Central versus Point-of-Entry/Point-of-Use Treatment: The case of three small BC communities

Description:Central versus point-of-entry/point-of-use treatment: The case of three small BC communities. Presenter: Cheryl Gomes, M. Eng., BI Pure Water. Additional Contributors: Madjid Mohseni, P. Eng., Ph.D., RES'EAU WaterNET. Household water treatment devices installed in individual homes are often recommended for very small communities. At a certain population, however, a centralized treatment facility may become a better investment. To date, there has been no detailed analysis of the parameters and factors affecting the choice between central, point-of-entry (POE) and point-of-use (POU) treatment. This project examined this for 3 small BC communities of different sizes and source waters, with the focus on (a) minimizing overall cost, (b) meeting Canadian Drinking Water Quality Guidelines (CDWQG), (c) minimizing maintenance and operator expertise level, and (d) eliminating health risks to end users. The three communities were Nickeyeah IR25 (Lytton First Nation, 6 homes), Middle River (Tl’azt’en Nation, 11 homes), Shawnigan Lake (Cowichan Valley Region District, 2000 residents). Treatment technologies and processes considered for each community were based on the source water type (e.g., lake, creek, river) quality and variation. An Excel template was developed to analyze user-selected combinations of central, POE or POU treatment technologies; calculating capital, O&M and total cost as a function of flow rate, over a 20-year analysis period for a small system. In this presentation, we will present the results detailing the feasibility of applying POE/POU in very small communities. Also, we demonstrate through a sensitivity analysis that (a) reducing capital cost of expensive POE devices has no effect on the choice of treatment option, and (b) considerations of long term growth of community size may affect the choice of treatment (i.e., POE vs. central treatment).

Authors: Cheryl Gomes

Subjects:

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

Citation:Stream 1: Small Water Systems

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

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