Frequent Questions

Does considering feedrate as MACT control mean that only the wastes with the lowest levels of metals or chlorine can be burned?

No. We identified the MACT levels of feedrate control used by the best performing sources in the aggregate for all metals-mercury, semivolatile metals, and low volatile metals -- and total chlorine. This ensures that the sources identified as having the lowest feedrates have the lowest feedrates for all 4 parameters simultaneously. (The feedrate for each source is normalized by its gas flowrate so that large sources are not penalized for having high feedrates per unit of time.) 

The MACT floor levels of feedrate control identified under this aggregate feedrate approach are generally representative of median feedrates -- they do not represent only the cleanest wastes. Thus, the feedrate control levels are readily achievable. 

For example, two of the three best feedrate-controlled incinerators are commercial incinerators. The floor feedrate control levels are being achieved by 70% of incinerators for mercury, 40% for semivolatile metals, 70% for low volatile metals, and 60% for chlorine. Thus, the feedrate control levels are not based on on-site incinerators at facilities that happen to generate relatively clean wastes.

For more information, see http://www.epa.gov/wastes/hazard/tsd/td/combustion.htm.

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