata</i> from the Adriatic Sea Extracted by Two Green Methods

The content of bioactive compounds in four brown and one red algae from the Adriatic Sea (Dictyota dichotoma, Gongolaria barbata, Ericaria amentacea, Sargassum hornschuchii and Ellisolandia elongata) is explored. The efficiency of two different extraction methods viz. ultrasound-assisted extraction (UAE) and matrix solid-phase dispersion (MSPD) to obtain the extracts rich in phenolic compounds was compared. The effect of the extraction solvent to modulate the phenolic profile was assessed. In general, the mixture ethanol/water in an isovolumetric proportion showed the best results. The total phenolic content (TPC) and antioxidant activity (AA), as well as the individual polyphenolic profile, were evaluated for five target algae. TPC values ranged between 0.2 mg GAE/g (for E. elongata) and 38 mg GAE/g (for S. hornschuchii). Regarding the quantification of individual polyphenols by liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis, the presence of a high number of hydroxybenzoic acid derivatives (mainly of 3- and 4-hydroxybenzoic acids) in all species was noted. In G. barbata their concentrations reached up to 500 mg/kg. IC50 values (ABTS assay) ranged between 44 mg/L (for S. hornschuchii) and 11,040 mg/L (for E. elongata). This work contributes to the in-depth characterization of these little-explored algae, showing their potential as a natural source of phenolic compounds

Bioprospecting of Targeted Phenolic Compounds of Dictyota dichotoma, Gongolaria barbata, Ericaria amentacea, Sargassum&nbsp;hornschuchii and Ellisolandia elongata from the Adriatic Sea Extracted by Two Green Methods

The content of bioactive compounds in four brown and one red algae from the Adriatic Sea (Dictyota dichotoma, Gongolaria barbata, Ericaria amentacea, Sargassum hornschuchii and Ellisolandia elongata) is explored. The efficiency of two different extraction methods viz. ultrasound-assisted extraction (UAE) and matrix solid-phase dispersion (MSPD) to obtain the extracts rich in phenolic compounds was compared. The effect of the extraction solvent to modulate the phenolic profile was assessed. In general, the mixture ethanol/water in an isovolumetric proportion showed the best results. The total phenolic content (TPC) and antioxidant activity (AA), as well as the individual polyphenolic profile, were evaluated for five target algae. TPC values ranged between 0.2 mg GAE/g (for E. elongata) and 38 mg GAE/g (for S. hornschuchii). Regarding the quantification of individual polyphenols by liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis, the presence of a high number of hydroxybenzoic acid derivatives (mainly of 3- and 4-hydroxybenzoic acids) in all species was noted. In G. barbata their concentrations reached up to 500 mg/kg. IC50 values (ABTS assay) ranged between 44 mg/L (for S. hornschuchii) and 11,040 mg/L (for E. elongata). This work contributes to the in-depth characterization of these little-explored algae, showing their potential as a natural source of phenolic compounds