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By Atlas High Purity Solutions team • December 5, 2017

2-Pass RO water system for Power Generation Facility

Atlas High Purity Solutions summarizes the design and installation of a 2-pass RO water system for a Northeast power generation facility


Challenge: A New England power plant was experiencing degrading city feed water quality to their existing single-pass reverse osmosis (RO) / electrodeionization (EDI) set-up. With the EDI requiring > 40uS conductivity, RO permeate was consistently failing to deliver minimum EDI feed requirements despite 97%+ rejection from the RO membranes. The resulting problems included an increased spend on emergency mobile water systems and increased demand on staff to coordinate emergency services.

Solution: Atlas and Pure Flow converted the existing RO into a 2-pass RO water system to enable the customer to run their EDI at a significantly higher feed conductivity to the first pass RO. Atlas and Pure Flow’s solution included a new Suez E8 (previously GE Water), RO and a break tank, chemical injection system, and Grundfos demand pump all added before the existing RO system.

The second-pass RO reduced feed conductivity to the EDI by 98%. The result is a more robust and reliable system that also produces higher quality EDI permeate. The power plant can now run with their EDI at various plant feed water conditions. 

For more information on EDI, check out our recent interview with Suez Water

Suez E8 Reverse Osmosis RO System


Atlas High Purity Solutions has been designing, installing, and servicing high purity water systems for more than thirty years, and is the leading provider of reverse osmosis and DI water solutions in the northeast United States.

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