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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Thinking has shifted from "Can we do this?" to "Here's how we'll do this." For example: • Florida A-FIRST project — Runoff for irrigation, Altamonte Springs, FL Located near Orlando, FL, Altamonte Springs took a holistic approach to both stormwater management and water supply for irrigation. To increase supply, relieve use of its aquifer, and manage runoff from highway I-4, the city developed the first stormwater capture from highway I-4 to be used for irrigation. The new Altamonte Springs-FDOT Integrated Reuse and Stormwater Treatment (A-FIRST) redirects up to 6 MGD of captured stormwater for irrigation — 1.5 MGD to the city and another 4.5 MGD to the neighboring city of Apopka — to reduce pumping from the aquifer and eliminate up to 3 MGD of peak flow to the Little Wekiva River. In addition, the project eliminates the need for more stormwater retention ponds, which in the past could allow pollutants to seep into groundwater. • Los Angeles Urban Stormwater – River as green infrastructure, City of Los Angeles, CA In a win-win for the city, the Los Angeles Stormwater program combines flood control and pollution reduction to monitor and reduce pollutants in stormwater runoff. The Los Angeles River Revitalization Master Plan looks forward to the day when, rather than channeling stormwater to the ocean from its many iconic viaducts, the LA River will start to return to a natural environment, supporting recreation and water quality as well as stormwater control. This effort builds on others aiming to rebalance the proportion of LA water that comes from imported supply, and to recycle larger volumes of water for local and regional use. 6. Planners are re-thinking irrigation as a reuse application. Even as reuse for irrigation continues to expand, the rise of potable reuse technology raises an important question: After all that cost and treatment, is irrigation the best application for recycled water? The thinking is that water is too precious and should be used for a higher purpose — drinking water. 7. Costs are making the purple pipes less practical. While the concept of reusing graywater remains very popular, the cost of implementation remains a barrier. The main trouble is that cities were not designed with purple pipes, or those marked for recycled water, and the retrofit can be cost-prohibitive. 8. Ongoing research and discovery: Understanding health and environmental impacts. Research will help answer questions like how to reduce viral pathogens and develop guidelines for treatment to prove feasibility of potable reuse as a regular practice. For example, between now and 2018, the Water Research Foundation (WRF) is conducting a new study to provide guidelines and requirements for water reuse to protect public health: "Conventional Drinking Water Treatment of Alternative Water Sources: Source Water Requirements." This research will develop quality parameters, objectives, and treatment protocols for the design, operations, and monitoring of incorporating alternative sources into drinking water supplies. 9. Regulations remain regional. Policies and regulations for reuse will continue to address local needs. On one hand, Arizona prohibits direct potable reuse by law. On the other, Florida is changing its law for recycled water to make it more viable. Local conditions reign. We may never see federal standards or regulations since these would have to address a national need and more universal conditions. n wateronline.com n Water Innovations 19 WATERREUSE Christopher Hill, PE, BCEE, ENV SP, is a vice president of Arcadis, the Water Supply & Treatment Lead for North America, and a board mem- ber of the Water Environment & Reuse Foundation. He has 24 years of experience as a drinking water expert, applying innovative vision and proven technical expertise to more than 100 projects for cities and communities around the world. Chris has a keen understanding of the water cycle, which includes wastewater treatment and resource recovery, and is recognized as a thought leader in alternative water supply solutions such as reuse and desalination. About The Author Research will help answer questions like how to reduce viral pathogens and develop guidelines for treatment to prove feasibility of potable reuse as a regular practice. Recycled water flow via purple pipes at the treatment plant

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