Water Online

June 2013

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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Technology systems. PX technology provides the opportunity to develop unbalanced flow schemes to improve the performance of RO desalination by increasing the overall recovery of desalination RO systems and transferring energy to the feed flow. Any RO treatment alternative is a high-energy solution compared to "fresh" surface water or groundwater treatment systems. However, "low pressure" brackish water RO technology (BWRO) has been successful in brackish The key to expanding the use of RO desalination has come down to finding ways to reduce the energy required to overcome the osmotic forces applied to the membrane. water applications where total dissolved solids (TDS) are less than 3,000 ppm. In contrast, seawater typically has a TDS content of approximately 32,000 ppm. The higher dissolved solids content of seawater requires much higher pumping pressure to overcome the osmotic forces. Seawater RO (SWRO) typically operates at a pressure of approximately 750-1,000 psi. BWRO systems typically operate at pressures less than 200 psi; this lower pressure translates to a much lower power cost. In addition to the power savings, BWRO has less waste product produced per gallon of water treated. BWRO typically rejects about 20-30% of the raw water produced in a waste concentrate stream, while SWRO typically rejects up to 40% of the raw water in the waste concentrate stream and pretreatment operations. The capital cost of desalination is project specific. Many elements of the project can influence the capital Presenting our clean water act. Matco-Norca's wastewater and water treatment products are made to industry specifcations 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 efcient water treatment needs, we're a tough act to follow. Call Matco-Norca to learn how we can ft into your business. Global sourcing. National compliance. Local service. CALIFORNIA TEXAS NEW YORK • Toll Free: 866-532-8306 • Toll Free: 800-935-5456 • Toll Free: 800-431-2082 • Fax: 866-532-8307 • Fax: 713-680-2999 • Fax: 845-278-9056 WEB: www.matco-norca.com • EMAIL: mail@matco-norca.com wateronline.com ■ Water Online The Magazine 13

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