Water Online

June 2012

Water Online the Magazine gives Water & Wastewater Engineers and end-users a venue to find project solutions and source valuable product information. We aim to educate the engineering and operations community on important issues and trends.

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Case Study systems at the water district are ferric chloride, sodium hydroxide, sulfuric acid, and sodium hypochlorite, and actual costs are approximately $500/week, or $26,000/ year. The district's treatment system does not require as much pH adjustment because its customized media is effective at oxidizing contaminants over a wider range of pH. This results in significant savings of the chemicals required by undifferentiated media types to bring feed water into a suitable range for effective oxidation. The Outcome: Net Present Value Calculation The new filtration system's lifecycle savings will continue through 2030 (20 years from installation) and will increase after the initial investment payback period. A net present value (NPV) calculation provides a way to evaluate these savings. In an NPV calculation, each cash outflow is discounted back to the present value (PV), and then summed (wikipedia.org). (See prior page for illustration of calculations). our clean water act. Presenting Matco-Norca's wastewater and water treatment products are made to industry specifications to meet all your requirements. Our extensive inventory makes us your most reliable source, and our longstanding global partnerships ensure consistent quality and availability. For all your cost efficient water treatment needs, we're a tough act to follow. Call Matco-Norca to learn how we can fit into your business. The NPV calculation reveals that the district will pay approximately $14.5 million in present day dollars for installation, including the 20-year O&M; costs for its new pressure media water filtration treatment system. This compares favorably to $16.3 million if they had purchased a treatment system with a long backwash cycle that used undifferentiated media, $27.6 million for a reverse osmosis treatment system, or the $68 million it would have cost to purchase the same amount of water from the MWD for 20 years. Conclusion Global sourcing. National compliance. Local service. • Toll Free: 800-935-5456 • Fax: 713-680-2999 CALIFORNIA • Toll Free: 866-532-8306 • Fax: 866-532-8307 TEXAS NEW YORK • Toll Free: 800-431-2082 • Fax: 845-278-9056 WEB: www.matco-norca.com • EMAIL: mail@matco-norca.com 26 Water Online The Magazine, Cleanwater Edition ■ wateronline.com The present value cost of this desert community's water treatment system is less than $.55 per 1,000 gallons for the next 20 years, and its water is now clean and safe. Before filtration, the raw water's arsenic influent contamination level was 19 ug/l; after treatment, it is non- detectable at or below 4 ug/l. The water district's experience has demonstrated that lower initial filter costs often do not represent best long-term value because lifecycle operating savings can outweigh initial capital cost savings when compared in today's dollars. The district's new

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