The effects of water residence time on the biological quality in a distribution network

Kerneis, A.; Nakache, F.; Déguin, A.; Feinberg, M.

doi:10.1016/0043-1354(94)00323-y

Cited by 71 publications

(35 citation statements)

References 16 publications

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“…Malgré les bénéfices de ces ouvrages pour les populations, la conception de tels réseaux a occasionné une augmentation du temps de séjour de l'eau dans les infrastructures. La stagnation de l'eau dans le réseau peut être à l'origine d'une détérioration de la qualité organoleptique de l'eau, d'une diminution de la concentration résiduelle en désinfectant et d'une croissance microbienne dans le système de distribution (KERNEïS et al, 1995;vREEBURG et BOXALL, 2007). Les conditions hydrodynamiques conditionnent le transport des cellules microbiennes, de l'oxygène et l'intensité des forces de cisaillement.…”

Section: Les Conditions Hydrodynamiquesunclassified

Le réseau de distribution d’eau potable : un écosystème complexe lié à des enjeux de santé publique

Poitelon

Joyeux

Welté

et al. 2012

rseau

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L’émergence de pathogènes dans l’eau destinée à la consommation humaine représente une préoccupation majeure en matière de santé publique pour les industriels et les pouvoirs publics concernés. Parmi ces pathogènes, certains sont d’origine fécale (Cryptosporidium, Campylobacter ou bien les rotavirus), alors que d’autres vivent dans l’environnent naturel (Legionella, Pseudomonas, Aeromonas ou bien les mycobactéries). Dans l’optique de mettre en place une analyse des risques liés à la présence de ces pathogènes, il est important d’accroître nos connaissances sur l’écologie de ces microorganismes et de développer des outils d’analyse afin de réaliser une meilleure surveillance sanitaire. Par conséquent, l’écologie microbienne du réseau de distribution d’eau potable doit être étudiée en détail, particulièrement vis-à-vis des propriétés physiologiques et la diversité des espèces microbiennes présentes, afin de mieux comprendre les interactions entre les espèces communément rencontrées et celles pathogènes.The emergence of pathogens in water intended for human consumption is a major concern in terms of the public health industry and the public authorities concerned. Among these pathogens, some are of faecal origin (Cryptosporidium, Campylobacter, or rotavirus), while others live in the natural environment (Legionella, Pseudomonas, Aeromonas or mycobacteria). In order to establish a risk analysis related to the presence of these pathogens, it is important to increase our knowledge on the ecology of these microorganisms and to develop analytical tools to achieve better health monitoring. Therefore, the microbial ecology of drinking water distribution networks must be studied in detail, especially with respect to the properties and physiological diversity of the microbial species present, in order to better understand the interactions between species commonly encountered and those that are pathogens

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Section: Les Conditions Hydrodynamiquesunclassified

Le réseau de distribution d’eau potable : un écosystème complexe lié à des enjeux de santé publique

Poitelon

Joyeux

Welté

et al. 2012

rseau

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“…This factor involves not only tempéra-ture but also changes of raw water quality due to the weather. The passage of water in réservoirs and pipes has often been observed to hâve distinct impacts on water quality (CLARK et al, 1991;KERNEÏS et al, 1995). The origin of water was also seen to influence microbial regrowth.…”

Section: Sélection Of the Process Control Parameter For Monitoring Thmentioning

confidence: 99%

A colony count model for the control of drinking water distribution systems

Kerneis¹,

Déguin²,

Feinberg³

2005

rseau

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The purpose of this study is to select a process control parameter for monitoring microbial regrowth in a network and to develop a more accurate and relevant quality control of supply water. Two parameters were examined as potential process control parameters: the water residence time in the network and the concentration of biodegradable organic matter. Residence time calculations were carried out and validated by tracer studies in a branched network and then in a simply looped network. The measurement of the natural dissolved organic carbon (DOC) consumption in the network was preferred to the determination of any in vitro biodegradation. The measurement of consumption requires the determination of DOC in treated water and in supply water. It is simpler and less expensive than other biodegradable organic matter determinations. A model for colony counts as a function of the residence time was developed in order to demonstrate that this parameter can be used for process controlling. This model was very well adjusted to data collected in a network in winter, spring and summer. This process control parameter was then used in order to locate and estimate the quantity of water whose colony counts exceed the European directive guide level. Accurate correlation measurements between colony counts and DOC consumed in the network were carried out in three distinct systems. No significant correlations were measured. For these three networks, biodegradable organic matter measurements based on DOC determinations were demonstrated to be unreliable process control parameters for monitoring bacterial regrowth.

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“…Since it is assumed that reservoirs are completely mixed reactors (Kerneïs et al, 1995), theoretical residence time (TRT) is often defined as water volume divided by inflow or outflow rate (Kawara et al, 1998;Renella and Quiró s, 2006). Depending on which flow rate dominates water status, TRT can be expressed as…”

Section: Estimation Of Water Residence Timementioning

confidence: 99%

Examination of Critical Factors Related to Summer Chlorophyll a Concentration in the Sueo Dam Reservoir, Republic of Korea

Lee¹,

Lee

Kim

et al. 2012

Environmental Engineering Science

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This study examined critical factors related to the short-term variation of algae growth in reservoirs during the summer. To this end, statistical tests were carried out at a small dam reservoir to determine how chemical factors (e.g., nutrient concentrations) and physical factors (e.g., theoretical and relative residence times, temperature) influenced the chlorophyll a (Chl-a) concentration. Statistical tests revealed that, although phosphorus (P) concentration was significant for Chl-a, residence time had much stronger relationship to Chl-a concentration than chemical factors. In addition, the study verified that relative residence time (RRT) best explained the relation of water status to algae growth. RRT was found to be useful in identifying water status related to the summer algae bloom. Finally, this study raised the possibility of inhibiting summer algae growth by operating dam reservoirs moderately. These findings need to be seriously considered when reservoir operators establish effective strategies for water quality management in summer.

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The effects of water residence time on the biological quality in a distribution network

Cited by 71 publications

References 16 publications

Le réseau de distribution d’eau potable : un écosystème complexe lié à des enjeux de santé publique

Le réseau de distribution d’eau potable : un écosystème complexe lié à des enjeux de santé publique

A colony count model for the control of drinking water distribution systems

Examination of Critical Factors Related to Summer Chlorophyll a Concentration in the Sueo Dam Reservoir, Republic of Korea

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