Journal of Environmental Biology

Microbiological safety of household membrane water filter

Yongli Zhang¹, Qing Wang², Wei Lou³, Yuxin Wang⁴ and Xuan Zhu⁴*

¹Zhoushan Municipal Center for Disease Prevention and Control, Zhoushan, 316021, China

²Key Laboratory of Environmental and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China

³Shengsi County Center for Disease Prevention and Control, Shengsi, 202450, China

⁴Xiamen No.2 Hospital, Xiamen, 361021, China

*Corresponding Author email : julia7303@gmail.com

Publication Data

Paper received:

06 August 2012

Revised received:

17 October 2012

Accepted:

17 December 2012

Abstract

Waterborne pathogens outbreaks are major reasons of diarrhea disease worldwide. Detecting and monitoring emerging waterborne pathogens (EWPs) is important for drinking water microbiological safety. The microbiological safety of household water hollow fiber membrane filter which is the end of drinking water treatment process was studied with heterotrophic plate count (HPC) and real-time PCR method. The effect of the flow rate, idle time and washing fashion were investigated. Among the selected filters from three manufacturers, only the PVDF membrane water filter (Brand B) could achieve a good water purification criteria. Brand A was found a certain degree of EWPs in its effluent. The lowest bacteria-removing efficiency of the PVC membrane water filter was found Brand C. Our study showed that the microorganisms could reach up to 10^6 CFU ml-1 and the 16s rDNA could reach up to 10^6 copies ml-1 in the initial filtrate of Brand C. More species and amounts of EWPs were detected in the washing water. These results suggested that the popular household membrane filters might cause microbiological risks at certain circumstances such as the shock load of EWPs and leakage of the membranes in the case of abnormal source water or poor membrane filter quality.

Key words

Drinking water, Emerging waterborne pathogens, Household membrane water filter, Real-time PCR

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