Josip Juraj Strossmayer University of Osijek. Department of biology.
Abstract
Voda čovjeku predstavlja osnovi resurs za preživljavanje. Industrijalizacija i povećanje ljudske populacije
dovodi do onečišćenja i prekomjernog iskorištavanja, a klimatske promjene sve više smanjuju dostupnost i
kvalitetu vode. Kako bi voda za piće bila zdravstveno ispravna, prolazi kroz pogon za obradu sirove vode te se
njezina kvaliteta mora svakodnevno kontrolirati. Kako bi se ustanovila zdravstvena ispravnost vode za piće na
području Osječko-baranjske županije, u uzorcima vode s 6 lokacija analizirani su parametri: aerobne mezofilne
bakterije inkubirane pri 36 °C i 22 °C, bakterija Escherichia coli, slobodni klor, temperatura, pH, mutnoća i
boja. S ciljem usporedbe kvalitete vode obzirom na razdoblje godine, analize su provedene u zimskom i ljetnom
periodu 2019. godine. Testirane lokacije bile su različito udaljene od pogona za preradu sirove vode, kako bi
se ispitala moguća lošija kvaliteta na udaljenijim lokacijama. Rezultati pokazuju da je voda na istraživanom
području bila zdravstveno ispravna, ali lošije kvalitete tijekom ljetnog perioda. Obzirom na udaljenost od
pogona za preradu sirove vode, značajna razlika ustanovljena je analizom slobodnog klora što predstavlja veći
rizik za razvoj bakterija u vodi.Water is a basic resource for human survival. Industrialization and the increase of the human population are
leading to pollution and overexploitation, and climate change is significantly affecting the availability and
quality of water. Drinking water safety is insured by raw water processing in water treatment plants and its
quality must be checked daily. In order to test the health safety of drinking water in Osijek-Baranja County,
water samples were collected from 6 locations and following parameters were analyzed: aerobic mesophilic
bacteria incubated at 36 ° C and 22 ° C, Escherichia coli, free chlorine, temperature, pH, turbidity, and colour.
Study was conducted during winter and summer of 2019 allowing assessment of the water quality depending
on the period of the year. Locations near and far from raw water treatment plant were selected, in order to
determine possibility of poor water quality at more distant locations. The results indicate health safety of
drinking water in the tested area, but slight deterioration of water quality was observed during the summer
period. Given the distance from the raw water treatment plant, a significant difference in concentration of free
chlorine was found which poses a higher risk for the development of bacteria in the water at more distant
locations
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