Ashdod Desalination Plant, Ashdod, Israel
Ashdod desalination plant is being constructed in the coastal city of Ashdod in Israel. Mekorot Development & Enterprise, a subsidiary of Israeli water firm Mekorot, signed an agreement with the Israeli Government for the construction of the desalination facility in August 2011. The plant will supply 100 million cubic metres of desalinated seawater annually to the national water system through the National Water Carrier.
The Ashdod facility will contribute around 15% of Israel's domestic water consumption. Upon completion, it will be among the world's biggest seawater reverse osmosis (SWRO) plants with ultra-filtration (UF) as a pre-treatment process.
Ashdod facility details
The Ashdod facility is the fifth plant being built in Israel after the Ashkelon (120m³/day), Palmachim (45m³/day), Hadera (127m³/day) and Sorek (624,000m³/day) facilities. It will draw water from the Mediterranean coast, similar to the other four plants.
Mekorot Development & Enterprise awarded a turnkey contract to IVM in November 2009. The consortium partners include Israeli infrastructure company Minrav Holdings and Spanish construction company SADYT. Mekorot will plan, build and operate (BOT) the project for a period of 26.5 years before transferring ownership to the state.
Construction of the desalination plant began in August 2011 with €120m ($163m approximately) provided by the European Investment Bank. Hapoalim Bank will also provide financing for the project.
Desalination plant components
The Ashdod desalination plant will cover an area of 7,450m² and have a total built-up area of 6,300m². The SWRO facility includes two main buildings, each comprising pre-treatment and RO process equipment.
Other plant infrastructure, such as brine pumps, tanks, raw water tank and pre-filtering equipment, will be located outside the buildings.
Water treatment process
The plant will use RO process to remove dissolved salts and impurities from ocean water with UF as a pre-treatment process.
Two pumps will pump the seawater from the Eshcol Power Station. The feed water will then pass through filters to remove coarse and fine impurities. Desalinated water from the plant will be stored in a 3,000m³ storage tank and then sent to a UF pre-treatment station.
The UF unit removes marine organisms and other contaminants from the water. The pre-treatment technology will prevent clogging of the RO membranes. The desalination process will be supported by Pentair X-Flow, which will supply its Seaguard UF membranes and skids to the Ashdod plant.
PX pressure exchanger energy recovery devices will be incorporated to bring down the energy consumption of the RO process.
Richard Miller Treatment Plant (RMTP) is located in the city of Cincinnati, Ohio, US.
UF treated seawater will be discharged to the two backwash tanks and then passed through the RO units through to the two treated water tanks. The treated water will then flow to the parallel and similar SWRO units consisting of a booster pump, a high-pressure aggregate and a membranes stack.
The SWRO permeate and flushing tank will collect permeate from the RO trains with a UF permeate capacity of 930 million litres/day.
A 2,000m³ tank will hold the final in-flow of treated water. Four pumps, three operational and one stand-by, will pump the water at a pressure of ten bar to the main water supply line.
The disposed back-wash water from the UF units mixed with brine from the desalination facility will be discharged to an underground tank through an existing canal.
Treated water will then be mixed with fresh potable water from the national water carrier system to improve the quality of water delivered to consumers.
Key players involved
In July 2012, a $1.67m contract was signed between Amiad Water Systems and IVM to provide an Arkal Super Galaxy automatic disc filtration system (SpinKlin R) to protect the UF membranes at the Ashdod plant. Another $95m contract was signed by The Baran Group to build the desalination facility.
Energy Recovery (ERI) was appointed to supply PX pressure exchanger energy recovery devices for the desalination plant.
BEL Composite Industries has been contracted to supply the pressure vessels. The contractual scope includes the supply of 5,250 pressure vessels (membrane housings) with a working pressure of 1,200psi (82 bar) with eight membranes each for the first stage and working pressure of 450psi (31 bar) with seven membranes each for the second stage.
General electric works for the desalination plant are to be completed by General Engineers, who will also supply Bently Nevada condition monitoring equipment based on vibration signals output to monitor the high/low pressure pumps from motors and pumps at the plant.
Other partners involved in the engineering and construction of the Ashdod plant include Groisman Engineering, Valoriza Water and SK Engineering & Projects.
Fire extinguishing systems for the desalination plant were designed and installed by Paz Systems. The company supplied fire extinguishing pumps and water-based fire extinguishing systems, such as sprinklers, indoor fire protection cabinets and fire extinguishing hydrants with shut-off valves.