Assessment of Microbial Quality and Chlorimetry of Drinking Water of the Abadeh City During 2015-2016 and Comparison with the National and WHO Standards

Subject Areas : Environmental pollutions (water, soil and air)

Leila Nematollahi ¹ , haniyeh nowzari ²

1 - M.Sc. Graduated of Natural Resources Engineering, Department of Environment, Abadeh Branch, Islamic Azad University, Abadeh, Iran.
2 - Assistant Professor, Department of Environment, Abadeh Branch, Islamic Azad University, Abadeh, Iran *(Corresponding Authors).

Received: 2017-01-08 Accepted : 2017-07-19 Published : 2020-01-21

Keywords: Residual chlorine, Coliform, Water network, Abadeh city,

Abstract :

Background and Objective: Water quality is one of the issues that are directly related to the health and personal and public health of the society, and monitoring the water and providing its health conditions is of great importance. Therefore, the aim of this study was to determine the microbial quality of drinking water in Abadeh in 2015 and to compare its quality with national standards and the World Health Organization (WHO). Method: In this study, 122 water samples for microbial measurement and 3864 water samples for chlorimetry were analyzed from water network of Abadeh city during 2015-2016. Multiple tube fermentation method and colorimetric method were used to determine fecal and total coliform bacteria and residual chlorine, respectively. Finally, all data were analysed by one sample T-test, Chi-Square, Mann-Withney, Kruskal-Wallis and Pearson Correlation Matrix. Findings: The results showed that the total coliform was 0 MPN/100ml in 98.36% of all samples and the fecal coliform was 0 MPN/100ml in 100% of all samples by microbial analysis and the residual chlorine were desirable in 78.0% of the samples and meet the expectations of national and international standards. Winter and summer showed the lowest and greatest amount of residual chlorine, respectively. On the other hand, the results showed significant negative associations between the amounts of the residual chlorine of the water with the presence of coliform bacteria in the water. Discussion and Conclusion: The microbial index of drinking water of the Abadeh city is lower than the standard limit of the WHO microbial Index and the national standard. As a result, the quality of drinking water of the city is desirable.

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