Carbon dioxide is a colourless, odourless, non-flammable and slightly acid gas. It is produced by different processes in the petrochemical industry, or by natural gas combustion in cogeneration plants.

The main water treatment applications with CO₂ are recarbonation and pH control. With the recarbonation process, the principal objective is to increase the hardness of potable water arising from a reverse osmosis process, maintaining the equilibrium between carbonate, bicarbonate and free carbon dioxide.

With pH control, the carbon dioxide acts as a mineral acid substitute for reducing the alkaline water pH, in accordance with the environmental rules. Carbon dioxide is less prone to overdosing than sulphuric and other mineral acids, and is safer to handle on site.

These applications are very interesting for all industrial sectors which have these needs. Air Products has important references in the food, petrochemical, textile, soap and pulp & paper industries, and in the public segment, drinking water and wastewater treatment plants.

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