CO2 in water treatment
CO2 in water treatment
(OP)
From a novice: How does CO2 injection affect water treatment? How is it used?
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RE: CO2 in water treatment
In excess lime softening, lime is added to the water to combine with the free CO2, bicarbonate alkalinity, and magnesium. Then the precipitated calcium carbonate and magnesium hydroxide is settled out. The water is then recarbonated with CO2 to precipitate out the excess calcium hydroxide.
It is also used to make pH adjustments following filtration.