Microbial risk assessment for recreational use of the Kallang Basin, Singapore
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2014.
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| Other Authors: | |
| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2014
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| Online Access: | http://hdl.handle.net/1721.1/90154 |
| _version_ | 1826207802047070208 |
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| author | Park, Allison (Allison Minjung) |
| author2 | Peter Shanahan. |
| author_facet | Peter Shanahan. Park, Allison (Allison Minjung) |
| author_sort | Park, Allison (Allison Minjung) |
| collection | MIT |
| description | Thesis: M. Eng., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2014. |
| first_indexed | 2024-09-23T13:55:11Z |
| format | Thesis |
| id | mit-1721.1/90154 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T13:55:11Z |
| publishDate | 2014 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/901542019-04-12T20:20:10Z Microbial risk assessment for recreational use of the Kallang Basin, Singapore Park, Allison (Allison Minjung) Peter Shanahan. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering. Civil and Environmental Engineering. Thesis: M. Eng., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2014. Cataloged from PDF version of thesis. Includes bibliographical references (pages 68-72). The water quality in the Kallang Basin, Singapore, was analyzed in order to determine how safe the waters are for recreational users, specifically focusing on dragon-boat racers. The Public Utilities Board of Singapore has been managing reservoirs under the "Active, Beautiful, and Clean Waters Programme" in order to help the public recognize the value of their scarce water sources. Therefore, microbial risk assessments were conducted on locations along the Kallang Basin to analyze any diurnal or spatial differences in probabilities of illness, and establish guideline geometric mean concentrations. Samples were collected at four different locations along the Kallang Basin every four hours during a 48-hour period. Samples were then analyzed for Enterococci and E. coli using most-probable-number methods. Adenovirus was analyzed by Liu (2014) using quantitative polymerase chain reaction. Based on the Wiedenmann et al. (2006) statistics-based risk model, no-observed-adverse-risk levels or guideline geometric-mean levels were established at 128 colony forming units (CFU) / 100 mL for Enterococci and 697 CFU/ 100 mL for E. coli. Based on these guideline geometric-mean concentrations, all of the stations exceeded the tolerable illness level for indicator bacteria at certain times, with peak concentrations at 7:00 A.M. and 11:00 A.M. However, for adenovirus, the probabilities of illness did not exceed the tolerable level based on appropriate dragon-boat racer ingestion rates. Statistical analysis showed that a high correlation existed between adenovirus concentrations and E. coli concentrations. Future studies should analyze specific locations along the Kallang Basin that contribute to high concentrations of indicator bacteria and viruses. by Allison Park. M. Eng. 2014-09-19T21:42:58Z 2014-09-19T21:42:58Z 2014 2014 Thesis http://hdl.handle.net/1721.1/90154 890197885 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 84 pages application/pdf a-si--- Massachusetts Institute of Technology |
| spellingShingle | Civil and Environmental Engineering. Park, Allison (Allison Minjung) Microbial risk assessment for recreational use of the Kallang Basin, Singapore |
| title | Microbial risk assessment for recreational use of the Kallang Basin, Singapore |
| title_full | Microbial risk assessment for recreational use of the Kallang Basin, Singapore |
| title_fullStr | Microbial risk assessment for recreational use of the Kallang Basin, Singapore |
| title_full_unstemmed | Microbial risk assessment for recreational use of the Kallang Basin, Singapore |
| title_short | Microbial risk assessment for recreational use of the Kallang Basin, Singapore |
| title_sort | microbial risk assessment for recreational use of the kallang basin singapore |
| topic | Civil and Environmental Engineering. |
| url | http://hdl.handle.net/1721.1/90154 |
| work_keys_str_mv | AT parkallisonallisonminjung microbialriskassessmentforrecreationaluseofthekallangbasinsingapore |