pH Control
We can also inject CO2 to lower pH.
- Carbon dioxide is a gas which produces carbonic acid, a weak acid, when dissolved in water.
- Carbonic acid is a mild acid present in water as H+ and HCO3, which are highly reactive ions.
- The ions react immediately with alkalis such as caustic soda, sodium carbonate, and dissolved lime, turning them into neutral carbonates and bicarbonate salts.
CO2 + H2O » H2CO3
H2CO3 + 2NaOH » Na2CO3 + 2H2O
H2CO3 + Na2CO3 » 2NaHCO3
One disadvantage to using CO2 gas is it drastically raises your bicarbonates…however, ozone will drastically reduce your bicarbonates, so ozone and CO2 are a perfect one-two punch for water enhancement.
Benefits of using CO2 gas to lower pH:
- Safe to use
- Accuracy of regulation
- Low maintenance system
- Flexibility
- Safe for the environment