Distribution of Asellus aquaticus and microinvertebrates in a non-chlorinated drinking water supply system – Effects of pipe material and sedimentation

Christensen, Sarah Christine Boesgaard; Nissen, Erling; Arvin, Erik; Albrechtsen, Hans‐Jørgen

doi:10.1016/j.watres.2011.03.039

Cited by 46 publications

(39 citation statements)

References 10 publications

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“…Most of the regrowth problems seem to relate to biofilms, since opportunistic pathogens like L. pneumophila are known to multiply in biofilms, 37 animal vertebrates graze (in)directly on biofilms, 6,7 and microbial induced corrosion is caused by growth of certain bacteria (e.g. sulphate reducing bacteria) in biofilms.…”

Section: Discussionmentioning

confidence: 99%

A survey of indicator parameters to monitor regrowth in unchlorinated drinking water

Wielen

Bakker

Atsma

et al. 2016

Environ. Sci.: Water Res. Technol.

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The objective of our study was to explore microbiological parameters that are suitable as indicators for regrowth in distribution systems that receive unchlorinated drinking water in the Netherlands. Treated water and distributed water at two locations in the distribution system of 28 treatment plants were analyzed for a range of biological parameters. The results demonstrated that Aeromonas, HPCs, and Mycobacterium were significantly (more often) higher and ATP was significantly (more often) lower in the distributed water than in the treated water, whereas cell numbers remained stable during distribution. Average fungal 18S rRNA gene copies did not differ significantly between the treated and the distributed water, but fungal numbers were significantly more often higher in the distributed water than in the corresponding treated water. These results demonstrate that the distribution system has a clear effect on HPCs, Aeromonas, Mycobacterium, ATP and, to a lesser extent, on fungi in drinking water, but not on cell numbers. Furthermore, we noticed that ATP in the treated water is a better predictor for the regrowth level in the distribution system than total, membrane-intact or HNA cell numbers. In contrast to previous studies, we conclude that ATP and cell numbers seem to be poor indicators for regrowth in the drinking water environment, whereas HPCs, Aeromonas, Mycobacterium and, to a lesser extent, fungi appear to be more reliable indicators to monitor regrowth.

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Section: Discussionmentioning

confidence: 99%

A survey of indicator parameters to monitor regrowth in unchlorinated drinking water

Wielen

Bakker

Atsma

et al. 2016

Environ. Sci.: Water Res. Technol.

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“…Some recent reports have been published on the situation in the Netherlands (Van Lieverloo et al, 2004), Denmark (Christensen et al, 2011b(Christensen et al, , 2012 and Germany (Gunkel and Scheideler, 2011).…”

Section: Introductionmentioning

confidence: 99%

On the way to identify microorganisms in drinking water distribution networks via DNA analysis of the gut content of freshwater isopods

Mayer

Keller

Szewzyk

et al. 2015

Journal of Biotechnology

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“…The water louse Asellus aquaticus (Isopoda) is frequently found in drinking water distribution systems in temperate parts of the world (e.g., [1,2,3,4]). When A. aquaticus or other invertebrate animals enter a drinking water distribution system, they may be contaminated with bacteria, which can affect human health [5].…”

Section: Introductionmentioning

confidence: 99%

Asellus aquaticus as a Potential Carrier of Escherichia coli and Other Coliform Bacteria into Drinking Water Distribution Systems

Christensen

Arvin

Nissen³

et al. 2013

IJERPH

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Individuals of the water louse, Asellus aquaticus, enter drinking water distribution systems in temperate parts of the world, where they establish breeding populations. We analysed populations of surface water A. aquaticus from two ponds for associated faecal indicator bacteria and assessed the risk of A. aquaticus transporting bacteria into distribution systems. Concentrations of up to two E. coli and five total coliforms·mL−1 were measured in the water and 200 E. coli and >240 total coliforms·mL−1 in the sediments of the investigated ponds. Concentrations of A. aquaticus associated bacteria never exceeded three E. coli and six total coliforms·A. aquaticus−1. During exposure to high concentrations of coliforms, concentrations reached 350 coliforms·A. aquaticus−1. A. aquaticus associated E. coli were only detected as long as E. coli were present in the water and sediment. The calculated probability of exceeding drinking water guideline values in non-disinfected systems by intrusion of A. aquaticus was low. Only in scenarios with narrow pipes and low flows, did total coliforms exceed guideline values, implying that the probability of detection by routine monitoring is also low. The study expands the knowledge base for evaluating incidents with presence of coliform indicators in drinking water by showing that intruding A. aquaticus were not important carriers of E. coli or other coliform bacteria even when emerging from faecally contaminated waters.

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Distribution of Asellus aquaticus and microinvertebrates in a non-chlorinated drinking water supply system – Effects of pipe material and sedimentation

Cited by 46 publications

References 10 publications

A survey of indicator parameters to monitor regrowth in unchlorinated drinking water

A survey of indicator parameters to monitor regrowth in unchlorinated drinking water

On the way to identify microorganisms in drinking water distribution networks via DNA analysis of the gut content of freshwater isopods

Asellus aquaticus as a Potential Carrier of Escherichia coli and Other Coliform Bacteria into Drinking Water Distribution Systems

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