The largest use of carbon dioxide (CO2) for potable water treatment is for remineralization. This application is used for hardening of either naturally soft waters or waters that have been softened during the treatment process, through nanofiltration or reverse osmosis. Water hardness levels are a requirement of standards for potable water.
Following desalination, water's mineral level becomes very low. It must therefore be remineralized in order to reincorporate the elements that make it drinkable and non-corrosive.
Adding lime or limestone along with an acid is an essential step in remineralization. And using CO2 is an almost mandatory standard in this process.
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