freeport, grand bahama island

Containerized Seawater RO for Industrial Process in Freeport, Grand Bahama Island


The Challenge

A global manufacturer located in Freeport, Grand Bahama was facing a shortage of water required for their manufacturing process and other facility needs. The facility draws water from a single land-based seawater well on the property and is treated by media filters and a two-pass RO system. The local government also provides water but quantity, quality and availability is variable and unreliable forcing the manufacturer to be self-sufficient to avoid disrupting their operations. The existing 1st pass seawater trains were severely deteriorated from the demanding environment and corrosive materials of construction. A short delivery option was needed to immediately supplement their existing seawater trains to increase capacity and reliability.


The Solution

Harn R/O was contacted through the manufacturer’s water services provider. Harn R/O had a mobile containerized seawater RO system available for lease that was designed and built by Harn R/O that would meet the manufacturer’s needs. The container was ready for shipment to Grand Bahama within 4 weeks and was started up within 8 weeks of agreement of lease terms.


Containerized Seawater Desalination Reverse Osmosis Pilot System
Containerized Seawater RO System Installed in Bahamas

Containerized seawater RO system designed and built by Harn R/O prior to 
shipment to Grand Bahama 

         Container installed at location in Grand Bahama during startup.


Containerize Seawater Reverse Osmosis Pilot SCADA system

The Result

The containerized seawater RO system designed and built by Harn R/O has been running continuously since September 2014 with a high degree of reliability and efficiency because of the sound design and high-quality materials and components. The unit is expected to operate indefinitely until the existing equipment can be replaced or refurbished.


  Screenshot of containerized seawater RO operator interface during startup.

Brief R/O System Specification

Owner:  Harn R/O
Application:  Treating seawater to support industrial manufacturing process
Startup:  September 2014 
Capacity:  86,400 gallons per day of permeate water at 45% recovery
Array:  Single stage, 3 pressure vessels containing 7 elements per vessel
Pretreatment:  Scale inhibitor, cartridge filter
Low Pressure Piping:  Sch. 80 PVC
High Pressure Piping:  AL6XN Stainless Steel
Membrane Type:  Filmtec SW30HRLE-400i
Frame Material:  Fiberglass reinforced polymer (pultruded)

                      Operating Data
Feed Conductivity:  50,000 μS/cm
Feed Temperature:  78.8 °C
Feed Pressure:  805 psig
SDI:  5.4
Permeate Flow: 60 gpm (45% recovery)
Permeate Conductivity:  450 μS/cm (99.1% rejection)
Energy Consumption:  6.92 kWh/kgal
System Features: 
  • 53’ High cube container
  • low-pressure feed/permeate flush boost pump (VFD)
  • (2) media filter vessels
  • cartridge filter, scale inhibitor system
  • isobaric energy recovery device (ERI PX)
  • (2) axial piston feed pumps (Danfoss, VFD)
  • CIP/permeate flush system
  • PLC-based control
  • Wonderware Intouch operator interface (PC)

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