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Population increases and economic growth place greater demand on water resources.
Praxair has developed three technologies that help customers reduce the amount of
infectious agents and harmful chemical compounds in
wastewater.
Our proprietary ISO™ (in-situ oxygenation)
technology replaces the air normally used in conventional wastewater treatment systems
with oxygen. This doubles the capacity of the microorganisms that convert organic pollutants
into harmless compounds. The use of oxygen also substantially reduces harmful emissions
to the air and lowers energy consumption. Praxair oxygenation systems are also used in
reservoirs to reduce stagnation and create a healthy environment for fish and other organisms.
Carbon dioxide is used to reduce the pH of wastewater that is
too alkaline. When carbon dioxide is added to water, it forms carbonic acid, which serves
to reduce the pH of the water so that it matches the pH of water found in the environment.
Carbon dioxide is safer to use and provides better control than stronger chemicals like sulfuric acid.
Ozone is used to neutralize harmful chemicals. Ozone is more effective
than chlorine in destroying bacteria and does not leave any harmful residual compounds. In addition,
ozone is created on-site, eliminating the potential safety problems associated with shipping and handling chlorine.
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Oxy-fuel combustion
technologies are used in a variety of industries, such as glass or steel production, or in waste incineration.
Using oxygen or oxygen-enriched air instead of air alone in the combustion process increases the flame
temperature, which provides more complete combustion of the fuel source. Typical benefits for a glass-melting
furnace or steel reheating furnace converting from air to oxy-fuel are: up to 50% fuel savings, 35% productivity
increase and 80% lower nitrogen oxide emissions.
Praxair’s patented CoJet® gas injection technology reduces
waste and increases productivity of basic oxygen furnaces in steel-making. Recent tests have shown productivity
improvements of 15% along with significant increases in yield.
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