Zeynab Tabatabaei; Mohammad Ali Baghapour; Vafa Lotfi; Amin Samzadeh
Abstract
Background: Natural Organic Matters (NOMs) react in the presence of residual chlorine in distribution network pipes, producing such byproducts as Trihalomethanes which are carcinogenic and mutagenic. The present study was conducted to investigate the quality of drinking water in Shiraz. Methods: In this ...
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Background: Natural Organic Matters (NOMs) react in the presence of residual chlorine in distribution network pipes, producing such byproducts as Trihalomethanes which are carcinogenic and mutagenic. The present study was conducted to investigate the quality of drinking water in Shiraz. Methods: In this cross-sectional study, 54 samples were taken from 27 locations in both summer and winter. For each sample, temperature, residual chlorine, pH, and NOM were measured during the two seasons. Residual chlorine and temperature measurement were performed at the sampling sites, but pH and NOM were measured in the laboratory. Results: According to the results, the mean concentrations of Total NOM (TNOM), residual chlorine, pH, and temperature varied from 0.9 to 5 m-1, 0 to 1.2 mg/L, 7.4 to 8 and 18 to 23.5 ᵒC in summer and from 0.3 to 1.5 m-1, 0 to 0.8 mg/L, 7.6 to 8.2 and 9.7 to 10.8 ᵒC in winter, respectively. In addition, the concentrations of all measured parameters, except for pH, were reported to be higher in summer than in winter. Conclusion: As a result, since the amount of NOM in the drinking water distribution network of Shiraz was not zero, regular monitoring of these compounds in the distribution networks is recommended to be done by engineers.
Masoud Yousefi; Fatemeh Mesbahi; Iraj Abbasi; Mahboobeh Kousha; Kourosh Rahmani
Abstract
Background: Nowadays, in the world’s optimal management of science and technology, the use of geographical information system (GIS) is a necessity. In this study, GIS was used to analyze and detect microbial contamination in the water supply system of Masiri city. Methods:A cross-sectional study ...
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Background: Nowadays, in the world’s optimal management of science and technology, the use of geographical information system (GIS) is a necessity. In this study, GIS was used to analyze and detect microbial contamination in the water supply system of Masiri city. Methods:A cross-sectional study utilizing spatial analysis techniques was conducted to find out the water quality problems of water supply system. In this descriptive-analytical study, 400 water samples from all groundwater resources of Masiri city were conducted during two periods of dry and wet season. Residual chlorine, MPN and E.coli of the samples were determinate. Results: Results were compared with national standards and analyzed using SPSS and ArcView software. Concentration distribution map in GIS and the factors affecting Residual chlorine, MPN and E.coli changes were investigated. According to the results obtained in ArcView, it is necessary to improve the microbial quality of Masiri water distribution network in some places, which can be improved by proper management of chlorination and defects. Conclusion:It is concluded that a combination of water quality parameters and GIS methods is very useful asGIS provides efficient capacity to visualize the spatial data.