A new method to assess the influence of migration from polymeric materials on the biostability of drinking water

Bucheli‐Witschel, Margarete; Kötzsch, Stefan; Darr, Stephan; Widler, Roland; Egli, Thomas

doi:10.1016/j.watres.2012.05.008

Cited by 61 publications

(60 citation statements)

References 31 publications

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“…Results showed that after 24 h of incubation, 0.17, 0.62, and 0.83 mg/L of total organic carbon (TOC) from polyethylene silane cross-linked (PEXb), polybutylene (PB), and EPDM with 2% of plasticizer (EPDM 2%), respectively, were released, indicating that migration of organic matter, depends on polymeric materials. Although migrated organic matter could promote microbial regrowth [12], little is known about the impacts of migrated organic matter on indigenous microbial communities in drinking water.…”

Section: Introductionmentioning

confidence: 99%

Impacts of Organic Matter Migrating from Pipe Materials on Microbial Regrowth in Drinking Water

Rahmatika

Kasuga

Kurisu

et al. 2020

J. of Wat. & Envir. Tech.

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Polymeric materials are widely used in premise plumbing. To assess the potential of pipe materials to promote microbial regrowth in drinking water, we incubated drinking water in a new cross-linked polyethylene pipe (N-PEX), a new steel pipe lined with powdered polyethylene (N-SPE), and an old steel pipe lined with powdered polyethylene (O-SPE). As a reference, we also incubated drinking water in a carbon-free glass bottle (REF). Free chlorine rapidly depleted to below the quantification limit in the pipe incubations. While the original drinking water contained 0.4 mg C/L of dissolved organic carbon (DOC), the DOC concentration in N-PEX, N-SPE and O-SPE increased to 5.2, 3.1 and 1.7 mg C/L, respectively, after 8 days of incubation. The total cell count (TCC) in N-PEX, N-SPE, and O-SPE increased from <10 3 cells/mL to 6.0 × 10 5 , 2.8 × 10 5 , and 3.6 × 10 6 cells/mL after 8 days of incubation, respectively. On the other hand, the TCC in REF increased to 1.4 × 10 5 cells/mL after 14 days of incubation. Dominant bacterial groups were different under the different incubation conditions. These results indicated that organic matter migrating from pipe materials promote microbial regrowth and affect the microbial community composition in drinking water.

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Section: Introductionmentioning

confidence: 99%

Impacts of Organic Matter Migrating from Pipe Materials on Microbial Regrowth in Drinking Water

Rahmatika

Kasuga

Kurisu

et al. 2020

J. of Wat. & Envir. Tech.

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“…For example, increased water temperature can accelerate chlorine decay and favor bacteria growth [19], [31], while changes in hydraulic conditions can alter nutrient supply for microorganisms in biofilms and/or bacteria detachment from the pipe surfaces [32], [33]. Finally, the quality of materials in contact with drinking water, as well as the presence of sediments and loose deposits, can both affect the general microbial quality of the water [6], [34], [35].…”

Section: Introductionmentioning

confidence: 99%

Biological Instability in a Chlorinated Drinking Water Distribution Network

et al. 2014

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The purpose of a drinking water distribution system is to deliver drinking water to the consumer, preferably with the same quality as when it left the treatment plant. In this context, the maintenance of good microbiological quality is often referred to as biological stability, and the addition of sufficient chlorine residuals is regarded as one way to achieve this. The full-scale drinking water distribution system of Riga (Latvia) was investigated with respect to biological stability in chlorinated drinking water. Flow cytometric (FCM) intact cell concentrations, intracellular adenosine tri-phosphate (ATP), heterotrophic plate counts and residual chlorine measurements were performed to evaluate the drinking water quality and stability at 49 sampling points throughout the distribution network. Cell viability methods were compared and the importance of extracellular ATP measurements was examined as well. FCM intact cell concentrations varied from 5×103 cells mL−1 to 4.66×105 cells mL−1 in the network. While this parameter did not exceed 2.1×104 cells mL−1 in the effluent from any water treatment plant, 50% of all the network samples contained more than 1.06×105 cells mL−1. This indisputably demonstrates biological instability in this particular drinking water distribution system, which was ascribed to a loss of disinfectant residuals and concomitant bacterial growth. The study highlights the potential of using cultivation-independent methods for the assessment of chlorinated water samples. In addition, it underlines the complexity of full-scale drinking water distribution systems, and the resulting challenges to establish the causes of biological instability.

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“…For instance, expanded water temperature can quicken chlorine decomposition and support microscopic organisms development (Van der Wielen and Van der Kooij, 2010;Jjemba et al, 2010), while changes in hydraulic conditions may modify the nutrient availability to microorganisms in biofilms and/or bacteria separation from the pipe surfaces (Lehtola et al, 2006;Manuel et al, 2007). Moreover, the nature of materials in contact with drinking water, and in addition the vicinity of residue and sediments, can both influence the general microbial nature of the water (Liu et al, 2013;Bucheli-Witschel et al, 2012;Douterelo et al, 2014).…”

Section: Figure 1 Diagram Showing Distribution System Of City Water mentioning

confidence: 99%

Determination of the Microbiological Quality of Feed City Water to Pharmaceutical Facility: Distribution Study and Statistical Analysis

Eissa¹

2017

AJS

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Supplying feeding water to pharmaceutical plant is critical both for industrial or human consumption purposes. Assessment of microbiological quality and stability is needed to determine the suitability of income city water for human application and other processing in pharmaceutical manufacturing. In the current study statistical analysis and Shewhart charts were used to determine the degree of compliance of the raw city water to the standard microbiological specifications. Although all sampling points of the distribution system met the acceptance criteria, they showed variable degrees of out-of-control states at chronologically non-identical parts of the control charts. The performance of each monitored compartment could be measured by a bioburden level which might provide indication for the disinfection efficacy. The overall capability of the process (Ppk) for each segment of the distribution system was found in the following descending order: water station (2.30), restaurant (2.25), laboratory locker (2.08) and production locker (1.86). Despite the presence of residual chlorine level, the distribution system showed variable degrees of biological instability. Thus, disinfection of feed water cannot be used as a sole measure for protection of aged distribution network and further investigation is required to improve the system quality and maintenance in demand of delivering microbiologically high quality and safe water.

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A new method to assess the influence of migration from polymeric materials on the biostability of drinking water

Cited by 61 publications

References 31 publications

Impacts of Organic Matter Migrating from Pipe Materials on Microbial Regrowth in Drinking Water

Impacts of Organic Matter Migrating from Pipe Materials on Microbial Regrowth in Drinking Water

Biological Instability in a Chlorinated Drinking Water Distribution Network

Determination of the Microbiological Quality of Feed City Water to Pharmaceutical Facility: Distribution Study and Statistical Analysis

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