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Evaluation of virus reduction efficiency in wastewater treatment unit processes as a credit value in the multiple-barrier system for wastewater reclamation and reuse

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Title: Evaluation of virus reduction efficiency in wastewater treatment unit processes as a credit value in the multiple-barrier system for wastewater reclamation and reuse
Authors: Ito, Toshihiro Browse this author
Kato, Tsuyoshi Browse this author →KAKEN DB
Hasegawa, Makoto Browse this author
Katayama, Hiroyuki Browse this author
Ishii, Satoshi Browse this author
Okabe, Satoshi Browse this author →KAKEN DB
Sano, Daisuke Browse this author →KAKEN DB
Keywords: Bayesian estimation
left-censored data
log-normal distribution
paired and unpaired data
virus reduction efficiency
wastewater reclamation and reuse
Issue Date: Dec-2016
Publisher: IWA Publishing
Journal Title: Journal of water and health
Volume: 14
Issue: 6
Start Page: 879
End Page: 889
Publisher DOI: 10.2166/wh.2016.096
PMID: 27959867
Abstract: The virus reduction efficiency of each unit process is commonly determined based on the ratio of virus concentration in influent to that in effluent of a unit, but the virus concentration in wastewater has often fallen below the analytical quantification limit, which does not allow us to calculate the concentration ratio at each sampling event. In this study, left-censored datasets of norovirus (genogroup I and II), and adenovirus were used to calculate the virus reduction efficiency in unit processes of secondary biological treatment and chlorine disinfection. Virus concentration in influent, effluent from the secondary treatment, and chlorine-disinfected effluent of four municipal wastewater treatment plants were analyzed by a quantitative polymerase chain reaction (PCR) approach, and the probabilistic distributions of log reduction (LR) were estimated by a Bayesian estimation algorithm. The mean values of LR in the secondary treatment units ranged from 0.9 and 2.2, whereas those in the free chlorine disinfection units were from -0.1 and 0.5. The LR value in the secondary treatment was virus type and unit process dependent, which raised the importance for accumulating the data of virus LR values applicable to the multiple-barrier system, which is a global concept of microbial risk management in wastewater reclamation and reuse.
Rights: ©IWA Publishing 2016. The definitive peer-reviewed and edited version of this article is published in Journal of water and health 14 (6) 879-889 2016 DOI: 10.2166/wh.2016.096 and is available at www.iwapublishing.com.
Type: article (author version)
URI: http://hdl.handle.net/2115/66341
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐野 大輔

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