Desalination Technology

The solar powered Passive Cellular Desalination Array is not only a highly efficient and fully scalable design, it also functions as a solar distillation device. There are other technologies against which the Passive Cellular Desalination Array can be compared.


Conventional methods used for desalination include distillation, electro-dialysis, freezing, ion exchange, and reverse osmosis.

Flash Desalination

In distillation saltwater is heated in one container to make the water evaporate, leaving the salt behind. The desalinated vapor is then condensed to form water in a separate container. Vacuum is applied to reduce the boiling point of the water, or a spray or thin film of water is exposed to high heat, causing flash evaporation then yielding fresh distilled water. Flash distillation is used in most desalination plants.


When salt dissolves in water, it splits up into charged particles called ions. Placed in a container with a negative electrode at one end and a positive electrode at the other, the ions are filtered by the membranes as they are attracted toward the electrodes; they become trapped between semi-permeable membranes, leaving outside the membranes a supply of desalinated water.

Reverse Osmosis

Pressure is applied to saltwater to force it through a special membrane. Only pure water passes, leaving concentrated seawater behind.

Solar Desalination

The Passive Cellular Desalination Array

This distillation process reclaims and reuses the vast majority of the energy collected from the sun, resulting in exceptionally higher output of fresh water over any given area. This revolution in efficiency combined with the flexibility of deployment and a very low user cost per liter make the Passive Cellular Desalination Array an extremely exciting opportunity.

The proprietary invention can be described as a cell or bubble with saltwater intake and fresh water output. By allowing the sun to warm a heating chamber within the cell, the saltwater is evaporated (leaving the salt and other impurities in solution) and the water vapor condenses on the cell’s chilling surface as desalinated water. The desalinated and largely purified water then drains from the cell and made available for drinking, cooking, cleaning and irrigation.

The Passive Cellular Desalination Array makes use of existing materials and production technology; whether implemented as a ridged array or as a flexible “bubble wrap” array, readily available production capacity and existing materials require little or no additional engineering. A significant proportion of required materials can be derived from recycled plastic.

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