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Sulfur Dioxide (SO2) is created when air (which is 78% nitrogen, 20% oxygen
and 2% inert gases) used for combustion combines with sulfur in the fuel. Sulfur Dioxide
can be a byproduct of any combustion processes that have fuel with sulfur in it, whether it
is burning leaves in your backyard or a power plant burning oil, coal or trash. All these fuels
have sulfur in them. We inject lime into the Spray Dryer Absorbers
(SDAs or scrubbers) to absorb, neutralize and remove sulfur dioxide in the emissions. This plant
has a sulfur dioxide permit limit established by the Department of
Environmental Protection that requires either of the following: a limit of 29 parts per million
(29 ppm) of sulfur dioxide in the emissions (corrected to 7% oxygen) OR else we are required
to remove over 75% of the sulfur dioxide (75% RE or Removal Efficiency) in the emissions. Modern
trash-to-energy plants like this one are required by the regulatory agencies to achieve either standard
(29 ppm OR 75% RE), not necessarily both.
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Notes:
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