Puerto Rico Electric Power Authority (PREPA) is the owner of South Coast Steam Power Plant located at Guayanilla in the island of Puerto Rico, about 150 KM south of San Juan. This power station is one of PREPA’s oldest units and uses an oil fired boiler as part of its generation process.
The plant decided to replace an old, antiquated ion exchange-based demineralization plant with a membrane-based demineralization system. This would avoid chemical regeneration and waste as well allow the plant to be more environmentally friendly. The membrane process also would allow easier environmental permitting for the client.
The feed water to the system is brackish well water and the treatment consists of double pass reverse osmosis system with final polishing by electrodeionization. The polished demineralized water is used for high pressure boiler feed water.
QUA’s Fractional Electrodeionization FEDI-2 HF stacks were chosen for the electrodeionization polishing step of the process due to their capability to handle variable feed conditions with a patented two-stage design. Additionally, the FEDI stacks provided a high quality, compact solution due to their high flow capacities.
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