Određivanje ukupnih koliforma i Escherichie coli u vodi za ljudsku potrošnju

master's thesis

• Title (english): Determination of total coliforms and Escherichia coli in drinking water
• Author: Lucija Slunjski
• Mentor: Anita Ptiček Siročić (mentor)
• Committee member: Igor Petrović (predsjednik povjerenstva)
• Committee member: Anita Ptiček Siročić (član povjerenstva)
• Committee member: Nikola Sakač (član povjerenstva)
• Committee member: Sanja Kovač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Geotechnical Engineering; Varaždin
• Defense date and country: 2020-09-21, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Interdisciplinary Technical Sciences; Environmental Engineering

Abstract

Dovoljne količine vode od iznimne su važnosti za normalan razvitak stanovništva.
Usprkos tome, većina ljudske populacije još uvijek nema pristup zdravstveno ispravnoj
vodi za piće koja ne sadrži mikroorganizme, parazite ili druge štetne tvari opasne po
ljudsko zdravlje. Glavni pokazatelji zdravstvene ispravnosti vode za piće su stopa
onečišćenja vode fekalijama i štetnim kemijskim spojevima te prisutnost neugodnog
mirisa, boje i okusa. Iako je poznato da E. coli i crijevni enterokoki sačinjavaju
normalnu mikrofloru probavnog sustava sisavaca, ukoliko navedeni mikroorganizmi
dospiju u vodene ekosustave tamo postaju indikatori fekalnog zagađenja vode za
ljudsku potrošnju. Kako bi se utvrdilo je li voda ispravna za ljudsku potrošnju, provode
se mikrobiološka ispitivanja kojima se određuje broj ukupnih koliformnih bakterija i
Escherichie coli. U radu je provedena analiza mikrobioloških pokazatelja kakvoće vode
za piće na području Varaždinske županije (2 javna i 19 lokalnih vodovoda) tijekom
2019. i 2020. godine. Budući da bi voda za piće trebala imati manji postotak
bakterijskih kolonija fekalnog porijekla, mikrobiološki pokazatelji određeni su
metodom membranske filtracije, a rezultati ispitivanja prikazani su kao broj izraslih
kolonija u 100 ml uzorka. Dobiveni rezultati upućuju da ukupna količina bakterija
najčešće ovisi o meteorološkim uvjetima te onečišćenju okolnog tla, a analizirana voda
za ljudsku potrošnju je zadovoljavajuće kvalitete.

Abstract (english)

Sufficient amounts of water are extremely important for the normal development of
population. Despite this, the majority of the world still does not have the access to safe
drinking water that does not contain microorganisms, parasites or other harmful
substances. The main indicator of the safety of drinking water is the amount of pollution
caused by faeces and harmful chemicals, and well as the presence of unpleasant odours,
colours and taste.
In order to determine that water is suitable for consumption, microbiological tests which
quantify the total coliform bacteria and Escherichia coli are performed. The paper
analyses these microbiological indicators in 2 public and 19 local water supply systems
in Varaždin County during 2019 and 2020. Although E. coli and intestinal enterococci
are known to constitute the normal microflora of a mammalian digestive system, if
these microorganisms enter aquatic ecosystems, they become indicators of faecal water
pollution.
Since drinking water should have a lower percentage of bacterial colonies of faecal
origin, microbiological parameters were determined by a membrane filtration method,
and test results were presented as the number of colonies grown in 100 ml of a sample.
The obtained results show that the total amount of bacteria depended on meteorological
conditions and the pollution of a surrounding soil.

• Keywords: kakvoća vode; voda za ljudsku potrošnju; mikrobiološki pokazatelji; ukupni koliformi; Escherichia coli
• Keywords (english): water quality; water for human consumption; microbiological indicators; total coliforms; Escherichia coli
• Language: croatian
• URN:NBN: urn:nbn:hr:130:067135
• Study programme: Title: Geoenvironmental Engineering; specializations in: Geoenvironmental Engineering, Environmental Management, Water Management; Course: Geoenvironmental Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/ inženjerka inženjerstva okoliša (magistar/magistra inženjer/ inženjerka inženjerstva okoliša)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2020-10-12 07:24:43