Evaluation of physico-chemical and microbial quality of drinking water in 30 regions of Tehran province, Iran

Marjan Nouri¹

1) Young Researchers and Elite Club, Roudehen Branch, Islamic Azad University, Roudehen, Iran

Publication : International Conference on Engineering & Technology - Norway (12icet.com)
Abstract :
Always water resources, especially sweet waters, are one of the main factors in maintaining the health and sustainable development of societies, which, in addition to quantity, is also of particular importance to its quality. This research was carried out to determine the physico-chemical and microbial quality of drinking water in 30 regions of Tehran province in Iran during the summer of 2018. This study was tested by using randomized sampling method in accordance with national and international standards for water and sewage in terms of pH, turbidity, alkalinity, nitrate, chlorine, total coliform, and thermal coliform with three replications. According to the experiments conducted, the pH (6.47 to 7.81) and turbidity (0.01 to 2.98 NTU) of all samples are within the permitted national and international standards. There was no phenolphthalein alkalinity in any of the samples in terms of alkalinity, and Methyl Orange Alkalinity was also available in all specimens within the allowed range of national and international standard (3 to 147 mL). In the case of the anionic composition, the amount of nitrate was at an acceptable level (7.2 to 20 mg/L), but the amount of chlorine (240.4 to 321.3 mg/L) in some places exceeded the limit. Regarding the microbial conditions, the samples in terms of total coliform and thermal coliform, nearly half of the areas are in contamination and above the allowed range (upper than 4.2 and 0 % respectively). The present study indicates that the physico-chemical quality of drinking water in the studied areas is within the limits of national indicators as well as WHO, While the microbial quality of drinking water in some areas is lower than the national and international standard, and the people of Tehran, through the use of plumbing drinking water, are likely to be at risk for a variety of waterborne.
Keywords : drinking water Tehran Nitrite value chlorine coliform