NanoStack membrane coating has completed a multi-year pilot at the Orange County Water District (OCWD) Groundwater Replenishment System (GWRS), with OCWD now moving forward with a full-scale installation of the technology on reverse osmosis (RO) membranes.
WaterSurplus will supply 1,050 NanoStack™-coated RO membrane elements—equivalent to a full RO train—designed to treat approximately 5 million gallons of water per day for indirect potable reuse at the GWRS, widely recognised as the world’s largest advanced water purification facility for potable water reuse.
NanoStack membrane coating targets fouling and energy use
According to the company, pilot performance data showed improved fouling resistance, with clean-in-place (CIP) requirements reduced by more than half and RO energy consumption lowered by more than 15%. WaterSurplus said the resulting operating efficiencies could deliver a payback period of under two years, depending on site conditions and operating strategy.
NanoStack™ is a hydrophilic membrane surface modification applied to finished RO membrane elements. WaterSurplus says the coating is intended to improve durability and cleanability, supporting longer membrane life and reduced lifecycle costs for operators.
The company also notes that NanoStack™ is NSF/ANSI/CAN 61 certified for use in drinking water applications.
WaterSurplus is based in Loves Park, Illinois, and is a subsidiary of Hawkins, Inc.
Learn more about WaterSurplus and its NanoStack™ technology here: watersurplus.com.
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