Water treatment using CO2
asked 3 June 2016 asked by Marine (300 points)
Replacing mineral acids with CO2 for pH reduction offers many benefits. By no longer buying or storing chemicals that can do more harm than good, you are making your site safer while also reducing costs. This improved process can help you manage peak demand and capacity increases, increase plant flexibility, and lessen your impact on the environment. And when you’re supplied by one of the world's largest carbon dioxide suppliers, you can explore this alternative with confidence. If you are sending your wastewater to another facility for treatment, or if a high pH costs you money in extra fines or fees, our CO2 pre-treatment options can help you avoid those fees with a system that reduces your pH before the wastewater leaves your plant. CO2 is also a great choice for replacing harmful chemicals from your process.
Good evening, In the production of drinking water, we are looking to attain the calco-carbonic equilibrium (also known as the lime/carbonic acid equilibrium). We talk in terms of neutralization if the CO2 used to produce bicarbonates is that of the raw water and remineralization if it refers to added CO2. Remineralization by addition of carbon dioxide: To increase the hardness and alkalinity by 10 mg/L (of CaCO3) each would require 0.74 mg/L of hydrated lime and 0.88 mg/L of carbon dioxide. In a related question, we are looking for any operators using chlorine dioxide (ClO2)
Hello, Thank you very much for your reply. I have looked into it and found the necessary equilibrium info. Are there other techniques to adjust water hardness or is CO2 the standard for this type of process? Do you have an idea of the percentage of drinking water that requires this type of adjustment—50%? I am trying to get an idea of the magnitude (in volume) of CO2 used. Thank you.