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Hadhramout University Journal of Natural & Applied Sciences

Hadhramout University Journal of Natural & Applied Sciences

Abstract

Assessment of faecal contamination and detection enumeration of coliforms and other microorganisms in water is one of the measurements to determine the hygienic quality of water. This study aimed to assess the drinking water in some primary and secondary schools in Mukalla city-Hadhramout/Yemen to estimate the bacterial contamination of drinking water and its safety to the public. The water samples were studied for bacteriological analysis in which was inoculated into culture media using two methods, the presumptive test for the most probable number (MPN) and confirmatory test for bacterial identification. Also, some physiochemical properties of water such as temperature, total dissolved salts (TSS), electrical conductivity, hydrogen ion concentration (pH) and turbidity were measured and compared with the criteria of Yemeni and World Health Organization (WHO) qualifications. This study revealed that the bacterial pollution of drinking water was shown in 8 schools with Escherichia coli 33%, coliforms of Proteus spp. 25% and Citrobacter spp. 17% and Staphylococcus spp. 25%.In conclusion, this study showed that if the values of total dissolved salts, electrical conductivity, temperature, pH and turbidity increased in water, the bacterial number in water also increased, and the bacterial pollution indicates inadequate drinking water and the need to be treated and filtered.

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