Removal of soft deposits from the distribution system improves the drinking water quality

Lehtola, Markku J.; Nissinen, Tarja; Miettinen, Ilkka T.; Martikainen, Pertti J.; Vartiainen, Terttu

doi:10.1016/j.watres.2003.10.054

Cited by 102 publications

(69 citation statements)

References 22 publications

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“…Drinking water quality deteriorates during collection and storage (Andrew et al 2005) as well as in distribution networks (Lehtola et al 2004;Karavoltsos et al 2008). It, therefore, becomes imperative to monitor water quality at each stage of treatment.…”

Section: Introductionmentioning

confidence: 99%

Changes in water quality in the Owabi water treatment plant in Ghana

et al. 2014

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The study was conducted on the status of the quality of water from the Owabi water treatment plant that supplies drinking water to Kumasi, a major city in Ghana, to ascertain the change in quality of water from source to point-of-use. Physico-chemical, bacteriological water quality parameters and trace metal concentration of water samples from five different treatment points from the Owabi water treatment plant were investigated. The raw water was moderately hard with high turbidity and colour that exceeds the WHO guideline limits. Nutrient concentrations were of the following order: NH 3 \ NO 2 -\ -NO 3 -\ PO 4 3-\ SO 4 2-and were all below WHO permissible level for drinking water in all the samples at different stages of treatment. Trace metal concentrations of the reservoir were all below WHO limit except chromium (0.06 mg/L) and copper (0.24 mg/L). The bacteriological study showed that the raw water had total coliform (1,766 cfu/100 mL) and faecal coliform (257 cfu/100 mL) that exceeded the WHO standard limits, rendering it unsafe for domestic purposes without treatment. Colour showed strong positive correlation with turbidity (r = 0.730), TSS (r C 0.922) and alkalinity (0.564) significant at p \ 0.01. The quality of the treated water indicates that colour, turbidity, Cr and Cu levels reduced and fall within the WHO permissible limit for drinking water. Treatment process at the water treatment plant is adjudged to be good.

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Section: Introductionmentioning

confidence: 99%

Changes in water quality in the Owabi water treatment plant in Ghana

et al. 2014

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“…Counteracting the effects of secondary contamination is mainly based on more or less advanced methods of flushing and cleaning the distribution network [5,15]. Among the latter, the first to be indicated is loss of large amount of water being in water supply system, and in many cases, the necessity of temporary shut-down parts of the network.…”

Section: Previous Methods To Prevent and Counteract The Phenomenon Ofmentioning

confidence: 99%

“…In addition, after 1990 there was a sharp increase in the length of pipes' of exploited systems -from about 93 thousands km in 1990 to about 273 thousand km in 2010. Both these factors resulted in elongation of the time of water transport from the point of intake to the receiver [15,16], with all its negative results as the following: precipitation of sludge [17,18], microbiological risks [19,20] or intensification of pipes' material impact on the transferred water quality [21][22][23][24]. Research conducted in Poland confirmed exceeding many factors of pollution in the water transported by water supply systems as a result of secondary contamination.…”

Section: Introductionmentioning

confidence: 99%

Water Quality Correction Within Water Distribution System

Kowalski

Kowalska

Hołota

et al. 2015

Ecological Chemistry and Engineering S

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Abstract:Water suppliers can be treated as production companies whose main product is water delivered to their customers. The article presents problems connected with management of such companies in the conditions of secondary contamination in water distribution systems. This phenomenon exists in water networks all over the world. Its' presence is particularly visible in countries of former communistic block. In the article particular attention was devoted to the issue of water quality correction in the analysed systems. In the case of water distribution systems, former quality correction methods consisted in special treatment of water pumped into the system, flushing and cleaning of water pipes. In both these cases identification of water quality deficiencies resulted in significant water loss. The situation reflects management processes applied in the manufacturing industry of the 1940s. The authors of this paper put forward the concept of three water quality correction methods which would not entail such considerable water loss. The methods in question are intended for different network types. The implementation of proposed solutions could set new standards in management of distribution systems of water providers.

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“…La maturation du biofilm va engendrer la formation d'agrégats cellulaires, recouvrant de manière hétérogène la surface, formant ainsi une architecture microbienne tridimensionnelle (COSTERTON et al, 1987;COSTERTON et al, 1994;STOODLEy et al, 2002a;wIMPENNy et al, 2000). Au cours de la croissance du biofilm, des détachements de cellules microbiennes peuvent se produire sous l'action de différents mécanismes tels que l'érosion par des forces de cisaillement, l'abrasion causée par la collision avec des particules, la desquamation d'une fraction du biofilm, la prédation de certaines espèces bactérivores, une carence en nutriments, ou bien l'intervention de l'homme par le nettoyage des ouvrages (HUNT et al, 2004;LEHTOLA et al, 2004;ROCHEX et al, 2009;TELGMANN et al, 2004;vAN LOOSDRECHT et al, 1995;zACHEUS et al, 2001). Lorsque des cellules sont relarguées dans le milieu environnant, elles peuvent éventuellement reprendre un mode de vie planctonique ou non, et coloniser de nouvelles niches écologiques (STOODLEy et al, 2002a).…”

Section: Le Développement Des Biofilmsunclassified

“…Ainsi, ces dispositifs permettent un échantillonnage régulier et répétable des populations microbiennes fixées à la surface de matériaux en contact avec l'eau potable. De cette manière, il a été montré que l'ensemble des matériaux métalliques (l'acier, le cuivre et la fonte), organiques (le chlorure de polyvinyle, le polyéthylène, le polypropylène et le caoutchouc) et composites (le béton et les résines époxy), au contact avec l'eau potable, sont potentiellement générateurs de biofilms (CLOETE et al, 2003;FLEMMING, 2002;HALLAM et al, 2001;LEHTOLA et al, 2004;NIqUETTE et al, 2000;PERCIvAL et al, 1999;SIMõES et al, 2006;vAN DER KOOIJ et al, 2003). La densité cellulaire pouvant être dénombrée au sein d'échantillons de biofilms formés à la surface de matériaux en contact avec l'eau potable peut être comprise entre 10 4 et 10 9 cellules par cm 2 (CLOETE et al, 2003;DELAHAyE 2004;LANGMARK et al, 2005;PAqUIN et al, 1992;PERCIvAL et al, 1999).…”

Section: L'étude Des Biofilms Dans Le Système De Distibution D'eau Pounclassified

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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Removal of soft deposits from the distribution system improves the drinking water quality

Cited by 102 publications

References 22 publications

Changes in water quality in the Owabi water treatment plant in Ghana

Changes in water quality in the Owabi water treatment plant in Ghana

Water Quality Correction Within Water Distribution System

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

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