Investigation of assimilable organic carbon (AOC) and bacterial regrowth in drinking water distribution system

Liu, W; Wu, Hanjing Emily; Wang, Z; Ong, Say Leong; Hu, Jiangyong; Ng, W.J.

doi:10.1016/s0043-1354(01)00296-2

Cited by 149 publications

(77 citation statements)

References 10 publications

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“…1a), which should be the corroded particles agglomerated and loosely covered with bacteria cells. The observation was comparable with that of corroded cast iron coupons under chlorine residue in water (Liu et al, 2002;Wang et al, 2011). The inner surface of PVC faucet was covered with a layer of extracellular matrix material (Fig.…”

Section: Morphology Of the Biofilmssupporting

confidence: 80%

Molecular analysis of long-term biofilm formation on PVC and cast iron surfaces in drinking water distribution system

Liu

Zhu

et al. 2014

Journal of Environmental Sciences

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a b s t r a c tTo understand the impacts of different plumbing materials on long-term biofilm formation in water supply system, we analyzed microbial community compositions in the bulk water and biofilms on faucets with two different materials-polyvinyl chloride (PVC) and cast iron, which have been frequently used for more than10 years. Pyrosequencing was employed to describe both bacterial and eukaryotic microbial compositions. Bacterial communities in the bulk water and biofilm samples were significantly different from each other. Specific bacterial populations colonized on the surface of different materials. Hyphomicrobia and corrosion associated bacteria, such as Acidithiobacillus spp., Aquabacterium spp., Limnobacter thiooxidans, and Thiocapsa spp., were the most dominant bacteria identified in the PVC and cast iron biofilms, respectively, suggesting that bacterial colonization on the material surfaces was selective. Mycobacteria and Legionella spp. were common potential pathogenic bacteria occurred in the biofilm samples, but their abundance was different in the two biofilm bacterial communities. In contrast, the biofilm samples showed more similar eukaryotic communities than the bulk water. Notably, potential pathogenic fungi, i.e., Aspergillus spp. and Candida parapsilosis, occurred in similar abundance in both biofilms. These results indicated that microbial community, especially bacterial composition was remarkably affected by the different pipe materials (PVC and cast iron).

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Section: Morphology Of the Biofilmssupporting

confidence: 80%

Molecular analysis of long-term biofilm formation on PVC and cast iron surfaces in drinking water distribution system

Liu

Zhu

et al. 2014

Journal of Environmental Sciences

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“…However, acetate-C concentrations did not change significantly between the systems (average values 58-83 µg acetate-C/l). It has to be remembered that there are variations in the concentrations of AOC in different distribution systems and seasons due to operational changes in the water treatment (Liu et al 2002). However, in many waterworks there is lack of information about concentration of AOC, since in legislation, only the measurement of total organic carbon (TOC) is required.…”

Section: Discussionmentioning

confidence: 99%

Drinking Water Quality in Distribution Systems of Surface and Ground Waterworks in Finland

Ikonen¹,

Hokajärvi²,

Heikkinen³

et al. 2017

Journal of Water Security

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Abstract. Physico-chemical and microbiological water quality in the drinking water distribution systems (DWDSs) of five waterworks in Finland with different raw water sources and treatment processes was explored. Water quality was monitored during four seasons with on-line equipment and bulk water samples were analysed in laboratory. Seasonal changes in the water quality were more evident in DWDSs of surface waterworks compared to the ground waterworks and artificially recharging ground waterworks (AGR). Between seasons, temperature changed significantly in every system but pH and EC changed only in one AGR system. Seasonal change was seen also in the absorbance values of all systems. The concentration of microbially available phosphorus (MAP, μg PO₄-P/l) was the highest in drinking water originating from the waterworks supplying groundwater. Total assimilable organic carbon (AOC, μg AOC-C/l) concentrations were significantly different between the DWDSs other than between the two AGR systems. This study reports differences in the water quality between surface and ground waterworks using a wide set of parameters commonly used for monitoring. The results confirm that every distribution system is unique, and the water quality is affected by environmental factors, raw water source, treatment methods and disinfection.

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“…Les cellules microbiennes présentes dans les biofilms sont enchevêtrées au sein d'une matrice de substances polymériques telles que des saccharides, des acides nucléiques et des protéines (SUTHERLAND, 2001). En plus des polymères secrétés, la matrice des biofilms peut être composée de nutriments adsorbés, de produits de cellules lysées ainsi que des particules de matériaux et de détritus provenant de l'environnement immédiat (FLEMMING, 2002;LIU et al, 2002;MARTINy et al, 2003;RIDGwAy et OLSON, 1981). Les composés présents dans la matrice extracellulaire peuvent donc constituer une source de nutriments pour les cellules microbiennes présentes dans les biofilms (SUTHERLAND, 2001).…”

Section: Les Relations Structures-fonctionsunclassified

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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Investigation of assimilable organic carbon (AOC) and bacterial regrowth in drinking water distribution system

Cited by 149 publications

References 10 publications

Molecular analysis of long-term biofilm formation on PVC and cast iron surfaces in drinking water distribution system

Molecular analysis of long-term biofilm formation on PVC and cast iron surfaces in drinking water distribution system

Drinking Water Quality in Distribution Systems of Surface and Ground Waterworks in Finland

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

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