Ranking the toxicity of drinking water contaminants as a prelude to the choice of point-of-use and point-of-entry treatment devices

Description:Ranking the toxicity of drinking water contaminants as a prelude to the choice of point-of-use and point-of-entry treatment devices. Presenter: Mohammed Dore, Ph.D. Brock University and Res'eau-Waternet. Additional Contributors: Prof. Andrew Laursen, Department of Biology & Chemistry, Ryerson University, Toronto, Ontario. Point-of-Use (POU) and Point-of-Entry (POE) treatment devices with NSF classification numbers 42,53,55, 58 and 401 are now available that could enhance the multiple barrier approach to drinking water treatment. NSF # 401 is capable of removing most micro-pollutants such as pharmaceuticals and endocrine disrupters. The objective of this research is to provide households with and without centralized water treatment, information on the choice of such devices. While the choice for specific locations would depend on their source of raw water, some generalized information on the ranking of toxicity of contaminants would be beneficial. Accordingly we develop a metric of the toxicity of priority contaminants following the method used by the US Center for Disease Control’s Agency for Toxic Substances and Disease Registry. Their prioritization is risk-based, with risk calculated as a function of geometric mean concentrations in media of exposure (air, water, and soil), and relative toxicity, incorporated into the calculation as a categorical factor score. Here, we present a revised priority list based upon drinking water as the sole route of exposure, following the procedure of CDC but excluding soil and air as routes of exposure. We use this to determine the 10 highest-priority chemical contaminants in each of several categories (inorganics, volatile organic contaminants, and synthetic organic contaminants). We then test various Point-of-use (POU) devices in the marketplace to determine their efficiency for removal of these highest priority contaminants. We present an assessment of relative cost versus efficiency for common POU devices.

Authors: Mohammed Dore

Subjects: Drinking Water

Tags:2015 BCWWA Annual Conference & Trade Show,AC15,AC15 presentations

Citation:Stream 7: Technology and Innovation

Publication Date:May 28th, 2015 Upload Date:Jun 25th, 2015

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