Brinemag 3

Transform Adelaide desal plant waste water to commercial minerals using CO2 from gas power generation.

How this will impact Adelaide's carbon emissions

Adelaide desalination plant processes 270 megalitres /day and discharges concentrated brine to ocean containing valuable minerals. The discharge water is approximately 135 ML /day. Cubic has a patented process to recover the most valuable waste minerals for commercial product conversion using Cubic proprietary technology.

The principal minerals targeted are magnesium, calcium, potassium and sodium. Using CO2 from sources such as industry or gas power electricity generation, the CO2 is fed in solution to the waste stream of the desal plant where the minerals are first separated by chemical process steps and then the CO2 is fed to each separated mineral to form a pure carbonated mineral of each mineral of Mg, Ca, Na and K.

The process route will transform approximately 2.4 million tonnes of CO2 a year and make the desalination plant CO2 carbon neutral.

The mineral of magnesium is used to make a high grade magnesium powder or in an additional process put to a furnace where magnesium and calcium are heated with aluminium waste to for a vapour that is condensed to liquid metal suitable for direct magnesium hot metal casting.

The magnesium powder can be used for metal matrix composite powder technology which can be blended with alloy powders for high tech 3D application or transformed to corrosion inhibitor paints for providing a composite suitable for corrosion protection on aircraft and ships, bridges etc. Recycled desalination plant waste water that has been demineralised can be then treated for irrigation or drinking water to an amount of approximately 100 mega litres day at a value of $1.00 per kilolitre.

The sale of by products from the process can be
approximated to a revenue value of $321 million per annum and a net profit of $ 147 million per annum.

The annual power supply agreement with AGL for 20 years is reported as being $1 million / day or approximately $ 347 million year. If a carbon price was ever introduced at say$23 tonne the annual return would increase by $55 million year and bring total revenue to $376 million year. Making the cost of energy zero for desalination.

An annual CO2 reduction from the gas fired generation of electricity is calculated at 2.4 million tonnes of CO2 year and would be a significant and valuable reuse of water and conversion of CO2 emissions while lowering the overall cost of desalination from the sale of nano materials.

Voting has now closed for the Wildcard prize. Stay tuned to find out which project will be the 11th finalist.


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