Cayman Islands Consolidated Water

Consolidated Water (Bahamas) Limited

BLUE HILLS

Plant type:
Seawater Reverse Osmosis
(SWRO)

Location:
Nassau, New Providence, The Commonwealth of the Bahamas

Capacity:
12 million US gallons per day (45,425 m3 per day)

Contract type:
Design, Build, Own, Operate

Customer:
Municipal/Government

Commissioning date:
July 2006

 

This facility is located in the Bahamas on the island of New Providence, in the Bahamian capital of Nassau.

This facility is currently the largest seawater reverse osmosis plant designed, built and operated by Consolidated Water, and it is also the largest seawater reverse osmosis desalination facility operating in the Bahamas.

Completed in 2006 on a fast tracked building schedule, one half of the plant’s production capacity of 7.2 million US gallons per day was online a short 53 weeks after contract award, and full production capacity was online a mere 65 weeks after contract award. In January 2012, a 4.8 million US gallon per day expansion was completed.

All the water produced by the facility is sold to the Water and Sewerage Corporation of the Bahamas for the public water supply under a 20-year Design, Build, Own and Operate agreement. In addition to installing new water production capacity, Consolidated Water has provided world-class technical expertise and equipment to reduce the customer’s distribution losses by 1.2 million US gallons per day.

Prior to the construction of this facility and the Windsor facility, all the water used in the public drinking water system came either from groundwater wells located on New Providence or groundwater barged to the island from Andros Island. As water demand in New Providence grew, these groundwater sources were over-taxed, degrading the overall quality of the water entering the public system.

The commissioning of this facility, and the work performed to reduce pipeline losses, has  gone a long way to relieve the pressure on the groundwater resources and improve the overall quality of the drinking water supplied to the people of New Providence.

The cost of electricity on Caribbean Islands is typically 4 to 5 times greater than in the United States, and the island of New Providence is no exception. A critical factor in the design and operation of this plant is energy efficiency. To that end the plant utilises both the advanced Calder DWEERTM (Dual Work Exchanger Energy Recovery) system to recover energy from the high pressure brine stream, and diesel engines to drive the main high pressure pumps.

The total amount of energy required to operate the facility, including all ancillary equipment, is guaranteed to our customer. The plant includes a stand-by diesel driven generator, which along with the diesel driven high pressure pumps, allows the plant to be fully functional even when the normal electrical service is down, as may occur during a hurricane.

The facility also includes a fully automated post-treatment stabilization and chlorination system for the final product water, as well as a 750,000 US gallon elevated storage reservoir.