Field and laboratory studies of Escherichia coli decay rate in subtropical coastal water

Chan, Yu-Ting; Thoe, Wai; Lee, Joseph Hun Wei

doi:10.1016/j.jher.2014.08.002

Cited by 26 publications

(16 citation statements)

References 18 publications

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“…Another factor affecting decay is biological. Biological decay can be led, modulated and minimized by solar radiation, turbidity (radiation attenuation), salinity, predation, temperature, pH, competition, growth under different nutrient conditions, and growth under the release of nutrients from dead cells (Alkan et al, 1995;Beardsley et al, 2003;Bucci et al, 2011;Carrillo et al, 1985;Chan et al, 2015;Davies-Colley et al, 1994, Jozić et al, 2014, Troussellier et al, 1998van Elsas et al, 2011;Yang et al, 2000). Jozić et al (2014) adds to that list variations at the gene level, which can improve bacterial resistance.…”

Section: Decay Factorsmentioning

confidence: 99%

“…In order to assess E. coli T90, researches have been employing an inoculum of bacteria accounting of 10 6 -10 9 CFU/100 mL on assays, where decay is used for the establishment of mathematical expressions (Alkan, 1999;Alkan et al, 1995;Chan et al, 2015;Lothigius et al, 2010;Moriñigo et al; These techniques are performed in microcosm-or mesocosm-scale experiments in the field or under laboratory conditions, but can also be carried out in field monitoring surveys. Rozen (2001) draws attention to the limitations of both field and laboratory experiments: the laboratory experiments cannot simulate the environmental complexity; field studies, used to validate laboratory results, yield site-specific data; and field monitoring surveys lack target population control: most of them ignore the previous growth history of the strains.…”

Section: The Scale Of the Studiesmentioning

confidence: 99%

“…In addition, in order to attain better reliability, the modeling studies have been optimized in field surveys, which calibrated marine currents, tides, wind or added particulate matter, attached and free bacteria settling, and advection/diffusion variables. Several of these models can be examined in the literature (e.g., Chan et al, 2015;Fernández, 2011). Chan et al, (2015) used the same environmental factors as Mancini's, resulting in good accuracy with field data.…”

Section: Modelingmentioning

confidence: 99%

“…Água vol. 13 n. 4, e2106 -Taubaté 2018 (Sinton et al, 2002) Research on E. coli T90 has found values ranging from 2 hours to many days, under both light and dark conditions (Chan et al, 2015;Craig et al, 2004;Jozić et al, 2014;Zhang et al 2015). The large variation is the result of the varying conditions under which these studies were carried out (Alkan et al, 1995;Berney et al, 2006;Craig et al, 2002;2004;Lothigius et al, 2010;Moriñigo et al, 1990;Rozen, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the model must be fed with consistent local parameters (Ozcan, 2002) and rates (Chan et al, 2015) that yield realistic estimations. In outfall modeling, one of the important parameters of the environmental conditions is the time required for 90% of the E. coli to die-off (E. coli T90), and several researchers throughout the world have come up with values for this parameter (Table 1) under various conditions (Chan et al, 2015;Feitosa et al, 2013a;Jozić et al, 2014;Rozen, 2001;Yang et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Critical evaluation of the factors affecting Escherichia coli environmental decay for outfall plume models

Carneiro¹,

Côrtes²,

Wasserman³

2018

Rev. ambiente água

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The Escherichia coli T90 parameter is widely employed in outfall plume hydrodynamic models. Although there is a great deal of academic literature estimating T90, no standard methodology has been validated so far. Estimation of die-off rates should consider many other biological, chemical and physical processes. Over the last three decades, while a great deal of new knowledge about microbial biology and ecology has become available, it has not been fully incorporated into the overall research. Consequently, hydrodynamic models of sewage plumes lack consistency with environmental dynamics and frequently do not fully reproduce processes. This article scrutinized the relevant works that could improve T90 assessment using the most robust and realistic approaches. The most important related literature since the 1990s was considered, together with earlier relevant works. The research focused on techniques and methodologies, especially their ecologic and cellular biology aspects. A brief discussion of the methods applied to evaluate the T90 of bacteria examined aspects like representativeness of incubation, incubation scale, measurement procedures and models' representations of bacterial decay. The factors affecting population decay, such as solar radiation, salinity and interaction with solids, were considered in the light of the very large literature registry. Finally, biological aspects affecting decay, like predation and genetic resistance, were also analyzed. The resulting updated understanding of T90 may contribute to better managerial procedures that could improve water quality in freshwater and coastal systems, and consequently improve human health outcomes.Keywords: bacteria, environmental decay, water quality. modelos hidrodinâmicos, não existe uma padronização metodológica para sua avaliação que seja validada até hoje. Além das taxas de decaimento, muitos outros processos biológicos, químicos e físicos deveriam ser considerados nas modelagens hidrodinâmicas. Nas últimas três décadas, embora um extenso conhecimento sobre biologia e ecologia microbiana tenha sido desenvolvido, pouco deste conhecimento foi incorporado às aplicações. Consequentemente, os modelos de plumas de esgotos não lograram reproduzir de maneira fiel os processos ambientais. No presente artigo, os trabalhos relevantes que poderiam melhorar a determinação do T90, sob abordagens mais robustas e realistas foram revisados. A literatura mais relevante desde os anos 1990 foi considerada, juntamente com alguns trabalhos relevantes mais antigos. A pesquisa focou em técnicas e metodologias de avaliação de aspectos ecológicos e de biologia celular. Uma breve discussão dos métodos aplicados à avaliação do T90 examinou aspectos como a representatividade das incubações, escala dos experimentos de incubação e procedimentos de medição, com ênfase em modelos de decaimento bacteriano. Os fatores que afetam o decaimento bacteriano como radiação solar, salinidade e interação com sólidos foram considerados à luz do extenso registro da literatura. Finalm...

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