Biofilm development in potable quality water

Percival, Steven; Knapp, J. S.; Wales, D. S.; Edyvean, R.G.J.

doi:10.1080/08927019909378385

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…Biofilms formed in pipe walls used for potable water distribution are known to give birth to serious public health problems by protecting and supporting pathogenic microorganisms [1][2][3]. Several groups have investigated the complexity and diversity of these biofilms to clarify bacteria involved in these problems [4][5][6] and such knowledge may provide new tools for improving water quality for the consumer [7].…”

Section: Introductionmentioning

confidence: 99%

In situ detection and characterization of potable water biofilms on materials by microscopic, spectroscopic and electrochemistry methods

Gamby

Pailleret

Clodic

et al. 2008

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

In situ detection and characterization of potable water biofilms on materials by microscopic, spectroscopic and electrochemistry methods

Gamby

Pailleret

Clodic

et al. 2008

Electrochimica Acta

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“…Bacterial adhesion forms the basis for several diverse problems in medicine (5,10,21,38), industry (3,15,29,32), and environmental areas (8,33). The most detrimental effects are encountered in medicine, where failure of implanted devices may result from surface-associated bacterial infections.…”

mentioning

confidence: 99%

Analysis of Bacterial Detachment from Substratum Surfaces by the Passage of Air-Liquid Interfaces

Gómez‐Suárez

Busscher

Mei

2001

Appl Environ Microbiol

189

150

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A theoretical analysis of the detachment of bacteria adhering to substratum surfaces upon the passage of an air-liquid interface is given, together with experimental results for bacterial detachment in the absence and presence of a conditioning film on different substratum surfaces. Bacteria (Streptococcus sobrinus HG1025, Streptococcus oralis J22, Actinomyces naeslundii T14V-J1, Bacteroides fragilis 793E, and Pseudomonas aeruginosa 974K) were first allowed to adhere to hydrophilic glass and hydrophobic dimethyldichlorosilane (DDS)-coated glass in a parallel-plate flow chamber until a density of 4 ؋ 10 6 cells cm ؊2 was reached. For S. sobrinus HG1025, S. oralis J22, and A. naeslundii T14V-J1, the conditioning film consisted of adsorbed salivary components, while for B. fragilis 793E and P. aeruginosa 974K, the film consisted of adsorbed human plasma components. Subsequently, air bubbles were passed through the flow chamber and the bacterial detachment percentages were measured. For some experimental conditions, like with P. aeruginosa 974K adhering to DDS-coated glass and an air bubble moving at high velocity (i.e., 13.6 mm s ؊1 ), no bacteria detached upon passage of an air-liquid interface, while for others, detachment percentages between 80 and 90% were observed. The detachment percentage increased when the velocity of the passing air bubble decreased, regardless of the bacterial strain and substratum surface hydrophobicity involved. However, the variation in percentages of detachment by a passing air bubble depended greatly upon the strain and substratum surface involved. At low air bubble velocities the hydrophobicity of the substratum had no influence on the detachment, but at high air bubble velocities all bacterial strains were more efficiently detached from hydrophilic glass substrata. Furthermore, the presence of a conditioning film could either inhibit or stimulate detachment. The shape of the bacterial cell played a major role in detachment at high air bubble velocities, and spherical strains (i.e., streptococci) detached more efficiently than rod-shaped organisms. The present results demonstrate that methodologies to study bacterial adhesion which include contact with a moving air-liquid interface (i.e., rinsing and dipping) yield detachment of an unpredictable number of adhering microorganisms. Hence, results of studies based on such methodologies should be referred as "bacterial retention" rather than "bacterial adhesion".

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“…The rises in turbidity in the water distribution system as a result of bacterial growth and iron release have been extensively analyzed in several studies [9][10][11][12][13][14][15]. However, few studies have addressed the effects of organic macromolecules and their conformations on turbidity [16].…”

Section: Introductionmentioning

confidence: 99%

Turnover mechanisms of organic conformation on turbidity in drinking water

Runsheng

Chunwei

Zhang

et al. 2007

Front.Environ.Sci.Eng.China

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The turbidity variation in artificial water and samples from a water plant was investigated in the presence of organics with different relative molecular mass. The results show that recessive turbidity existed when water chemical conditions were changing. The formation of turbidity depended on organic relative molecular mass and their conformations on particles. At higher pH and lower ionic strength, the organic chains with a more extended conformation resulted in rising turbidity of the suspension. At lower pH, the reconformation of organics took place due to charge neutralization by the proton, resulting in a decline in turbidity. The addition of NaCl and MgCl 2 at pH 7.00 also resulted in a decrease of turbidity in the suspension. It is believed that the occurrence of recessive turbidity has a significant influence on the stability of water supply quality.

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Biofilm development in potable quality water

Cited by 8 publications

References 17 publications

In situ detection and characterization of potable water biofilms on materials by microscopic, spectroscopic and electrochemistry methods

In situ detection and characterization of potable water biofilms on materials by microscopic, spectroscopic and electrochemistry methods

Analysis of Bacterial Detachment from Substratum Surfaces by the Passage of Air-Liquid Interfaces

Turnover mechanisms of organic conformation on turbidity in drinking water

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