Investigating the bacteriological quality of drinking water in water coolers of contractor workshops under the supervision of Health, Safety and Environment (HSE) Department of Sistan and Baluchestan Water and Wastewater Company

BACKGROUND AND OBJECTIVESWater quality is one of the issues that is directly related to health, individual and public health of the society, and despite various efforts and modern technologies that have been used to produce healthy drinking water, water-borne diseases are among the most common diseases are infectious and are still a concern. The present study was conducted with the aim of investigating the bacteriological quality of water in water coolers of contractor workshops under the supervision of Health, Safety and Environment (HSE) Department of Sistan and Baluchestan Water and Sewerage Company.MATERIALS AND METHODSThe study is of a cross-sectional type and the number of ۱۰ water coolers located in contractor workshops under the supervision of the Department of Health, Safety and Environment (HSE) of Sistan and Baluchestan Water and Sewerage Company and the values related to pH, total coliforms, endothermic coliforms (E. coli), heterotrophic bacteria (HPC) and residual chlorine were measured. Data analysis was done descriptively by EXCEL and SPSS software.RESULTS AND DISCUSSIONThe results showed that the pH values of the samples before and after cooling water were in the range of ۷.۳-۷.۶. Also, the range of residual chlorine in the water before and after entering the water cooler has been measured in the range of ۰.۳-۰.۹ ppm and ۰.۴-۰.۷ ppm, respectively. By investigating of the number of heterotrophic bacteria colonies in cultured samples before and after cooling water, the results showed that this number was in the range of ۴۰۰-۱۲۰۰ cfu/۱۰۰ ml. Also, in some of samples, the confirmation stage related to bacteria of the general form group was positive. After the monthly monitoring, the values related to the above parameters were checked and the results showed a significant decrease in the amount of bacterial contamination.CONCLUSIONThe results of this research showed that there is a possibility of the presence of contaminating microorganisms in the tap water network and water cooler, although in small amounts, and monthly monitoring can be effective in reducing these contaminations. Therefore, regular control and monitoring of drinking water located in workshops is very important for the purpose of water hygiene and maintaining the health of respected workers and preventing the occurrence of any epidemic caused by contaminated water.

کلیدواژه ها:

Drinking Water ، Water Cooler ، Quality of Bacteriology ، HSE