Characterization of microbial regrowth potential shaped by advanced drinking water treatment
Microbial regrowth in premise plumbing is a threat to water safety. Disinfectant residuals are often diminished during water transportation and stagnation, leading to the regrowth of opportunistic pathogens. Although microbial regrowth potential is mostly determined by water treatment, little is kno...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IWA Publishing
2021-01-01
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| Series: | H2Open Journal |
| Subjects: | |
| Online Access: | http://doi.org/10.2166/h2oj.2021.103 |
| _version_ | 1811334929699569664 |
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| author | Ikuro Kasuga Hitomi Nakamura Futoshi Kurisu Hiroaki Furumai |
| author_facet | Ikuro Kasuga Hitomi Nakamura Futoshi Kurisu Hiroaki Furumai |
| author_sort | Ikuro Kasuga |
| collection | DOAJ |
| description | Microbial regrowth in premise plumbing is a threat to water safety. Disinfectant residuals are often diminished during water transportation and stagnation, leading to the regrowth of opportunistic pathogens. Although microbial regrowth potential is mostly determined by water treatment, little is known about how each treatment step affects two key factors that contribute to microbial regrowth potential: biodegradable organic matter and microbial abundance. In this study, we operated annular reactors to evaluate the microbial regrowth potential of water shaped after each treatment step in a full-scale drinking water treatment plant with ozonation and biological activated carbon filtration. The assimilable organic carbon and total cell count (TCC) were stable at all treatment steps during the sampling period from July to October 2015. The assimilable organic carbon consumption and TCC net increase in the annular reactors indicated that apparent growth yields (cell number base) of microbial communities were different in each reactor. Regrowth potential evaluated by indigenous microbial community in finished water was reduced to 22% of that in raw water, while 75% of assimilable organic carbon in raw water remained in finished water. It suggested that treatment performance evaluated by indigenous microbial communities was better than that evaluated by assimilable organic carbon. HIGHLIGHTS
Changes in microbial regrowth potential in water during advanced drinking water treatment were evaluated.;
The apparent growth yields of microbial communities growing in effluent from each treatment step were different.;
Indigenous microbial community in finished water was used to assess the changes in specific regrowth-promoting substrates.; |
| first_indexed | 2024-04-13T17:16:35Z |
| format | Article |
| id | doaj.art-848772b86a6d4b95a25fd8761d207160 |
| institution | Directory Open Access Journal |
| issn | 2616-6518 |
| language | English |
| last_indexed | 2024-04-13T17:16:35Z |
| publishDate | 2021-01-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | H2Open Journal |
| spelling | doaj.art-848772b86a6d4b95a25fd8761d2071602022-12-22T02:38:07ZengIWA PublishingH2Open Journal2616-65182021-01-014115716610.2166/h2oj.2021.103103Characterization of microbial regrowth potential shaped by advanced drinking water treatmentIkuro Kasuga0Hitomi Nakamura1Futoshi Kurisu2Hiroaki Furumai3 Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan Research Center for Water Environment Technology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan Research Center for Water Environment Technology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan Microbial regrowth in premise plumbing is a threat to water safety. Disinfectant residuals are often diminished during water transportation and stagnation, leading to the regrowth of opportunistic pathogens. Although microbial regrowth potential is mostly determined by water treatment, little is known about how each treatment step affects two key factors that contribute to microbial regrowth potential: biodegradable organic matter and microbial abundance. In this study, we operated annular reactors to evaluate the microbial regrowth potential of water shaped after each treatment step in a full-scale drinking water treatment plant with ozonation and biological activated carbon filtration. The assimilable organic carbon and total cell count (TCC) were stable at all treatment steps during the sampling period from July to October 2015. The assimilable organic carbon consumption and TCC net increase in the annular reactors indicated that apparent growth yields (cell number base) of microbial communities were different in each reactor. Regrowth potential evaluated by indigenous microbial community in finished water was reduced to 22% of that in raw water, while 75% of assimilable organic carbon in raw water remained in finished water. It suggested that treatment performance evaluated by indigenous microbial communities was better than that evaluated by assimilable organic carbon. HIGHLIGHTS Changes in microbial regrowth potential in water during advanced drinking water treatment were evaluated.; The apparent growth yields of microbial communities growing in effluent from each treatment step were different.; Indigenous microbial community in finished water was used to assess the changes in specific regrowth-promoting substrates.;http://doi.org/10.2166/h2oj.2021.103advanced drinking water treatmentannular reactorassimilable organic carbonmicrobial regrowth potential |
| spellingShingle | Ikuro Kasuga Hitomi Nakamura Futoshi Kurisu Hiroaki Furumai Characterization of microbial regrowth potential shaped by advanced drinking water treatment H2Open Journal advanced drinking water treatment annular reactor assimilable organic carbon microbial regrowth potential |
| title | Characterization of microbial regrowth potential shaped by advanced drinking water treatment |
| title_full | Characterization of microbial regrowth potential shaped by advanced drinking water treatment |
| title_fullStr | Characterization of microbial regrowth potential shaped by advanced drinking water treatment |
| title_full_unstemmed | Characterization of microbial regrowth potential shaped by advanced drinking water treatment |
| title_short | Characterization of microbial regrowth potential shaped by advanced drinking water treatment |
| title_sort | characterization of microbial regrowth potential shaped by advanced drinking water treatment |
| topic | advanced drinking water treatment annular reactor assimilable organic carbon microbial regrowth potential |
| url | http://doi.org/10.2166/h2oj.2021.103 |
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