Richmond, VA, June 5, 2002 -- Ondeo Degremont, Inc. has been awarded United States Patent Number 6,375,909 for inventing a method to remove mercury and nitrogen oxides from combustion flue gas.
Two employees -- Ky Dangtran, Ph.D., Senior Principal Engineer, and Troy Holst, Senior Engineer -- were the inventors.
Dangtran and Holst sought a method to reduce hazardous mercury and nitrogen oxide emissions during waste incineration.
In commercial scale studies at the Northwest Bergen County Utilities Authority Wastewater Plant in Waldwick, New Jersey, they determined that both mercury and nitrogen oxides could be converted into more soluble ash products through the injection of calcium chloride and through flue gas cooling.
Soluble products can then be removed from the combustion flue gas by absorption in a wet scrubber.
The technique to capture both hazardous gases is simple and cost-effective.
Ondeo Degremont, Inc. is the water engineering division of the Ondeo group, a fully owned subsidiary of SUEZ. Ondeo is a water solutions provider with presence in 130 countries and revenues of over $10 billion in 2001.