Water Quality Variations (WQVs) on Water Distribution Systems in KOREA According to Seasonal Varying Water Temperatures

Won-Sik, Chung; Kim, Dong-Won; Yu, Meilin; Lee, Hyundong

doi:10.1061/40685(2003)144

World Water &Amp;amp; Environmental Resources Congress 2003 2003

DOI: 10.1061/40685(2003)144

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Water Quality Variations (WQVs) on Water Distribution Systems in KOREA According to Seasonal Varying Water Temperatures

Chung Won-Sik¹,

Dong-Won Kim²,

Meilin Yu³

et al.

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Cited by 3 publications

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Field Studies and Modeling Exploring Mean and Maximum Water Age Association to Water Quality in a Drinking Water Distribution Network

Machell

Boxall

2012

J. Water Resour. Plann. Manage.

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This paper presents the findings of an investigation into predicted / modeled water age and the associated quality characteristics within a UK drinking water distribution network to determine if there was a discernable link. Aquis (7-Technologies A/S, Denmark) hydraulic and water quality software were used to identify water volumes of different ages, generated by localized demand patterns in pipes in close proximity to one another. The pipe network studied was small spatially, of a single material, having a consistent demand due to serving predominately light industry, but with interesting hydraulic patterns involving loops and mixing of water volumes, and some long retention times. Field work was undertaken to obtain water quality samples from five network locations identified as containing a broad range of calculated water age. The samples were analyzed for standard regulated parameters by a UKAS (NAMAS) accredited water laboratory in line with UK water industry standard quality assurance practice. The water sample analytical results were examined to see how a number of physical, chemical and bacteriological parameters related to the calculated water age at each sample point, heterotrophic plate counts being used as the indicator of general bacteriological water quality.Limited association between the calculated water mean age and quality parameters was observed. Further investigations, taking into account mixing of different aged water volumes and the maximum age contributions to the mean age at each sample location, produced some association. The work demonstrated that mean age is not a sufficient guide to general water quality in this small network area. Mixing effects, and maximum age volume contributions, need to be taken into account if a more comprehensive understanding of water quality is to be obtained.

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Field Studies and Modeling Exploring Mean and Maximum Water Age Association to Water Quality in a Drinking Water Distribution Network

Machell

Boxall

2012

J. Water Resour. Plann. Manage.

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Modeling and Field Work to Investigate the Relationship between Age and Quality of Tap Water

Machell

Boxall

2014

J. Water Resour. Plann. Manage.

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Article:Machel, J.M. and Boxall, J.B. (2014) Modelling and field work to investigate the relationship between the age and the quality of drinking water at customer's taps. Journal of Water Resources Planning and Management, 140 (9).1 Modeling and field work to investigate the relationship between the age and the quality of drinking water at customer's taps Abstract: It has been widely theorized that water age may be a useful indicator of the quality of water within drinking water distribution networks. However, there is limited evidence of model simulation results being related to empirical water quality (WQ hereafter) data to substantiate the theory. This paper presents the findings of investigations designed to determine if there was an observable relationship between mean water ages calculated using a WQ simulation model, and measured WQ in two live distribution networks.The age of water in all pipes was calculated using Aquis hydraulic and WQ modeling software. Historic regulatory WQ data was examined to determine if there was a relationship between general WQ and calculated water age within the networks. A more detailed study was then undertaken in one network by translating model locations that were representative of the spread of water age into real world locations.WQ samples were taken intensively from these sites and analyzed for a range of aesthetic, physical, chemical, and bacteriological parameters indicative of general WQ.Some relationship between the calculated mean age of water and the general WQ in the network was demonstrated. Analysis that considered calculated water age and associated WQ along unperturbed flow routes through the network produced a stronger relationship. Given that regulatory WQ within the study networks as reported to the Drinking Water Inspectorate (DWI) was 99.9% compliant, this relationship was deemed noteworthy.

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The Geographical Information System (GIS) based water quality assessment of a drinking water distribution system in the Denizli City

Koç¹,

Çiner²,

Toprak³

et al. 2010

Desalination and Water Treatment

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Nowadays, continuous, healthy water supply and total water quality management have emerged as an important issue in engineering applications. In a wide ranging assessment, the quality of the drinking water is being monitored in the distribution system, until it is supplied to the end user. It includes regular sampling and testing performed for assessing compliance with guideline values. The major purpose of this study was to monitor, evaluate and control the water quality in distribution system by using GIS to assess the drinking water quality in Denizli. The drinking water necessity in Denizli is supplied from various drinking water sources as Gokpinar, Derindere, Kozlupinar and Benlipinar springs and more than 30 deep wells. The storage reservoir volume fed by the water sources varies from 20 m 3 to 5500 m 3. Almost 56% of Denizli drinking water distribution system consists of asbestos cement and cast iron pipes. The non-revenue water in the water supply system is about 50%. In the old distribution systems, epidemic illness risk is at high rate and the free residual chlorine has to be kept at certain amount. Therefore, the free residual chlorine amount has to be measured during the summer months against the epidemic danger. The chlorine reacts with the organic matter and the amount decreases; it forms the carcinogenic trihalomethanes (THMs). In this study, three organic matter precursors; namely total organic carbon (TOC) concentration, UV absorbance at 254 nm and free residual chlorine concentration has been measured in 30 points at various parts of the Denizli city water distribution system and mapped by GIS.

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Water Quality Variations (WQVs) on Water Distribution Systems in KOREA According to Seasonal Varying Water Temperatures

Cited by 3 publications

References 0 publications

Field Studies and Modeling Exploring Mean and Maximum Water Age Association to Water Quality in a Drinking Water Distribution Network

Field Studies and Modeling Exploring Mean and Maximum Water Age Association to Water Quality in a Drinking Water Distribution Network

Modeling and Field Work to Investigate the Relationship between Age and Quality of Tap Water

The Geographical Information System (GIS) based water quality assessment of a drinking water distribution system in the Denizli City

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