Provider: - Institution: Josip Juraj Strossmayer University of Osijek. FACULTY OF FOOD TECHNOLOGY. Department of Applied Chemistry and Ecology. Sub-department of Chemistry and Ecology. - Data ...provided by Europeana Collections- 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.- 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.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Cilj ovog rada je definiranje biološkog modela sanitarne kakvoće stanja mora u Kvarnerskom zaljevu s posebnim naglaskom na priobalno ...more grada Rijeke gdje se nalazi komunalni ispust (onečišćivač) i plaže za kupanje i rekreaciju, te računalna simulacija gibanja mora, advekcije i difuzije spregnute s kemijskim reakcijama fekalnih koliforma i fekalnih streptokoka te otopljenog kisika. Za kompjutorsku simulaciju korišten je softver MIKE3 danskog hidrološkog instituta. Period simulacije obuhvaća 36 sati od početka ispusta oblaka onečišćenja, što je dovoljan period za dostatno razrjeđenje koncentracije bakterija. Za spektar vjetrova iz svih osam smjerova tipičnih za Kvarnerski zaljev, te dva različita intenziteta, umjeren i orkanski, forsirano je gibanje morskih masa s realnim rubnim i početnim uvjetima preuzetim iz meteoroloških izvješća i mjernih postaja, uz istovremeno ispuštanje kanalizacijskih voda. Postignuta je mrežna konvergencija, te je zaključeno da treba raditi s dvije mreže: grubom, za područje cijelog zaljeva i finijom za sjeverni dio zaljeva oko ispusta Delta i grada Rijeke.
Kod svih vjetrova oblak kritičnog onečišćenja fekalnih koliforma granične koncentracije od 100 bakterija po 100 ml mora se kreće uglavnom u smjeru paralelnom s obalom i to ili u smjeru istoka ili zapada, ne izlazi na površinu mora, ostaje negdje na dubini od 10 do 20 m ispod površine. To je rezultat strujnog polja gibanja masa Kvarnerskog zaljeva , koje pri buri ima svojstvo da se topli površinski sloj mora istiskuje iz zaljeva kroz Mala i Vela vrata, dok donji hladni slojevi ulaze u zaljev. Pri tome je prosječna vertikalna komponenta brzine uz obalu oko 1 mm s-1, dovoljna da nakon 3 sata podigne hladnu vodu uz sjevernu obalu Kvarnerskog zaljeva za 10 m i značajno rashladi površinski priobalni sloj.
Osnovni je zaključak da je gradski kanalizacijski ispust Delta dobro projektiran i izveden, te su sva sanitarna onečišćenja unutar zakonom i pravilnicima ograničenih vrijednosti. Ispust je dovoljno udaljen od obale da zalazi u dijelove zaljeva gdje su lokalne struje uglavnom u smjeru paralelnom s obalom te se oblak onečišćenja ne približava zonama za kupanje i rekreaciju. Čak i ako se poveća protok ispusta za 50% onečišćenja će i dalje biti unutar dozvoljenih granica.- The goal of this work is the definition of water quality model of Rijeka bay sea, with special emphasis on coastal sea of city of Rijeka where sewage disposal site and recreation and swimming area are situated, as well as computer simulation of the sea motion with advection and diffusion coupled by chemical reactions of fecal coliforms, fecal streptococci and dissolved oxygen. Danish hydrodynamic Institute software MIKE3 is used for computer simulation. The simulation period is 36 hours following the discharge of the pollution plume, which period is sufficient for significant extinction of bacteria. For the wind spectra typical for Rijeka bay, and for two intensities, moderate and high, the forcing of sea flow with real boundary and initial conditions taken from meteorological predictions and measurements and sewage discharge were simulated. Mesh convergence has been obtained, with the conclusion that it is sufficient to work with two mesh sizes: coarse, for the whole bay and fine, for the north part of the bay close to sewage discharge and city of Rijeka.
For all winds, the pollution plume with the concentration more than 100 fecal coliforms and 100 fecal streptococci per 100 ml of water, is conveyed mostly parallel to the coast in direction east or west, it does not rise to surface but stays at 10 to 20 meters below the surface. This is the result of the sea motion of Rijeka bay: bora wind conveys surface water layer out of bay through Small and Big doors while deep cold layers of water enter the bay. Mean vertical velocity component close to coast is about 1 mms-1 high enough to rise cold water in 3 hours and significantly cools surface coastal sea.
Main conclusion is that the sewage discharge Delta is well designed and constructed and all sanitary pollution are within regulatory given boundaries. The discharge site is far enough from the coast where local streams are mostly parallel to coast and the pollution plume does not come close to swimming and recreational areas. Even if discharge is increased 50% the pollution will be within regulatory given boundaries.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- U radu je prikazan razvoj modela složenih, inženjerskih sustava u zaštiti okoliša, na način da su izgrađeni modeli dva stvarna, ...složena, inženjerska sustava za pročišćavanje vode (otpadne vode Grada Čakovca te površinske vode rijeke Drave u Gradu Belišću). Pomoću ova dva modela razvijen je adaptivni model sustava pročišćavanja vode koja po kvaliteti odgovara otpadnoj komunalnoj vodi, a pročišćuje se u vodu koja po kvaliteti odgovara vodi za ljudsku potrošnju. Predviđena su mjesta potpunog zastoja sustava koji može izazvati materijalne štete, štete u okolišu te utjecati na zdravlje ljudi.- This paper presents the development of complex engineering system models in the environmental protection field of study. For this purpose, the two models of genuine complex engineering systems have been created. Explicitly, these are two water purification systems whereas in one, the municipal waste water from Cakovec has been used and in the other, surface water from the Drava river in Belisce.The two models enabled the development of the adaptive water purification system model, which improves the quality of municipal wastewater and makes it suitable for public consumption. Additionally, the total adaptive system deadlocks, which may cause material or environmental damage and even affect human health, have been predicted.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: Josip Juraj Strossmayer University of Osijek. FACULTY OF FOOD TECHNOLOGY. Department of Applied Chemistry and Ecology. Sub-department of Chemistry and Ecology. - Data ...provided by Europeana Collections- Fentonov proces s heterogenim katalizatorom primijenjen je za razgradnju prirodnih organskih tvari iz
dva izvora: standardne otopine huminske kiseline i prirodne podzemne vode osjeckog podrucja. U tu
su svrhu pripremljeni željezovi katalizatori na nosacu i to impregnacijom razlicitih oblika željeza
(Fe(III), Fe(II), FeOOH) na bazni materijal. Kao nosaci su ispitani: prirodni zeolit klinoptilolit i dvije
komercijalne vrste aktivnog ugljena, Hidraffyn 30N i Silcarbon K835. Cilj istraživanja je bio ispitati
ucinkovitost heterogenih Fentonovih procesa i usporediti ih s odgovarajucim homogenim Fentonovim
procesom te utvrditi utjecaj najvažnijih parametara procesa (koncentracije katalizatora, koncentracije
H2O2, pH). Kada se proces odvijao u optimalnim uvjetima, homogeni katalizator se pokazao nešto
ucinkovitijim u usporedbi s odgovarajucim procesom uz upotrebu heterogenog katalizatora.
Udaljavanjem uvjeta od optimalnih, ucinkovitost homogenog procesa naglo opada, dok je ucinkovitost
heterogenih procesa konstantnija i procesi su manje osjetljivi na promjenu procesnih parametara te u
tim uvjetima heterogeni procesi daju slicne ili cak bolje rezultate.- An application of heterogeneous Fenton-type catalyst was investigated for the degradation of natural
organic matter from two sources: model humic acid solution and natural groundwater from town Osijek
area. For this purpose, supported iron catalysts were prepared by impregnation of different iron forms
(Fe(III), Fe(II), FeOOH) on support materials. Different supports were evaluated: natural zeolite
clinoptilolite and two commercial types of activated carbon, Hidraffyn 30N and Silcarbon K835. The
aim of this study was to investigate the performance of heterogeneous Fenton processes and
compare them with the corresponding homogenous Fenton process. The effect of the most relevant
operating conditions (catalyst concentration, H2O2 concentration, pH) was estimated. When process
was conducted in optimal conditions, homogeneous catalyst showed slightly higher efficiency when
compared to the corresponding processes applying heterogeneous catalyst. Moving away from
optimal conditions, the effectiveness of homogeneous processes was rapidly decreased, while the
efficiency of heterogeneous processes was more constant and processes were less sensitive to the
change of process parameters and in these conditions the heterogeneous processes gave similar or
even better results.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: Josip Juraj Strossmayer University of Osijek. FACULTY OF FOOD TECHNOLOGY. Department of Applied Chemistry and Ecology. Sub-department of Chemistry and Ecology. - Data ...provided by Europeana Collections- Cilj ovog rada bio je izvršiti ocjenu kvalitete i klasifikaciju podzemnih i površinskih voda Brčko distrikta BiH na temelju mjerenja odabranih pokazatelja, izračunatih koeficijenata i indeksa kvalitete vode. Uzorci su prikupljani na 92 izvora podzemnih voda tijekom petogodišnjeg perioda (2004.–2008.) i na tri mjerna profila na rijekama Savi, Tinji i Brki tijekom dvije godine (2008.–2009.). Dobiveni su rezultati pokazali da kvaliteta podzemnih voda Brčko distrikta BiH u 83,7 % slučajeva zadovoljava uvjete koji su preporučeni standardom WHO-a, te da su sadržaji mangana, željeza, amonijaka i ukupna tvrdoća bili veći od dozvoljenih. Na osnovi se utvrđenih vrijednosti SAR-a i RSC-a vode s područja jugoistočnog i centralnog dijela Brčko distrikta BiH mogu sigurno i bez ograničenja koristiti za navodnjavanje, dok vode u sjeverozapadnom dijelu imaju umjerenu kvalitetu za navodnjavanje, pa treba voditi računa kod uzgoja pojedinih biljaka. Osim toga, utvrđene vrijednosti LSI, RSI i PSI pokazuju da se sve podzemne vode ove regije nalaze u području stabilnih voda i mogu se sigurno koristiti u industrijske namjene. Rezultati multivarijantne analize pokazali su grupiranje svih izvora podzemnih voda u deset klastera koji su i prirodno povezani. Nadalje, u ovom radu su izračunata tri već razvijena indeksa kvalitete vode. Osim toga, na temelju rezultata faktorske analize (multivarijantne analize) modificiran je WQIIN te razvijen indeks kvalitete za podzemne i površinske vode Brčko distrikta BiH, WQIB, s ciljem utvrđivanja mjesta s najboljom kvalitetom vode za piće u navedenoj regiji. Metodologija je zasnovana na definiciji WQI, dok su pri izračunu korištene prosječne vrijednosti 11 pokazatelja: pH, UT, TDS, F, Cl, NH4, SO4, HCO3, SAR, Fe i Mn ispitivanih voda. I na kraju, izrađena karta s vrijednostima WQIB pruža cjelovitu sliku za lakše tumačenje i donošenje odluka u boljem planiranju i upravljanju vodnim resursima. Razvijeni WQIB pokazao se kao jednostavan i pouzdan indeks koji se može brzo i uspješno primijeniti u ocjeni podzemnih i površinskih voda Brčko distrikta BiH, te ima prednost pred ostalim indeksima jer bolje ističe nepovoljne utjecaje na kvalitetu vode, što bi značilo da je ocjena stroža. Iz toga se može zaključiti da je provedena modifikacija bila opravdana.- The aim of this study was to evaluate the quality of ground and surface water resources in Brčko Distrikt of Bosnia and Herzegowina and classify them according to selected parameters, coefficients and water quality indices. The samples were collected from 92 groundwater sources during the period of five years (2004 – 2008) and three measurement profiles of the Sava River and its tributaries, Tinja and Brka, in this region during 2008 and 2009. The results showed that 83.7% of groundwater quality parameters were in accordance with the recommended WHO standard. The content of manganese, iron, ammonia and total hardness were higher than allowed. Furthermore, the SAR and RSC results clearly showed that the water from the south-eastern and central parts of of Brčko District of Bosnia and Herzegovina can be used for irrigation without any restriction, while water in the north-western part of this region with a moderate quality for irrigation should be taken into account in growing some kinds of plants. In addition, the obtained LSI, RSI, and PSI values demonstrate that all groundwaters in this region are stable and safe for industrial purposes. According to the results of multivariate analysis, all groundwater sources were divided in ten clusters that are naturally associated. Furthermore, the present work is aimed to assess the water quality index for investigated water according to WQINSF, WQIIR and WQIIN. Moreover, based on the results of factor analysis (multivariate analysis) WQIIN has been modified and a new index of quality for ground and surface water from Brčko Distrikt of Bosnia and Herzegowina, WQIB, was developed with the aim to determine the place with the best drinking water quality in the specified region. For calculating the WQIB, the following 11 parameters have been considered: pH, total hardness, TDS, F, Cl, NH4, SO4, HCO3, SAR, Fe and Mn. And finally, the map with WQIB values provides a comprehensive picture for easier interpretation and decision making in better planning and management of water resources. The developed WQIB proved to be a simple and reliable index that can be quickly and successfully applied on the assessment of ground and surface water from Brčko Distrikt of Bosnia and Herzegowina. This index has an advantage over the other because it can better highlight the adverse effects on water quality and it has a stricter rating. It can be concluded that the modification carried out was justified.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: Josip Juraj Strossmayer University of Osijek. FACULTY OF FOOD TECHNOLOGY. Department of Applied Chemistry and Ecology. Sub-department of Chemistry and Ecology. - Data ...provided by Europeana Collections- Podzemne vode glavni su izvor vode za piće za populaciju istočne Hrvatske, a nedavno objavljeni rezultati
istraživanja upotvrdili su prisutnost anorganskih spojeva arsena u većini vodonosnika istočne Hrvatske u
koncentracijama iznad 10 μg L-1. U radu ispitana je mogućnost adsorpcije arsenovih aniona iz modelnih otopina i
aerirane podzemne vode na različite adsorpcijske materijale: biosorbense – natrijeva alginata i karboksimetil
celuloze, zeolite –klinoptilolita iz dva ležišta - Vranjska Banja i Donje Jesenje, te na dvije vrste aktivnog ugljena -
Hydraffyn 30N i Silcarbon K 835. Svi navedeni adsorpcijski materijali su prije ispitivanja funkcionalizirani
zasićenjem površine Fe(III) ionima, a potom je ispitan utjecaj glavnih čimbenika učinkovitosti adsorpcije : početne
koncentracije arsena, vremena adsorpcije, pH-vrijednosti i temperature na adsorpcijske kapacitete navedenih
materijala. Mjerenjem masene koncentracije prije i nakon primjene navedenih sorpcijskih materijala, određen je
učinak pojedinog adsorbensa pri uklanjanju arsena iz navedenih otopina, a dobiveni podaci su obrađeni
matematičkim modelima Freundlichove i Langmuirove adsorpcijske izoterme. Utjecaj temperature na učinak
adsorpcije arsena ispitan je promjenom temperature medija u rasponu od 25 °C do 45 °C. Rezultati istraživanj su
pokazali da je adsorpcijski kapacitet ispitanih adsorbensa u obrnuto proporcionalnoj ovisnosti sa koncentracijom
arsena u otopini, dok je pozitivan učinak na adsorpcijski kapacitet imalo sniženje pH-vrijednosti. Povećanje
temperature otopina negativno se odrazilo na učinak adsorpcije na biopolimere, a pozitivno na adsorpciju arsena
na zeolitne adsorbense i aktivne ugljene- Groundwater is the main source of drinking water in eastern Croatia and the population of nearly
200,000 people daily drinking water with arsenic concentration over the 10 μg L-1. The removal of arsenic anions
from aqueous solutions and groundwater using the sorbents: biosorbents, zeolites and activated carbons were
investigated. All adsorbents were functionalized with ferric ions before examination using different methods of
modification. The influence of experimental parameters variations, including initial As(V) concentration,
adsorption time, pH and temperature were examined using standard solutions of As(V) and aerated groundwater
of the Osijek area. The influence of each parameter was determined, and obtained data were fitted by Freundlich
and Langmuir isotherm models. Thermodynamic parameters for the adsorption systems were determined at
25°C, 35°C and 45°C. Obtained adsorption models points out that the adsorption capacity decreased by increasing
the As(V) ions concentration and pH value, while longer time contact between arsenic and adsorbent increased
efficiency of arsenic removal. Finally, one of the main goals of this study was determination of temperature
influence on adsorption system, and experimental results showed that, in the case of zeolites and two types of
commercially available activated carbons, the increase of adsorption capacity with temperature appears to be
related to a higher arsenic dissociation, while biopolymeric adsorbents showed strong decrease of adsorption
capacity with temperature increasing.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- U radu je izvršena numerička i eksperimentalna analiza parametara toplinske ugodnosti
uredskoga prostora klimatiziranog istovremenim ...radom dvaju podstropnih, paralelnih
terminalnih uređaja. Pri njihovu istovremenom pogonu može doći do međudjelovanja
proizvedenih turbulentnih površinskih mlazova i nastanka složenih strujanja, koja utječu na
ugodnost boravka u prostoru. S ciljem matematičkoga opisa značajki mlazova, metodom laser-
Doppler-anemometriranja (LDA) izvršen je čitav niz pokusnih mjerenja. Istraženi su profili
brzina u mlazovima, opadanje maksimalne brzine i druge značajke, za tri različite međusobne
udaljenosti terminalnih uređaja i za tri brzine vrtnje ventilatora.
Za svih devet analiziranih slučajeva, u drugoj fazi eksperimentalnih mjerenja utvrđena je
raspodjela temperaturnih i polja brzina unutar zone boravka u prostoru, te je uporabom PMVPPD
modela ocijenjena razina toplinske ugodnosti.
Sva su mjerenja odrađena u Laboratoriju za toplinsku ugodnost na Tehničkom fakultetu
Sveučilišta u Rijeci, u kojem je pripremljen model uredskoga prostora s jednim vanjskim zidom,
okružen jednako klimatiziranim prostorijama.
U nastavku rada postavljen je matematički model trodimenzijskoga vremenski ustaljena strujanja
zraka i izmjene topline u promatranome uredskom prostoru. Model je riješen numeričkom
metodom kontrolnih volumena, uporabom komercijalna računalnog CFD programa FLUENT.
Razvijeni numerički model vrednovan je usporedbom s eksperimentalnim mjerenjima. Ta je
usporedba pokazala dobro podudaranje rezultata, te dokazala opravdanost primjene modela kod
procjenjivanja toplinske ugodnosti sličnih prostora.- A numerical and experimental analysis of thermal comfort in an open – plan office has been
carried out in the thesis. The office is air-conditioned by two parallel ceiling air terminal devices
(ATDs). During simultaneous operation of the ATDs, an interaction of produced turbulent wall
jets can occur resulting in complex airflow patterns within the room that influence on the
achievable level of thermal comfort. With the aim of mathematical description of the jet
characteristics, a set of experimental measurements was performed using laser-Doppleranemometer
(LDA) method. Velocity profiles in the jets, axial velocity decays and other relevant
jet characteristics were investigated for three different distances between the ATDs and three fan
speeds.
For all 9 cases, in the second phase of the experimental measurements, temperature and velocity
fields within the occupation zone were determined and thermal comfort evaluated using the
PMV-PPD model.
All the measurements were performed in a test room representing an open-plan office having one
external wall and surrounded by equally conditioned spaces. The test room is situated in the
Laboratory of Thermal Comfort at the Faculty of Engineering University of Rijeka.
A three-dimensional steady-state mathematical model of the fluid flow and heat transfer problem
was the base for development of a numerical tool for the assessment of thermal comfort. The
model was solved using CFD software FLUENT, based on the control volume method.
Comparison of the results showed a good agreement between the numerical simulations and
experimental measurements.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Rad analizira djelovanje na okoliš komunalnog gospodarenja vodom i otpadom. Daje se
pregled stanja komunalne djelatnosti, raspravlja ...primjenjivost nacela onecišcivac placa,
navode razlozi opstajanja rješenja na kraju cijevi, te se iznose moguca tehnicka rješenja za
komunalno gospodarenje odnosno komunalnu infrastrukturu s posebnim naglaskom na manja
naselja. Analizira se ekološko zakonodavstvo Europske unije koje se odnosi na komunalni
sektor. Pružaju se podaci za komunalno gospodarenje u Republici Hrvatskoj u pogledu
upravljanja vodama, gospodarenja otpadom i ulaganja u zaštitu okoliša. Opisuju se iskustva sa
inozemnim partnerima u izgradnji komunalne infrastrukture u Hrvatskoj, pravna pomoc i
sudska praksa, te stavovi Europske unije i Svjetske banke. Temeljem intervjua i objavljenih
podataka se iznose stavovi dionika o okolišu. Daje se istraživanje modela upravljanja zaštitom
okoliša utemeljen na komunalnom gospodarenju otpadom i vodom, uz sadržaj upitnika, te
analizu i ocjenu dobivenih rezultata. Autor navodi prijedlog modela upravljanja zaštitom
okoliša utemeljen na komunalnom gospodarenju otpadom i vodom, a koji je razraden na nacin
da pruža pregled postojeceg stanja, navodi kljucne probleme, izazove, moguca tehnicka,
zakonodavna, institucionalna i obrazovna rješenja, te konkretne mjere.- Thesis analyses the impact of water and waste utility service management on the
environment. It presents the state of utilities sector, discusses the applicability of the polluter
pays principle, states the reasons of perseverance of end of the pipe systems, and
contemplates the feasible technical solutions for utilities management or the communal
infrastructure with particular emphasis on smaller communities. Environmental legislation of
the European Union relevant for the utilities sector is analysed. The data concerning utilities
management in the Republic of Croatia are provided regarding water management, solid
waste management and investment in environmental protection. The experiences with foreign
partners in constructing communal infrastructure in Croatia, legal aid and case law are
reported on, as well as the stances of the European Union and of the World Bank. On the
basis of interviews and published data, the stances by shareholders on the environment are
presented. Research is presented of the environmental protection model based on waste and
water utility management together with contents of the questionnaire, as well as the analysis
and evaluation of the results obtained. The author puts forward proposal of the environmental
management model based on the waste and water utility management, which is elaborated so
as to provide the review of present state, specify major problems, challenges, possible
technical, regulatory, institutional and educational solutions, as well as concrete measures.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: Josip Juraj Strossmayer University of Osijek. FACULTY OF FOOD TECHNOLOGY. Department of Applied Chemistry and Ecology. Sub-department of Chemistry and Ecology. - Data ...provided by Europeana Collections- Monitoringom kakvoće podzemne vode crpilišta osječkog vodovoda, polučio se uvid u kakvoću vode izvorišta u opsegu dubine 30-180 m. Tijekom vremena kakvoća podzemne, nepreradene vode u fizičko-kemijskom i mikrobiološkom pogledu značajnije se ne mijenja, te je njen sastav uzrokovan geološkim uvjetima vodonosnika.
U ovom radu provedena je karakterizacija pojavnih oblika arsena As(III), As(V) na određenim dubinama vodonosnih slojeva. Arsen na crpilištu Vinogradi uglavnom je u obliku As (III) i iznosi oko 96 % količine ukupnog arsena. Određivanje koncentracije
ukupnog arsena i As (III) provedeno je anodnom striping voltametrijskom tehnikom (ASV) s bočno postavljenom zlatnom elektrodom.
Obzirom da je As (III) oblik vrlo toksičan i izuzetno ga je teško ukloniti predmet ovog istraživanja je utvrđivanje uspješnosti različitih oksidacijskih sredstava (vodik-peroksid, kalij permanganat, ozon) za oksidaciju arsenita, uz optimalne pH vrijednosti, kontaktno vrijeme, kao i racionalno optimizirano doziranje nužnih kemikalija za izdvajanje arsena.
Ovim radom nastojalo se pridonijeti dugoročnom unaprjeđenju kakvoće pitke vode u Osječko-baranjskoj županiji. Istraživanje koje je tema ove disertacije posebno je aktualno u zadnje vrijeme, budući da je koncentraciju arsena u pitkoj nužno dovesti u granice koje zahtijeva EU.- By monitoring the quality of underground water in the area of waterintake for the city
Osijek, the insight into the quality of water source in the range of depth 30-180 m was
obtained. During the time, the quality of groundwater in the physico-chemical and
microbiological respect, does not have significant changes, so that its composition is
caused by geological conditions of aquifer .
In this work, the characterisation of arsenic appearance shapes As (III), As (V) in the
certain depths of water-carrieng soil layers, was carried out. Arsenic in water intake area
Vinogradi is mainly in the form of As (III) and makes about 96% of arsenic total amount.
Determination of the concentration of total arsenic and arsenic (III) have been carried out
by anodic stripping voltametric technique (ASV) with the gold electrode, set sideways.
Regarding that the As (III) form is very toxic and that it is extremely difficult to remove it,
the subject of this research is determining the efficiency of different oxidated agents
(hydrogen-peroxide, potassium permanganate, ozone) for oxidation of As (III) , at optimal
pH, contact time, as well as determining the rational optimized dosage of chemicals,
needed to extract arsenic.
The intention of this work was to contribute to the long-term improvement of the drinking
water quality in the Osijek-Baranja County. The research, that is subject of this
dissertation, is particularly actual lately, because it is necessary to get the concentration of
arsenic in drinking water into the limits required by the EU.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
