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Granot Brackish Water Desalination Plant

EMS Mekorot Projects is conducting expansion work at the Granot desalination plant, located in southern Israel.  Starting this coming summer, the plant will produce 20,000 cu. m. per day of desalinated water. As opposed to seawater desalination, this particular facility desalinates brackish water pumped from boreholes in the area, and thus prevents the spread of brackish water throughout the coastal aquifer. Future expansion to a desalination capacity of 50,000 cu. m. per day is planned.

 

The Water Authority reach a decision to increase the discharge capacity of the facility from 9,000 cu. m. per day to 20,000 M^3/day, in the wake of Israel’s ongoing and incessant water crisis.

 

Despite the complexity of the project and the short time schedule for execution, the expansion project is currently in its final stages, and operational tests will commence shortly.

 

 

 

The Granot Desalination Facility: More Water, Less Pollution

 

The Granot Desalination Facility, which was established in 2004, in the vicinity of Kiryat Malachi, is different type of desalination system. As opposed to seawater desalination, the Granot facility desalinates brackish groundwater, which is not suitable for human consumption, due to its high saline content.

 

The Granot facility, which treats water streaming in from brackish boreholes in the area, not only increases the number of potable water sources; the desalination process at the plant gradually purifies the brackish aquifer layer that impacts the quality of the groundwater, thus preventing the spread of brackish water to other boreholes.

 

EMS Mekorot Projects was charged with the complex task of implementing the expansion to be carried out in conjunction with the continued operation of the existing Granot Facility and in part also within the boundaries of the facility. The significance of the incorporation of a new plant within the boundaries of an active facility is a complex task, because the facility contains a host of underground infrastructure. Furthermore, the existing facility cannot be shut down, as it must continue supplying desalinated water.

 

A Three Stage Expansion

 

Concurrent to the immediate expansion of the project, the Water Authority set an additional task: The long term expansion of the desalination plant to a discharge rate of 50,000 cu. m. per day.

 

The expansion will take place in three stages: The immediate stage, under the full responsibility of EMS Mekorot Projects, is the expansion of the capacity from 9,000 cu. m. per day to 20,000 cu. m. per day. Stage 2 includes expanding the capacity to 40,000 cu. m. per day, while Stage 3 expands the discharge capacity to 50,000 cu. m. per day

 

Stage 1 of the Granot Project includes:

 

  • Establishment of a raw water system consisting of drainage boreholes 12, 15 and 16 and laying 10 kilometers of 20", 28" and 30" diameter pipelines leading to the Granot facility;

 

  • Setting up a system to stabilize the raw water by adding hydrochloric acid;

 

  • Preliminary treatment, by means of security filters and micron filters.

 

  • Constructing a desalination unit containing seventy 8"-dual-stage pressure tanks, including the purchase of high pressure pumps.

 

  • The facility treats 521 cu. m. of raw water per hour, with a recovery rate of 80% - 88%.

 

  • Production of 417 cu. m. per hour of desalinated water with a chloride concentration of 20 mg. per liter.

 

  • A ventilation system for a direct osmosis tank.

 

  • A supplementary dilution system from branch boreholes is used to to harden the output water

 

  • A sampling system for diluted output water (to test water quality)

 

  • A concentrate treatment and removal system

 

 

Special works and Unique Equipment

 

The facility contains a variety of equipment produced from special structural materials, including super duplex high pressure pumps, SMO high-pressure pipes and a chemical dispensing system that features dispensing pumps and tanks made of composite materials.

 

EMS Mekorot Projects builds and establishes desalination plants, starting with the stage of manufacturing the electrical systems and the pipes as well as the installation of the electrical and command systems that serve all the systems. EMS also conducts civil engineering projects that include infrastructure and drainage, constructing structures and electrical rooms, sampling buildings, control rooms and service buildings.

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