Modeling fecal coliform contamination in a tidal Danshuei River estuarine system

Liu, Wen‐Cheng; Chan, Wen-Ting; Young, Chih-Chieh

doi:10.1016/j.scitotenv.2014.09.065

Cited by 35 publications

(29 citation statements)

References 31 publications

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“…Moreover, the sewage outflows at intertidal sites are exposed, and the pressure gradient is favorable to the discharge. This pattern is similar to that described by other estuarine shallow water studies (MILL et al, 2006;PORTNOY et al, 2006;RODRIGUES et al, 2011;LIU et al, 2015), where much higher salinity and lower coliform concentrations were found, the seawater thus limiting the coliform concentrations both by stress and dilution.…”

Section: Discussionsupporting

confidence: 91%

Spatial and temporal distribution of thermotolerant coliform in Canal de Passagem (Vitória - ES) - related to physico-chemical parameters and tide

2015

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The Canal de Passagem (CP), Vitória -ES, is an estuarine system undergoing a process of environmental degradation due to the discharge of in natura and semi-treated sewage. The surrounding local community's use of the estuarine resources conflicts with environmental quality and this offers risks to public health. The objective of this study was 1. to evaluate the distribution of fecal coliforms in the HCP (multiple tubes method), relating it to the distribution of sources of fecal pollution, the dynamics of the tides and physico-chemical parameters, and 2. evaluate the results in the light of the limits established by Brazilian legislation to ensure the health of the users of the water whatever the use to which it is put. Samples were taken spatially and temporally, to assess the tidal cycle of the spring tide in the winter, autumn and spring seasons, and also of the neap and spring tides at two sampling events in the summer. The sanitary parametersthermotolerant coliforms, physico-chemical, and tidal action, were considered. Meaningful correlations were found with the tidal regime. As conclusion, that the distribution of thermotolerant coliforms was related to the point sources of pollution, and the concentrations were different between spring and neap tides. This difference between tides is not taken into consideration by the Brazilian Bathing Water Legislation up to now. O Canal de Passagem, Vitória, ES, é um sistema estuarino em processo de degradação ambiental devido à descarga de esgoto in natura e semitratado. Os usos da comunidade do entorno dos recursos locais estuarinos são conflitantes com a qualidade ambiental, o que pode oferecer riscos para a saúde pública. Os objetivos do presente trabalho foram: 1. avaliar a distribuição de coliformes termotolerantes dentro do HCP (método dos tubos múltiplos), relacionando-a com a distribuição das fontes de poluição fecal, a dinâmica de marés e parâmetros físico-químicos, e 2. avaliar os resultados dentro das leis brasileiras de limites sanitários para os variados usos da água e balneabilidade. Amostras foram feitas espacialmente e temporalmente, visando cobrir o ciclo de marés de sizígia no inverno, outono e primavera, e também cobrindo uma quadratura e uma sizígia na amostragem no verão. Foram considerados os parâmetros sanitários -coliformes termotolerantes, físicos e químicos e a ação das marés. Correlações significativas foram encontradas com o regime das marés e distribuição de coliformes. A conclusão retirada do trabalho foi que a distribuição de coliformes termotolerantes esteve relacionada com as fontes pontuais de poluição, e as concentrações foram diferentes entre as marés de quadratura e sizígia. Variação entre tais marés não é observada até o momento pela Legislação Brasileira para as águas balneáveis. AbstrAct

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Section: Discussionsupporting

confidence: 91%

Spatial and temporal distribution of thermotolerant coliform in Canal de Passagem (Vitória - ES) - related to physico-chemical parameters and tide

2015

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“…The results revealed that the faecal contamination in the river system are largely reduced after introducing primary and secondary wastewater treatment. This is also supported by other studies (Vijay et al, 2016, Liu et al, 2015b, Ouattara et al, 2013. The FIB concentrations substantially improved along with the compliance of USEPA specified bathing water quality standards (E. coli 235 cfu/100ml and enterococci 104 cfu/100ml) in many of the occasions.…”

Section: Influence Of Wastewater Treatment On Microbial Water Qualitysupporting

confidence: 80%

“…Process-based models for pathogens describe the hydrodynamic situation in the water body and take into account the decay of pathogens in the water environment (Sokolova et al, 2013, Liu et al, 2015b. However, process-based modelling of microbial water quality is very sparse, particularly in the developing countries where diarrheal diseases are endemic (Hofstra, 2011).…”

Section: Application Of Process-based Modelling and Scenario Analysismentioning

confidence: 99%

“…Previous studies have shown that concentrations of faecal contaminants in water sources can be described using coupled hydrodynamic-microbial models (Harwood et al, 2005, Sokolova et al, 2013, Ouattara et al, 2013, Liu et al, 2006. These models describe the hydrodynamic situation in the water body and take into account the decay of microorganisms in the water environment (Sokolova et al, 2013, Liu et al, 2015b. These models can be used for scenario analysis in order to provide a basis for water management, for example to plan mitigation measures in terms of reducing faecal contamination of a water body.…”

Section: Introductionmentioning

confidence: 99%

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Assessing the impact of socio-economic development and climate change on faecal indicator bacteria in the Betna River, Bangladesh

Islam¹

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“…Rodrigues et al (2009) (Skariyachan et al, 2013), with fecal coliforms being the most common pathogens in contaminated rivers and streams (Kim et al, 2013;Liu et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Microbiota sampled from a polluted stream in Recife-PE, Brazil and its importance to public health

PurificaÃ§ao¹,

Araujo²,

Lópes³

et al. 2017

Afr. J. Microbiol. Res.

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Pollution of water bodies can cause environmental and public health problems. The Cavouco stream is a tributary of the Capibaribe River, one of the main rivers in the state of Pernambuco, Brazil, and receives a high pollution load from residential, laboratory and hospital effluents. The aim of the present study was to perform phenotypic and molecular characterization in this stream, and evaluate the water quality using microbiological parameters. Water was collected from five sampling points, and bacterial species were identified using biochemical and molecular methods through 16S rRNA gene sequence analysis. Total and thermotolerant coliforms were also quantified. Fermenting Gram-negative bacilli from the family Enterobacteriaceae (Escherichia coli, Klebsiella pneumoniae and Proteus mirabilis), non-fermenting bacilli (Pseudomonas aeruginosa and Pseudomonas putida) and Gram-positive bacilli (Bacillus cereus, Bacillus licheniformis, Bacillus pumilus and Staphylococcus hominis) were identified. A total of 25 bacterial isolates were phenotypically identified. All phenotypic identifications were confirmed by molecular analysis, except for S. hominis, which was molecularly identified as Exiguobacterium. Regarding water quality, all analyzed samples were positive for total and thermotolerant coliforms. The results obtained suggest that the Cavouco stream presents a potential risk for transmission of water-borne diseases, because of the presence of pathogenic bacteria. In addition, the current state of the stream also threatens the conservation of its native species.

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Modeling fecal coliform contamination in a tidal Danshuei River estuarine system

Cited by 35 publications

References 31 publications

Spatial and temporal distribution of thermotolerant coliform in Canal de Passagem (Vitória - ES) - related to physico-chemical parameters and tide

Spatial and temporal distribution of thermotolerant coliform in Canal de Passagem (Vitória - ES) - related to physico-chemical parameters and tide

Assessing the impact of socio-economic development and climate change on faecal indicator bacteria in the Betna River, Bangladesh

Microbiota sampled from a polluted stream in Recife-PE, Brazil and its importance to public health

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