Water Online

September 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 Vijay Sundaram A finite freshwater supply and an ever-increasing demand for water are making sustainable water resource management necessary for many cities. Inland and coastal communities alike are becoming more water- conscious and are planning or have already implemented water- conservation measures to reduce their water demand/water footprint. For most communities, the next step in sustainable water resource management is diversification of their water supply portfolio. Considering the available new water supply options, highly treated municipal wastewater is the most reliable, yet underutilized source of freshwater in many urban areas. Reuse of refreshed municipal effluent is not new. Well-known reuse projects have been in practice since the 1980s. However, the methods for providing advanced treatment to wastewater and the realistic options for reuse water have changed significantly. The new water planning paradigm considers all water in the hydrosphere as "one water," and the potential for use and reuse is summarized schematically in Figure 1. When considering wastewater as a reliable source for augmenting a community's water supply, there are two basic options: Dual Pipe (Conventional): Dual plumb the community (i.e., install "purple pipe") to keep recycled water 16 If you thought reverse osmosis was the one and only choice for potable water reuse, think again. Ozonation followed by biological activated carbon (ozone-BAC) is more suited to inland communities and may be better at removing chemicals of emerging concern (CECs). Need More Water? Think Ozone-BAC For 'One Water' Resolution Figure 1. Illustration of One Water approach wateronline.com n Water Innovations

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