Bacterioplankton dynamics in the well system of water supply Vinogradi near Osijek

Kelemen, Vanja (2015) Bacterioplankton dynamics in the well system of water supply Vinogradi near Osijek. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Microorganisms are very sensitive to the changes in their environment, what makes them good bioindicators. Changes in the ratio of the number of oligotrophic (bacteria that grow in an environment with low concentration of organic matter) and eutrophic bacteria (found in water rich in organic matter) can indicate the status of an aquatic ecosystem. Based on the bacteriological analysis of sanitary water quality we can now evaluate hygienic suitability of drinking water. The pumping station Vinogradi is located west of the city of Osijek, it includes 18 wells and there is a continuous monitoring of the water quality and health safety. Samplings were conducted in the spring of 2013 and 2015 and the results were compared to the results of previous samplings, in five-year intervals, from the period 1995 to 2010. The higher number of colonies of oligotrophic bacteria than eutrophic bacteria indicates a low concentration of organic matter in the water. Differences of the colony development dynamics between research years were established, and during the year 2000, in the B-6 well, the oligotrophs/eutrophs ratio was only 0,51. Recorded CFU values were never higher than 100 CFU per 1 ml, what indicates good quality of the water. Low oxygen concentrations, below 1,5 mg/l, were expected since water sources are below ground. Unfortunately, recorded concentrations of iron, manganese and ammonium ion were higher than the maximum concentration allowed by the Ordinance on sanitary quality of drinking water, what could be a consequence of the soil type. The water in the water supply of the city of Osijek is sanitary correct and suitable for human consumption.

Item Type: Thesis (Diploma thesis)
Keywords: oligotrophic bacteria, eutrophic bacteria, peptone, wells, water supply
Supervisor: Čerba, Dubravka
Co-supervisor: Hrenović, Jasna
Date: 2015
Number of Pages: 40
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 03 Mar 2016 11:41
Last Modified: 03 Mar 2016 11:41
URI: http://digre.pmf.unizg.hr/id/eprint/4529

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