- Desalination for Drinking Water
Burns & McDonnell developed the request for proposal (RFP) for the expansion of the water treatment system at Guantanamo Naval Station in Cuba. The project required evaluating the existing system performance and components, which included field investigation, review of previous sanitary surveys and power consumption reports, and interviews with plant operations staff.
The RFP solicited design-build proposals for two new reverse osmosis (RO) seawater desalination membrane trains to operate parallel to the existing water treatment facilities. Special design consideration was given to specifying equipment that is interchangeable with existing trains, providing process instrumentation to protect the equipment and preserve process warranties, and to maintaining treatment performance during routine interruptions.
Ultimately the process will treat screened seawater through granular media pressure and cartridge filters before RO filtration and degasification, adding a permeate rate of about 0.58 million gallons per day, which continues in further treatment to potable standards. This project is part of a larger scope of services that Burns & McDonnell is completing for Naval Facilities (NAVFAC) Southeast at Guantanamo Bay.
- Update of the overall and train-specific process flow diagrams documented in the previous sanitary survey.
- Specification of two new RO treatment systems with associated chemical storage and feed systems, pretreatment facilities, degasification system, clean-in-place, and energy recovery system comparable to existing treatment trains.
- Energy recovery designed to limit power consumption per train to 10 kWh per 1,000 gallons permeate produced, based on the specific seawater quality parameters documented at the plant and the required permeate standards.
- Chemical storage and feed systems designed to include ferric chloride, sodium metabisulfite, sulfuric acid, and anti-scalant, with safety and containment provisions for each. Chemicals and other consumables such as filter media were evaluated to match existing processes, to reduce the number of different expendables that NAVFAC has to maintain at the facilities.
- Treatment system components, drives, and control panels to be containerized, complete with lighting and ventilation, and installed six feet above grade to minimize flooding risk. Entire footprint of new facilities will be covered by a pre-engineered metal building canopy. Provisions were included in the programmable logic controller and in instrument transmitter selection, to be compatible and expandable for future SCADA integration.