Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina

Córdoba, María Alejandra; Coco, Valeria Fernanda Del; Minvielle, Marta Cecilia; Basualdo, Juan Ángel

doi:10.2166/wh.2009.141

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…Bacterial growth in bulk water can be fostered by long residence times that result in the decay of disinfectant residuals, elevated temperatures, and stagnation. − Given the shortened supply periods in IWS systems, residence times of bulk supply are likely low; microbial growth in this phase may then be less of a concern in many IWS than in most CWS systems (although IWS systems with long supply cycles would behave similarly to CWS systems). There have not been any studies of growth in IWS systems.…”

Section: Biofilms Loose Deposits and Microbial Growthmentioning

confidence: 99%

Intermittent Water Supply: Prevalence, Practice, and Microbial Water Quality

Kumpel

Nelson

2016

Environ. Sci. Technol.

203

145

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Intermittent water supplies (IWS), in which water is provided through pipes for only limited durations, serve at least 300 million people around the world. However, providing water intermittently can compromise water quality in the distribution system. In IWS systems, the pipes do not supply water for periods of time, supply periods are shortened, and pipes experience regular flow restarting and draining. These unique behaviors affect distribution system water quality in ways that are different than during normal operations in continuous water supplies (CWS). A better understanding of the influence of IWS on mechanisms causing contamination can help lead to incremental steps that protect water quality and minimize health risks. This review examines the status and nature of IWS practices throughout the world, the evidence of the effect of IWS on water quality, and how the typical contexts in which IWS systems often exist-low-income countries with under-resourced utilities and inadequate sanitation infrastructure-can exacerbate mechanisms causing contamination. We then highlight knowledge gaps for further research to improve our understanding of water quality in IWS.

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Section: Biofilms Loose Deposits and Microbial Growthmentioning

confidence: 99%

Intermittent Water Supply: Prevalence, Practice, and Microbial Water Quality

Kumpel

Nelson

2016

Environ. Sci. Technol.

203

145

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“…Bacterial regrowth has been observed under the diminished presence of disinfectant residuals (i.e., chlorine and chloramine), which is influenced by the complex interactions between chemical and physical parameters including but not limited to temperature, alkalinity, pH, organic matter/humic substances, phosphate, and pipe materials, etc. (5,20,27,42). The chemical disinfection reaction with organic matter can also lead to an increase in assimilable organic carbon (AOC) (10,22,33) and other chemicals termed disinfection byproducts (DBPs) (32).…”

mentioning

confidence: 99%

Microbial Community Dynamics of an Urban Drinking Water Distribution System Subjected to Phases of Chloramination and Chlorination Treatments

Hwang

Ling

Andersen

et al. 2012

Appl Environ Microbiol

135

103

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Water utilities in parts of the U.S. control microbial regrowth in drinking water distribution systems (DWDS) by alternating postdisinfection methods between chlorination and chloramination. To examine how this strategy influences drinking water microbial communities, an urban DWDS (population Х 40,000) with groundwater as the source water was studied for approximately 2 years. Water samples were collected at five locations in the network at different seasons and analyzed for their chemical and physical characteristics and for their microbial community composition and structure by examining the 16S rRNA gene via terminal restriction fragment length polymorphism and DNA pyrosequencing technology. Nonmetric multidimension scaling and canonical correspondence analysis of microbial community profiles could explain >57% of the variation. Clustering of samples based on disinfection types (free chlorine versus combined chlorine) and sampling time was observed to correlate to the shifts in microbial communities. Sampling location and water age (<21.2 h) had no apparent effects on the microbial compositions of samples from most time points. Microbial community analysis revealed that among major core populations, Cyanobacteria, Methylobacteriaceae, Sphingomonadaceae, and Xanthomonadaceae were more abundant in chlorinated water, and Methylophilaceae, Methylococcaceae, and Pseudomonadaceae were more abundant in chloraminated water. No correlation was observed with minor populations that were detected frequently (<0.1% of total pyrosequences), which were likely present in source water and survived through the treatment process. Transient microbial populations including Flavobacteriaceae and Clostridiaceae were also observed. Overall, reversible shifts in microbial communities were especially pronounced with chloramination, suggesting stronger selection of microbial populations from chloramines than chlorine.

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“…The removal and monitoring of microorganisms can avoid disease outbreaks caused by the presence of pathogens in the water. Previous report demonstrated that the proportion of injured coliforms fluctuated between 70 and 100% in the test samples of the chlorine disinfection drinking water distribution system (Córdoba et al 2010), while those in water samples from filtered backflow of drinking water and damaged municipal pipelines accounted for up to 90% (Bissonnette et al 1975;Means et al 1981). Ray (1979) believed that the permeability barrier of injured cells is impaired, which makes them more susceptible to structural injury caused by various selective compounds.…”

Section: Existence and Threat Of Disinfectant-injured Bacteriamentioning

confidence: 99%

Research progress on the injury mechanism and detection method of disinfectant-injured Escherichia coli in the drinking water system

Feng

Zhu

Jin

et al. 2021

Journal of Water Supply: Research and Technology-Aqua

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Sublethally injured bacteria can still develop into normal bacteria under favorable growth conditions, and their pathogenicity poses a great threat to human health. In the drinking water system, some bacteria cause sublethal injury under the action of disinfectants, that is, disinfectant-injured bacteria. Hence, the detection of disinfectant-injured bacteria and the elucidation of injury mechanisms are of great significance for ensuring the microbial safety of drinking water systems. This article takes the indicator bacteria Escherichia coli as the research object, reviews and summarizes the sublethal injury conditions, damage mechanism, and detection methods of disinfectant-injured bacteria in drinking water, and puts forward a prospect for the future research directions of drinking water disinfection and disinfectant-injured bacteria.

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Influencing factors in the occurrence of injured coliforms in the drinking water distribution system in the city of La Plata, Argentina

Cited by 6 publications

References 18 publications

Intermittent Water Supply: Prevalence, Practice, and Microbial Water Quality

Intermittent Water Supply: Prevalence, Practice, and Microbial Water Quality

Microbial Community Dynamics of an Urban Drinking Water Distribution System Subjected to Phases of Chloramination and Chlorination Treatments

Research progress on the injury mechanism and detection method of disinfectant-injured Escherichia coli in the drinking water system

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