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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.
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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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Aerator Performance Testing 
