Seawater Desalination

August 31, 2023

Seawater Desalination

The SWRO process removes all existing salts and impurities from ocean water. Analysis have been done on seawater and the results state that the water contains approximately 3.5% dissolved solids and more than sixty of the chemical elements have been identified. The primary elements are sodium chloride (80% of the dissolved elements), Potassium (0.13% of the dissolved elements), Magnesium, sand / gravel, limestone, Manganese, Phosphorites, and other elements.

Since the oceans of the world contain 3.5% salt content; humans are unable to ingest this type of water to survive. There are many areas in the world where people are affected by either limited or no groundwater at their disposal. Depending on your geographic location – The Persian Gulf for instance has 45 grams of salt per liter, therefore, thermal desalination must be done while everywhere else there is a way to obtain pure and safe drinking water by the process of desalination through RO. Either process you use – thermal or reverse osmosis – the salt is cut down to 0.5 gram per liter and absolutely drinkable.

Treating seawater via reverse osmosis can be tricky because of how highly corrosive seawater can be on the membranes, and other components. Seawater also has a range of contaminants from microorganisms, heavy metals, and insoluble salts that can cause scaling or fouling of the RO membranes.

Pre-treatment for SWRO can consist of:

  • Pre-chlorination
  • Multimedia Filters
  • Dechlorination
  • Antiscalant injections

Sea Water Desalination process:

Desalination is the process of removing dissolved minerals from seawater, treated wastewater, and brackish groundwater by using a system called Reverse Osmosis (RO). The RO process removes approximately 95% to 99% of the salts and inorganic material found in the seawater which results in safe, healthy, and salt free drinking water.

Post-treatment for SWRO can consist of:

  • pH adjustment
  • Calcite filter

Since seawater is so highly corrosive parts made of special components are needed to make sure the system is performing at optimal levels and without issues. We at Kontel Global use only high-standard branded parts for our seawater desalination systems.

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