Disinfection effect and its influencing factors of rural drinking water in Zhejiang Province / 预防医学

Objective@#To learn the disinfection effect and its influencing factors of drinking water in rural areas of Zhejiang Province,so as to provide scientific basis for the control of microbial pollution in drinking water and prevention of waterborne diseases. @*Methods@#A total of 5 299 samples from 879 rural water plants Zhejiang Province were collected by stratified sampling method in 2017. The disinfection effect of water samples was assessed quality according to GB 5749-2006 Hygienic Standards for Drinking Water. Logistic regression models were used to analyze the influencing factors for disinfection effect of rural drinking water. @*Results@#There were 540 rural water plants in Zhejiang Province adopting routine process for water purification,accounting for 61.43%;771 ones using surface water,accounting for 87.72%. About 4 458 samples（84.13%）were disinfected and the qualified rate was 86.05%,22.32% of which were disinfected by chlorine dioxide and the qualified rate was 100.00%. The results of multivariate logistic regression analysis showed that scale of water plant,disinfectant residue,use frequency of disinfection equipment,disinfection,season and source water turbidity were the influencing factors for the disinfection effect of rural drinking water（P<0.05）;disinfection,disinfectant residue,use frequency of disinfection equipment and source water turbidity were the influencing factors for the disinfection effect of finished water（P<0.05）;disinfection,disinfectant residue,use frequency of disinfection equipment,source water turbidity and scale of water plant were the influencing factors for the disinfection effect of tap water（P<0.05）;disinfectant residue,use frequency of disinfection equipment,source water turbidity and scale of water plant were the influencing factors forthe disinfection effect of surface water（P<0.05）;disinfectant residue,use frequency of disinfection equipment,source water turbidity and pH were the influencing factors for the disinfection effect of groundwater（P<0.05）.@*Conclusion@#The disinfection effect of drinking water in rural areas of Zhejiang Province is associated with source water quality,scale of plants,water purification technique and so on. The disinfection process should be improved,the management of water plants should be strengthened to reduce the risk of microbial contamination.

Bacteriological quality of drinking water sources in rural communities of Dire Dawa administrative council

In Ethiopia, access to improved water supply and sanitation was estimated at 38% and 12% respectively. Three- forth of the health problems of children in Ethiopia are communicable diseases due to polluted water and improper water handling practices. Thus, this study was conducted to assess the microbiological quality of drinking water sources in rural communities of Dire Dawa Administrative Council (Adada Peasant Association). A cross-sectional study was conducted from February 2011 to May 2011. Microbiological water quality parameters were analyzed using the membrane filtration method. Water analysis demonstrated that all water sources in the study area were contaminated with total coliforms and fecal coliform. The fact that, about 83.34% of the water sample was positive for indicator bacteria shown that the three selected Peasant Associations had risk of contamination. High concentration of microbiological indicators in all water sources of this study area have demonstrated the presence of pathogenic organisms which constitute a threat to anyone consuming or in contact with these waters. The majority of the drinking water sources is either of unacceptable quality or grossly polluted. Regular quality control mechanisms need to be in place to ensure safety of drinking water.

Water quality of Angke River: Microbiological point of view.

This research is a part of a multidisciplinary research in the Angke River. The aim of this research is to study the river’s water quality from the microbiological point of view in several locations along the Angke River. The locations under this study included: Duri Kosambi, Pesing Poglar, Teluk Gong, Pantai Indah Kapuk and Estuary (4 points). The examinations were held in term of microbiological aspects, based on the guide published by the Ministry of Health, the Republic of Indonesia and concluded according to Government Regulation. The parameter of microbiological tests was the most probability number (MPN) of total and fecal coliform. The method used was done in 2 steps: presumptive and confirmed test. Completed test was conducted to confirm the presence of E.coli and other bacteria in water. The result showed that the water quality of the Angke River was poor; therefore, it is not recommended to be used as drinking water. It is categorized as the 2nd class quality that means it can only be used for water recreation, veterinary, showering plants and or other purposes that require the same quality of water. The MPN of total coliform at Pantai Indah Kapuk and the outer side of river mouth (estuary area) was lower than other areas. People who live in Pantai Indah Kapuk are having a higher economic level. Therefore, it can be assumed that they are more educated people who have more insight about hygiene. Further, the water at the outer side of river mouth contains a higher salt concentration that can kill pathogenic bacteria. In conclusion, the water quality of the Angke River is categorized as 2nd class quality not recommended to be used as dringking water except the water from Pantai Indah Kapuk and estuary area that can be used as dringking water after boiling.

Avaliação microbiológica da água consumida nos bebedouros da Universidade Estadual do Centro-Oeste, Guarapuava, Paraná, Brasil / Microbiological evalution of water from drinking-fountains of State University of Guarapuava, Paraná State, Brazil

A água é o principal elemento para os seres vivos, podendo ser também uma potencial via de transmissão de inúmeras doenças. O presente trabalho teve como objetivo avaliar a qualidade Microbiológica da água destinada ao consumo humano de bebedouros da Universidade Estadual do Centro-Oeste (UNICENTRO). Foram colhidas 47 amostras de água de bebedouros localizados nos diversos departamentos da universidade. Utilizou-se o método de fermentação em tubos múltiplos que determina o Número Mais Provável (NMP) de bactérias coliformes totais e fecais/100 mL. Os resultados revelam 4/47 (8,5) amostras positivas para coliformes, totais e 1/47 (2) para coliformes fecais. Considerando a legislação vigente conclui-se que em três bebedouros a água, sob o ponto de vista bacteriológico, estava imprópria para o consumo humano

The goal of this work was to evaluate micriobiologic quality of water consumed in drinking-fountainsfrom State University of Guarapuava, Paraná state, Brazil. Total and fecal coliforms were searched for thepourpose of evaluating quality of water consumed. Fourty seven samples were obtainied and 4/47(8,5%) were positive to total coliforms and 1/47 (2%) were positive to fecal coliforms. Three samplesshowed unsatisfactory hygienic conditions considering Public Health Legislation