The Quality of Water From Artesian Drinking Fountains in the City of Zaječar - page 04

 

02
Figure 2: The values of concentration of Fe (mg/L) that conflict with the Regulations on the hygienic quality of drinking water for (42/98 and 44/99) in certain artesian fountains.

 

03
Figure 3: The drains of fountains No. 11 (a), 12 (b) and 20 (c), characteristically rust-colored.

 

In the experimental periods during 2013 and 2014 in terms of bacteriological safety, in some water samples, aerobic mesophilic bacteria, and in only one sample total coliform bacteria were detected (data not shown). Fecal indicator bacteria like total coliforms, fecal coliforms and intestinal enterococci (fecal streptococci) are excreted by humans and warm-blooded animals of which significant number pass sewage treatment plants and survive for a certain time in the aquatic environment (Kavka and Poetsch, 2002). The coliform bacteria differ considerably in their pathogenic properties, and besides the intestines of vertebrates and invertebrates, they can also be present in the soil. Therefore, for sanitary quality assessment, three groups of coliform bacteria were monitored. Total coliforms can indicate severe water pollution, but this does not have to be directly correlated with an anthropogenic source of pollution, while fecal coliforms are used to indicate fecal pollution. The presence of P. aeruginosa, Proteus sp. and sulphite reducing clostridia in potable water is undesirable, as subsequent growth is often associated with a deterioration of water quality. The obtained values do not exceed the reference values given by the Regulations under which tests are performed, and these water samples were considered bacteriologically correct. The occurrence of these bacteria in small numbers can be explained as secondary pollution. Penetration of aerobic mesophilic bacteria and coliform bacteria from the soil into the water is possible due to corrosion of pipes through the years.

Conclusions

Health safety (microbiological, physicochemical safety) of controlled samples of drinking water from selected artesian drinking fountains in 2013 and 2014, according to legal basis in our country, was established for 72.14% of the samples in 2013 and 72.42% of the samples in 2014. The leading causes of irregularity of water quality from artesian drinking fountains were physicochemical parameters, increased pH value, turbidity and noticeable color. During 2013, hygienic irregularity appears in 17 samples (27.86%) and during 2014 in 16 samples (27.58%). Bacteriologically, water from all drinking fountains in all samplings, was correct. Assessment of water for chemical quality from selected artesian drinking fountains throughout the test period indicates the absence of coliform bacteria and coliform bacteria with the fecal origin, streptococci, P. aeruginosa, sulphite reducing clostridia and Proteus sp. species.