Water. Desalination + reuse
Issue link: https://fhpublishing.uberflip.com/i/1019735
24 In Site September 2018 water.desalination+reuse WORLDWIDE DEMOS, PILOTS AND PRODUCT LAUNCHES The latest on treatment options in wastewater reuse, and a rapidly commercialising reverse osmosis process PROJECTS Potable reuse in Colorado De Nora's ozone in Hong Kong Rotec refi ts Kranji RO, Singapore TRENDS Inland water reuse Ozone and biologically active fi lters Higher-recovery RO IN SITE "To create innovative solutions… that's really exciting." MARWAN NESICOLACI, DE NORA WATER TECHNOLOGIES Page 26 The state of Colorado, US, had not, until the PureWater Colorado demonstration project started up in January 2018, hosted a potable reuse project. The demo, part- funded by utility Denver Water, which serves 1.4 million people, was brought forward by Carollo Engineers and collaborators Calgon, Pall, and Xylem, to demonstrate the eff ectiveness of their technologies and water treatment expertise, and to promote the conversation about water reuse in the state. Colorado is a land-locked Southwestern state that projects a doubling of its population of fi ve- and-a-half million by 2050. "The project was intended to bring utility leaders, regulators, and politicians to the site so that they could see the technology, actually drink the water and understand the capabili- ties of reuse technology," explains Steve Green, business development manager at Xylem. The demo took secondary wastewater to an ozone contactor, then a biologically active carbon fi lter (BAF), followed by a microfi l- tration (MF) membrane, granular activated carbon (GAC), and fi nally an ultraviolet (UV) advanced oxida- tion process (AOP), which was a UV peroxide. The host plant has a tertiary treatment system, but the team pulled water a er the second stage in order to demonstrate that the technologies work for second- ary wastewater. "Within the reuse world, this is a de facto approach to an inland reuse project. For projects nearer to the ocean the preferred approach is typically reverse osmosis (RO)- based — ozone, BAF, MF, RO, AOP — because you can dispose of the brine concentrate into the ocean. It's the same as desalination except that in reuse the target is not salin- ity, but the contaminants that exist in wastewater. Brine is expensive to dispose of inland; you typically have to pump it deep into the ground, or PureWater Colorado: "To create innovative solutions… that's really exciting." MARWAN NESICOLACI, DE NORA WATER TECHNOLOGIES Page 26 PureWater Colorado: