Associations of chemical tracers and faecal indicator bacteria in a tropical urban catchment

Surface water contamination by human faecal wastes is a widespread hazard for human health. Faecal indicator bacteria (FIB) are the most widely used indicators to assess surface water quality but are less-human-specific and have the potential to survive longer and/or occur naturally in tropical area...

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Main Authors: Ekklesia, Eveline, Shanahan, P., Chua, L. H. C., Eikaas, H. S.
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2015
Subjects:
Online Access:https://hdl.handle.net/10356/107110
http://hdl.handle.net/10220/25261
http://dx.doi.org/10.1016/j.watres.2015.02.037
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1071102019-12-06T22:24:56Z Associations of chemical tracers and faecal indicator bacteria in a tropical urban catchment Ekklesia, Eveline Shanahan, P. Chua, L. H. C. Eikaas, H. S. School of Civil and Environmental Engineering Centre for Environmental Sensing and Modeling (CENSAM) Public Utilities Board of Singapore DRNTU::Engineering::Environmental engineering::Water supply Surface water contamination by human faecal wastes is a widespread hazard for human health. Faecal indicator bacteria (FIB) are the most widely used indicators to assess surface water quality but are less-human-specific and have the potential to survive longer and/or occur naturally in tropical areas. In this study, 13 wastewater chemicals (chloride, boron, orthosphophate, detergents as methylene blue active substances, cholesterol, cholestanol, coprostanol, diethylhexyl phthalate, caffeine, acetaminophen, ibuprofen, sucralose and saccharin) were investigated in order to evaluate tracers for human faecal and sewage contamination in tropical urban catchments. Surface water samples were collected at an hourly interval from sampling locations with distinct major land uses: high-density residential, low-density residential, commercial and industrial. Measured concentrations were analysed to investigate the association among indicators and tracers for each land-use category. Better correlations were found between different indicators and tracers in each land-use dataset than in the dataset for all land uses, which shows that land use is an important determinant of drain water quality. Data were further segregated based on the hourly FIB concentrations. There were better correlations between FIB and chemical tracers when FIB concentrations were higher. Therefore, sampling programs must be designed carefully to take the time of sampling and land use into account in order to effectively assess human faecal and sewage contamination in urban catchments. FIB is recommended as the first tier in assessment of surface water quality impairment and chemical tracers as the second tier. Acetaminophen and coprostanol are recommended as chemical tracers for high-density residential areas, while chloride, coprostanol and caffeine are recommended for low-density residential areas. NRF (Natl Research Foundation, S’pore) Accepted version 2015-03-24T04:34:45Z 2019-12-06T22:24:56Z 2015-03-24T04:34:45Z 2019-12-06T22:24:56Z 2015 2015 Journal Article Ekklesia, E., Shanahan, P., Chua, L., & Eikaas, H. (2015). Associations of chemical tracers and faecal indicator bacteria in a tropical urban catchment. Water research, 75, 270-281. 0043-1354 https://hdl.handle.net/10356/107110 http://hdl.handle.net/10220/25261 http://dx.doi.org/10.1016/j.watres.2015.02.037 en Water research © 2015 Elsevier Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Water Research, Elsevier Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.watres.2015.02.037]. 41 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering::Water supply
spellingShingle DRNTU::Engineering::Environmental engineering::Water supply
Ekklesia, Eveline
Shanahan, P.
Chua, L. H. C.
Eikaas, H. S.
Associations of chemical tracers and faecal indicator bacteria in a tropical urban catchment
description Surface water contamination by human faecal wastes is a widespread hazard for human health. Faecal indicator bacteria (FIB) are the most widely used indicators to assess surface water quality but are less-human-specific and have the potential to survive longer and/or occur naturally in tropical areas. In this study, 13 wastewater chemicals (chloride, boron, orthosphophate, detergents as methylene blue active substances, cholesterol, cholestanol, coprostanol, diethylhexyl phthalate, caffeine, acetaminophen, ibuprofen, sucralose and saccharin) were investigated in order to evaluate tracers for human faecal and sewage contamination in tropical urban catchments. Surface water samples were collected at an hourly interval from sampling locations with distinct major land uses: high-density residential, low-density residential, commercial and industrial. Measured concentrations were analysed to investigate the association among indicators and tracers for each land-use category. Better correlations were found between different indicators and tracers in each land-use dataset than in the dataset for all land uses, which shows that land use is an important determinant of drain water quality. Data were further segregated based on the hourly FIB concentrations. There were better correlations between FIB and chemical tracers when FIB concentrations were higher. Therefore, sampling programs must be designed carefully to take the time of sampling and land use into account in order to effectively assess human faecal and sewage contamination in urban catchments. FIB is recommended as the first tier in assessment of surface water quality impairment and chemical tracers as the second tier. Acetaminophen and coprostanol are recommended as chemical tracers for high-density residential areas, while chloride, coprostanol and caffeine are recommended for low-density residential areas.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Ekklesia, Eveline
Shanahan, P.
Chua, L. H. C.
Eikaas, H. S.
format Article
author Ekklesia, Eveline
Shanahan, P.
Chua, L. H. C.
Eikaas, H. S.
author_sort Ekklesia, Eveline
title Associations of chemical tracers and faecal indicator bacteria in a tropical urban catchment
title_short Associations of chemical tracers and faecal indicator bacteria in a tropical urban catchment
title_full Associations of chemical tracers and faecal indicator bacteria in a tropical urban catchment
title_fullStr Associations of chemical tracers and faecal indicator bacteria in a tropical urban catchment
title_full_unstemmed Associations of chemical tracers and faecal indicator bacteria in a tropical urban catchment
title_sort associations of chemical tracers and faecal indicator bacteria in a tropical urban catchment
publishDate 2015
url https://hdl.handle.net/10356/107110
http://hdl.handle.net/10220/25261
http://dx.doi.org/10.1016/j.watres.2015.02.037
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