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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
| 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)
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Submitter: 佐野 大輔
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