How to Neutralize the pH value of Aggressive Water
To remove the aggressive carbon dioxide (CO2) that can react with limestone and materials like concrete, it is necessary to neutralize the water. This neutralization process always results in an increase of the pH level, making the water less acidic.
There are several methods that can be employed to achieve this neutralization pH value of aggressive water:
1. Aeration/Gas Transfer: This method involves exposing the water to air, which facilitates the removal of the dissolved CO2 through a gas transfer process. As the CO2 is released, the pH of the water increases, reducing its acidity.
2. Limestone Filtration: Passing the water through a limestone (calcium carbonate) filter allows the limestone to react with the dissolved CO2, converting it into bicarbonate. This process neutralizes the water, increasing its pH.
3. Dosing of a Base: The addition of a basic (alkaline) substance, such as lime (calcium oxide) or sodium hydroxide, can effectively neutralize the acidity in the water. When the base is added, it reacts with the dissolved CO2, raising the pH and reducing the water’s acidity.
These methods of neutralizing the pH value of aggressive water can be employed individually or in combination, depending on the specific water chemistry, desired pH level, and the requirements of the application or treatment process. The choice of the most appropriate neutralization technique will depend on factors such as the initial water quality, the desired degree of neutralization, and the practical and economic considerations of the water treatment system.
