Frequent Questions

Why are many of the final Hazardous Waste Combustion Emission Standards higher than the proposed standards?

Some final standards are higher than the proposed standards because we determined that, based on public comment and reanalysis, stringent beyond-the-floor standards are not cost-effective. Examples are dioxin/furan and mercury beyond-the-floor standards based on activated carbon injection. The dioxin/furan standards would have cost more than $660,000 per gram of TCDD-TEQ  reduced, and the mercury standards would have cost more than $6 million per megagram of mercury reduced. In other cases, higher final standards are attributable to additions and corrections to the emissions data base and revisions to the methodology we used to identify the floor emission level.
 
We also note that several final standards are lower than those proposed including: (1) the particulate matter, semivolatile metal, low volatile metal, and total chlorine standards for incinerators; 
(2) the low volatile metal and total chlorine standards for cement kilns; and 
(3) the particulate matter, low volatile metal, and total chlorine standards for lightweight aggregate kilns.

For more information, see http://www.epa.gov/epaoswer/hazwaste/combust/.

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