What is a Quantitative Microbial Risk Assessment (QMRA) in drinking water?

A Quantitative Microbial Risk Assessment (QMRA) is a systematic process used to evaluate the microbial safety of drinking water. It assesses the potential for infection from specific pathogens, like adenovirus, to ensure compliance with health-based targets, such as less than one infection per 10,000 persons per year. This rigorous assessment helps water suppliers, like those AMPAC USA serves, optimize treatment strategies and maintain public health.

Is UV disinfection alone effective against adenovirus in drinking water?

The study indicates that UV disinfection alone, at doses of 40 mJ/cm² or 73 mJ/cm², was insufficient to reduce adenovirus levels to meet health-based targets without additional treatment. While UV is a critical component in multi-barrier approaches, AMPAC USA emphasizes that it often requires combination with other disinfection methods, like chlorine dioxide, for comprehensive viral inactivation.

What concentration of chlorine dioxide is effective for adenovirus removal in drinking water?

Chlorine dioxide was found to be a highly effective treatment step for adenovirus, even at low initial concentrations of 0.05-0.1 mg/l. This study demonstrated that chlorine dioxide at these levels could sufficiently treat water to meet health-based targets on its own. AMPAC USA designs systems that leverage such efficient chemical disinfection for robust water purification across various applications.

What are the health-based targets for microbial safety in drinking water?

The health-based target for safe drinking water, as referenced in the Dutch Drinking Water Act, is set at less than one infection per 10,000 persons per year. This stringent standard guides water treatment plants in conducting QMRAs to ensure the continuous microbial safety of their water supply. AMPAC USA's systems are engineered to help clients consistently achieve and surpass such critical safety benchmarks globally.

What indicators are used to assess disinfection efficiency for adenovirus in drinking water?

For UV irradiation, somatic coliphages were identified as a good, conservative indicator for adenovirus disinfection efficiency. Similarly, bacteriophage MS2 proved to be a reliable, conservative indicator for assessing chlorine dioxide disinfection. These indicators help water treatment specialists, including AMPAC USA's engineers, evaluate and validate the performance of their purification systems in real-world scenarios.

QMRA Of Adenovirus In Drinking Water At A Drinking Water

How UV and Chlorine Dioxide Disinfection Fight Adenovirus in Drinking Water

By:Schijven, J (Schijven, Jack)^[ 1,2 ]; Teunis, P (Teunis, Peter)^[ 3 ]; Suylen, T (Suylen, Trudy)^[ 4 ]; Ketelaars, H (Ketelaars, Henk)^[ 4 ]; Hornstra, L (Hornstra, Luc)^[ 5 ]; Rutjes, S (Rutjes, Saskia)^[ 1 ]

\n\n

disinfection-by-products-in-small-drinking-water-systems/”>drinking-water-have-any-unpleasant-chlorine-smell/”>WATER RESEARCH

\n\n

Volume: 158

Pages: 34-45

\n\n

DOI: 10.1016/j.watres.2019.03.090

Published: JUL 1 2019

Document Type:Article

\n\n

Abstract

The Dutch Drinking Water Act of 2011 requires water suppliers to run a Quantitative Microbial Risk Assessment (QMRA) every four years. This helps them check how safe their drinking water is from pathogens like enterovirus, Campylobacter, Cryptosporidium, and Giardia. The goal is simple: less than one infection per 10,000 people each year. But at Evides Water Company, they had a question: is their current water treatment, which mainly uses UV and chlorine dioxide, really enough to cut down adenovirus (AdV) levels? This study set out to answer that.

We estimated AdV concentrations in the source water in a few ways. We counted total AdV using integrated cell culture PCR (iccPCR), most probable number PCR (mpnPCR), and quantitative PCR (qPCR). We also counted AdV40/41 with mpnPCR and qPCR. Why AdV40/41? It makes up a big chunk of total AdV, and only a tiny fraction of AdV is actually infectious-about 1 in 1700. We looked at past studies and real-world plant data. Somatic coliphages turned out to be a good, reliable indicator for how well UV light disinfects AdV. Likewise, bacteriophage MS2 was a strong indicator for chlorine dioxide disinfection.

We then used literature data to fit the extended HOM model, seeing how effective chlorine dioxide disinfection was. What did we find? Chlorine dioxide treatment, even at low initial concentrations (0.05-0.1 mg/l), was the key player. It did enough on its own to meet the health-based safety goal. UV disinfection for AdV, whether at 40 mJ/cm(2) or 73 mJ/cm(2), just wasn’t enough without that chlorine dioxide step. (C) 2019 Published by Elsevier Ltd.

\nhttp://cel.webofknowledge.com/InboundService.do?customersID=Alerting&smartRedirect=yes&mode=FullRecord&IsProductCode=Yes&product=CEL&Init=Yes&Func=Frame&action=retrieve&SrcApp=Alerting&SrcAuth=Alerting&SID=6Ed1zhO5XkMLhkwjb4M&UT=WOS%3A000470047700004\n\n

\nThe post QMRA of adenovirus in drinking water at a drinking water treatment plant using UV and chlorine dioxide disinfection appeared first on Facts About Water.\n\nSource: Water Feed