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Risk assessment of Giardia from a full scale MBR sewage treatment plant caused by membrane integrity failure
Zhang, Yu; Chen, Zhimin; An, Wei; Xiao, Shumin; Yuan, Hongying; Zhang, Dongqing; Yang, Min
2015-04-01
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
Volume30Pages:252-258
AbstractMembrane bioreactors (MBR) are highly efficient at intercepting particles and microbes and have become an important technology for wastewater reclamation. However, many pathogens can accumulate in activated sludge due to the long residence time usually adopted in MBR, and thus may pose health risks when membrane integrity problems occur. This study presents data from a survey on the occurrence of water-borne Giardia pathogens in reclaimed water from a full-scale wastewater treatment plant with MBR experiencing membrane integrity failure, and assessed the associated risk for green space irrigation. Due to membrane integrity failure, the MBR effluent turbidity varied between 0.23 and 1.90 NTU over a period of eight months. Though this turbidity level still met reclaimed water quality standards (<= 5 NTU), Giardia were detected at concentrations of 0.3 to 95 cysts/10 L, with a close correlation between effluent turbidity and Giardia concentration. All beta-giardin gene sequences of Giardia in the WW'PP influents were genotyped as Assemblages A and B, both of which are known to infect humans. An exponential dose response model was applied to assess the risk of infection by Giardia. The risk in the MBR effluent with chlorination was 9.83 x 10(-3), higher than the acceptable annual risk of 1.0 x 10(-4). This study suggested that membrane integrity is very important for keeping a low pathogen level, and multiple barriers are needed to ensure the biological safety of MBR effluent. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
Department环境水质学国家重点实验室
KeywordGiardia Reclaimed Water Water Quality Risk Genotype
WOS Research AreaEnvironmental Sciences
WOS IDWOS:000353844800031
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/32841
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Zhang, Yu,Chen, Zhimin,An, Wei,et al. Risk assessment of Giardia from a full scale MBR sewage treatment plant caused by membrane integrity failure[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2015,30:252-258.
APA Zhang, Yu.,Chen, Zhimin.,An, Wei.,Xiao, Shumin.,Yuan, Hongying.,...&Yang, Min.(2015).Risk assessment of Giardia from a full scale MBR sewage treatment plant caused by membrane integrity failure.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,30,252-258.
MLA Zhang, Yu,et al."Risk assessment of Giardia from a full scale MBR sewage treatment plant caused by membrane integrity failure".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 30(2015):252-258.
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