Microbial quality examination of drinking water samples from drinking water vending machine around Nakhon Pathom Rajabhat University

Abstract

The study aims to analyze the microbial quality of drinking water samples from drinking water vending machines by collecting samples in 4 sites around Nakhon Pathom Rajabhat University. Total bacteria were analyzed using Total viable count (TVC). The samples were collected from the drinking water vending machine via 2 methods including without cleaning the water supply head and cleaning the water supply head. The results showed that the 4 samples of drinking water were contaminated with total microbes in the range of 0.14 ± 5.27 - 0.45 ± 17.36 x 102 CFU/ml. 2 samples without cleaning the water supply head sample (Site 2 and Site 4) showed total bacteria higher than standard (500 CFU/ml). Site 1 and Site 3 showed total microbial counts not more than the standard 500 CFU/ml. To cleaning the water supply head, by using 70 % alcohol showed that all samples were not more than the standard 500 CFU/ml. The results from this study found that drinking water samples from drinking water samples from drinking water vending machines have reached the microbiology standard criteria.