شناسايي باكتري ها شاخص مدفوعي در آب هاي شيرين و سطحي شهر زنجان

Detection of fecal indicator microbes in Zanjans fresh water and surface waters

Water quality is usually determined through detection of a few microbiological parameters, typically fecal indicator such as total coliform (TC), fecal coliform (FC), E.coli, Clostridium perfringens, Streptococcus faecal is(FS). Fecal indicators are found in elevated concentrations in human and animal feces. Water quality samples were analyzed for five bacteria, TC, FC, E.coli, C.perfringens, S.faecalis. Goal of this study TC, FC, E.coli, S.faecalis measured by the MPN method at this study and C.perfringenswas was detected by useing of litmuse milk and stormy fermentation. Results show that the number of TC less than 1000 MPN/l00ml in 60% of samples and FC lees than 1000 MPN/100ml in 77% of samples and S.faecalis in 77% of samples was 3 MPN/l00ml. Ratio FC/FS in 49% was more than 4 and also there was C.perfringens in 54% of samples. Present of fecal indicator bacteria in water indicates potential adverse health effects for indivduals or populations exposed to this waters, we conclude that there is a risk of infection for users of Zanjan,s fresh and surface waters.