ABSTRACT
Objective To evaluate sanitary quality of drinking water of small centralized water supply in rural areas using fuzzy comprehensive evaluation method.Methods Fifteen rural small centralized water supply facilities in Jinhua City were randomly selected.The health -related indicators were detected,and fuzzy comprehensive evaluation was used to evaluate the test results.Results The qualification rate of fifteen rural small centralized water supply facilities detected was 6. 67%.The qualified rate of the heat-resistant coliform bacteria in all items was 26. 67%,and the qualified rate of total coliforms was 6. 67%.The qualified rate of total numbers of colony,fluorid,chloride,sulfate,total dissolved solids, iron,oxygen consumption,total hardness and nitrate was all 1 00%.Sanitary quality of the water supply facilities was judged by the fuzzy membership evaluation.There were 4 water supply facilities evaluated as level Ⅰ(good),level Ⅱ(qualified ) and level Ⅳ (bad ) respectivley,and 3 water supply facilities evaluated as level Ⅲ (poor ).Fuzzy comprehensive index of sanitary quality was less than 0. 5 .Conclusion There is a risk of security in rural small centralized water supply water of Jinhua City.The low qualified rate of rural small centralized water supply water was due to heat-resistant coliform bacteria and total coliforms.The relevant departments should strengthen the hygiene management. Disinfection equipment should be installed,and standardized disinfection should be promoted to improve water quality.
ABSTRACT
Objective To assess the hygienic status of the central air conditioning ventilation system in public places by fuzzy comprehensive evaluation method.Methods According to the comprehensive evaluation method of public place (WS /T 199—2001),a fuzzy comprehensive evaluation method was applied to evaluate central air conditioning ventilation systems in 15 large public places of Jinhua City.Results The qualified rate of central air ventilation system was 53.30%, and the qualified rates of total number of bacteria,the fungi,β-hemolytic streptococcus in air blow and Legionella bacteria in the cooling water all reached 100.00%.At the same time,the qualified rate of bacteria,fungi and dust volume in internal surface of pipe were 93.33%,86.67% and 80.00% respectively.The qualified rate of PM10 was 86.67%. Among 15 central air conditioning ventilation systems,13 systems were evaluated as level Ⅰ,and the other two was as level Ⅱand Ⅳ respectively.TAAlso,14 evaluated units got the fuzzy comprehensive indexes of central air ventilation less than 0.5.Conclusion The hygiene status of central air conditioning ventilation system in Jinhua is acceptable,and the management of hygiene quality should be strengthened.