Problem: A New England power plant was experiencing degrading city feed water quality to their existing single-pass RO (reverse osmosis)/EDI (electrodeionization) 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: Pure Flow converted the existing RO into a 2-pass RO to enable the customer to run their EDI at a significantly higher feed conductivity to the first pass RO. 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 all plant feed water conditions.
For more information on EDI, check out our recent interview with Suez Water.
For more information on Pure Flow high purity water systems, visit our engineered high purity water systems page.