Water Online

January 2017

Water Innovations gives Water and 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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By Christopher P. Hill W ater scarcity, both long-term and short-term, is already affecting large parts of the world. Persistent drought and the need for better stormwater management are expected to intensify with climate change and urbanization. Fortunately, with scarcity comes a silver lining: more and better water reuse strategies are taking hold, generating more efficient uses of the water we have. With the relentless pressure to balance demands for, and supplies of, water for drinking, agriculture, industry, energy, and recreation, water authorities continue to turn to stormwater, graywater, and wastewater reuse to meet the needs of their customers. While the industry looks globally for answers, utilities can't ignore local needs and conditions. Thanks to their collective contributions and local adaptations, water reuse continually reinvents itself. Watch these trends for 2017. 1. Reuse is on the rise, especially in California and Florida. In fact, according to a new study forecasting water reuse in the U.S. (http://www.wwdmag.com/ water-recycling-reuse/california-surpass-florida-largest- market-water-reuse), while Florida may have the most installed capacity, California has enough projects in its pipeline to surpass Florida's numbers. The study projects that overall, municipal reuse in the U.S. will increase 58 percent by 2026. The supporting infrastructure for water reuse, from purple pipes to advanced treatment for direct potable systems, will ultimately boost water sustainability for many years. For example, the Arcadis Sustainable Cities Water Index report notes that while no U.S. cities make the top 10 in the water sustainability ranking of 50 cities worldwide, both Los Angeles and San Francisco rank higher than other U.S. and European cities in water reuse. This existing base puts these California cities in a better place to achieve sustainability goals into the future. 2. Potable reuse sets the pace. The big interest now and into the future will be for potable reuse. We've figured out how to use water for irrigation. Recycling water for drinking holds even more promise for water-starved communities. 3. Up next: Direct potable reuse. The industry's goal — making direct potable reuse (DPR) feasible, reliable, safe, and accepted — is a work in progress, but one that makes headway every day. According to the California Direct Potable Reuse Initiative's "Reporting on significant progress," the studies sponsored by WateReuse and WateReuse California, creating the foundation for economic considerations, treatment regulations, safety standards, and operational protocols will better enable DPR to be employed in California. 4. Proven in El Paso. To address peak summer needs, the El Paso Water Utility (EPWU) tested the feasibility of direct potable reuse, and is now on track to bring a full- scale system online. Arcadis conducted a pilot test to establish treatment criteria, and identified the treatment protocols that would meet or exceed all standards and regulations. Now the utility is developing a DPR system to recycle 10 MGD of treated secondary clarifier wastewater effluent to supplement the city's current drinking water supplies. The full-scale system will provide ongoing data that can optimize DPR design elsewhere. 5. Reuse of stormwater and graywater continues to expand and adapt. Not to be ignored, the popularity of graywater and stormwater reuse will fuel projects on multiple levels, often solving multiple problems at once. 18 wateronline.com n Water Innovations Stepping Up Water Reuse — From Irrigation To Direct-Potable Water reuse is trending up. Here are nine developments to watch in 2017. Pilot testing for EPWU's planned Advanced Water Purification Facility

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