Work will start on site in September 2015 on a major upgrade and modernisation programme for Jersey’s La Rosière desalination plant, to improve security of supply during periods of low rainfall, increase capacity and reduce running costs.
Owned and operated by Jersey Water, La Rosière desalination plant is an essential standby facility used to top up the island’s Val de la Mare reservoir during prolonged dry periods.
The first desalination plant in the UK, Jersey Water last upgraded La Rosière in 1999. The modernisation works will bring the plant completely to date and at the same time, almost double the plant’s capacity to take account of changing climate conditions, population growth and summer demand from tourism.
ACWA Services Ltd, part of the ACWA Group, a leading international water and wastewater solutions provider, has been appointed to carry out the upgrade.
The turnkey solution comprising design and procurement through to installation and commissioning, will see the complete redesign and expansion of the existing seawater reverse osmosis (SWRO) process streams with new pressure vessels, an additional dual media filter, next generation high capacity RO membranes, pre-treatment systems and associated equipment. To keep the plant footprint small and to satisfy demanding island planning authority constraints, all new technology and equipment will be situated within the existing facility.
The new plant will take fresh water production when the plant is online, from the current capacity of 6 million litres per day, up to 10.8 million litres. ACWA’s design allows for potential future expansion to 15 million litres per day, ensuring additional longevity for the plant should demand grow further.
In addition ACWA is specifying a state of the art energy recovery system that recovers hydraulic energy from the reject stream of concentrated brine, the liquid left over after salt has been extracted from the treated water. This will reduce energy use at the plant by 36% – a significant improvement over the current existing plant.
Helier Smith, Chief Executive at Jersey Water said:
“ACWA’s track record and international experience with desalination and advanced water treatment technology, makes them a perfect partner for this critical water industry infrastructure project on Jersey. With the current plant at the end of its serviceable life, ACWA’s solution will increase capacity and resilience for the Island’s public water supply in times of low rainfall and built-in energy recovery will ensure that running costs are lower when the plant is online.”
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