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Survey of Effective Parameters (Water Sources, Seasonal Variation and Residual Chlorine) on Presence of Thermotolerant Coliforms Bacteria in Different Drinking Water Resources



Mirzaei N1, 2 ; Ghaffari HR2, 3 ; Karimyan K2 ; Moghadam FM4 ; Javid A5 ; Sharafi K2, 6
Authors
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Authors Affiliations
  1. 1. Environmental Health Research Center, Kurdistan University of Medical Sciences, Sanandaj, Iran
  2. 2. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Social Determinants in Health Promotion Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
  4. 4. Department of Environmental Health Engineering, School of Health, Shahrekord University of Medical Sciences, Shahrekord, Iran
  5. 5. School of Public Health, Shahroud University of Medical Sciences, Shahroud, Iran
  6. 6. Department of Environmental Health Engineering, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran

Source: International Journal of Pharmacy and Technology Published:2015

Abstract

Thermotolerant Coliforms (TtC) bacteria is one of the microbial quality indicators of drinking water. This study was aimed to Survey of Effective parameters (Water Resources, Seasonal Variation and Residual Chlorine) on Presence of thermotolerant bacteria in drinking water. For this study, data of the last 10 years assessments of microbial quality regarding various species of fecal coliform was taken from health centers associated with urban, rural and private sources of Kermanshah city. A total number of 8643 samples were taken, 1851 samples from rural, 365 from urban and 4834 from private resources. The results showed that fecal coliform, Escherichia coli (22.3%) and Klebsiella (2%) were the most and least bacteria existent in urban water resources, respectively. In rural water sources, E. coli (45.9%) and Enterobacter cloacea (2.6%) and in private sources E. coli (34%) and Klebsiella (1.3%) had the most and least existent, respectively. Further, E. coli (47.5%) and Klebsiella (0.4%) had, respectively, the highest and lowest distribution in all months considered. In addition the results showed a significant decrease of distribution of fecal coliforms with increasing residual chlorine, while a decreasing trend is observed from the dose of 0.8 mg/L. According to the results, it can be stated that among fecal coliforms, E. coli has the widest distribution in water resources and because this bacterium causes diseases such as diarrhea and hemolytic uremic syndrome, so is of particular importance in the monitoring of water resources. Hence it is necessary to consider the bacterium in resources with low microbial quality, especially in the hot seasons.