Factors affecting bulk to total bacteria ratio in drinking water distribution systems

Srinivasan, Soumya; Harrington, Gregory W.; Xagoraraki, Irene; Goel, Ramesh

doi:10.1016/j.watres.2008.04.025

Cited by 98 publications

(67 citation statements)

References 19 publications

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“…It should also be noted that the reactor was operated at a HRT of 2 h, which was much shorter than the time required for doubling the number of bacterial cells in bulk water (about 13 days for bulk TCC and 18 days for bulk HPC). In general, bulk water bacteria may dominate in distribution systems with long HRT (Srinivasan et al, 2008). In our case, it seemed that detachment of biofilm bacteria accounted for the increase in HPC observed in the bulk phase (Table 2 and Fig.…”

Section: 미생물학회지 제51권 제4호mentioning

confidence: 60%

“…Members of the genus Sphingomonas have been commonly isolated from drinking water distribution systems (Koskinen et al, 2000;Srinivasan et al, 2008;McCoy and VanBriesen, 2012). Their presence is known to be associated both with resistance to chlorine disinfectant and with the ability to form biofilms (Vaz-Moreira et al, 2011).…”

Section: Kinetic Properties Of Biofilm Isolatesmentioning

confidence: 99%

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Growth kinetics and chlorine resistance of heterotrophic bacteria isolated from young biofilms formed on a model drinking water distribution system

Park¹,

Kim²,

Oh³

et al. 2015

The Korean Journal of Microbiology

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The present work quantified the growth of young biofilm in a model distribution system that was fed with chlorinated drinking water at a hydraulic retention time of 2 h. Bacterial biofilms grew on the surface of polyvinyl chloride (PVC) slides at a specific growth rate of 0.14 ± 0.09 day -1 for total bacteria and 0.16 ± 0.08 day -1 for heterotrophic bacteria, reaching 3.1 × 10 4 cells/cm 2 and 6.6 × 10 3 CFU/cm 2 after 10 days, respectively. The specific growth rates of biofilm-forming bacteria were found to be much higher than those of bulk-phase bacteria, suggesting that biofilm bacteria account for a major part of the bacterial production in this model system. Biofilm isolates exhibited characteristic kinetic properties, as determined by μmax and KS values using the Monod model, in a defined growth medium containing various amounts of acetate. The lowest μmax value was observed in bacterial species belonging to the genus Methylobacterium, and their slow growth seemed to confer high resistance to chlorine treatment (0.5 mg/L for 10 min). KS values (inversely related to substrate affinity) of Sphingomonas were two orders of magnitude lower for acetate carbon than those of other isolates. The Sphingomonas isolates may have obligate-oligotrophic characteristics, since the lower KS values allow them to thrive under nutrient-deficient conditions. These results provide a better understanding and control of multi-species bacterial biofilms that develop within days in a drinking water distribution system.

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Section: 미생물학회지 제51권 제4호mentioning

confidence: 60%

Section: Kinetic Properties Of Biofilm Isolatesmentioning

confidence: 99%

Growth kinetics and chlorine resistance of heterotrophic bacteria isolated from young biofilms formed on a model drinking water distribution system

Park¹,

Kim²,

Oh³

et al. 2015

The Korean Journal of Microbiology

View full text Add to dashboard Cite

show abstract

“…(1). According to Reynolds' theory, the turbulent shear stress among two layers of a fluid a small distance apart for linear flow is given as: τ = ρu'w' (2) ...where u' and w' are fluctuating components of velocity in the in the x and z direction of flow. The friction co-efficient is related with a ratio between shear velocity and average velocity measured.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Biofilm Growth on Wall Shear Stress in Drinking Water PVC Pipes

Kumarasamy¹,

Maharaj²

2015

Pol. J. Environ. Stud.

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“…Thus, controlling this concentration in drinking water is a very important aspect, since the decrease in its level below that recommended may cause a secondary development of microorganisms [7]. Changes in chlorine residuals can be used as indicators of microbial contamination [8]. Experience has shown that the maintenance of the chlorine residual cannot be relied upon to totally prevent the occurrence of bacteria.…”

Section: Introductionmentioning

confidence: 99%

Combating Accidental Microbial Episodes by Back-Ground Chlorine Residuals in a Scaled-up Distribution Network (Rig) Using a Central Composite Design (CCD)

Rasheed¹,

Hashmi²,

Zhou³

et al. 2015

IJESD

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Factors affecting bulk to total bacteria ratio in drinking water distribution systems

Cited by 98 publications

References 19 publications

Growth kinetics and chlorine resistance of heterotrophic bacteria isolated from young biofilms formed on a model drinking water distribution system

Growth kinetics and chlorine resistance of heterotrophic bacteria isolated from young biofilms formed on a model drinking water distribution system

The Effect of Biofilm Growth on Wall Shear Stress in Drinking Water PVC Pipes

Combating Accidental Microbial Episodes by Back-Ground Chlorine Residuals in a Scaled-up Distribution Network (Rig) Using a Central Composite Design (CCD)

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