The hazardous waste and municipal waste standards are actually very similar, particularly for the key pollutants -- dioxins, furans, and mercury. It is important to remember that our Clean Air Act sets out a technology-based approach for setting limits for existing facilities on a category-by-category basis. Therefore, standards for Municipal Waste Combustors (MWCs) and hazardous waste burners are calculated based on different facilities and on different historical performance data.
Our standards and those in Europe are also very close to each other. Although some methods for measuring emissions and the legal structure in which we are both working are different, the standards for dioxins and furans are virtually identical. For metals, the numbers are also quite close. See table below:
Municipal Waste and European Standards Versus HWC Standards(Existing Sources Only)
|Large Existing Municipal Waste Combustors||European Union Hazardous Waste Combustors||HW Incinerators||HW Cement Kilns||HW Lightweight Agg. Kilns|
|0.5-1.02||0.19||0.20 or 0.40 plus off-gas T quench to 400F3||0.20 or 0.40 plus off-gas T quench to400F3||0.20 or 0.40 plus off-gas T quench to400F3|
|27||39||34||0.15 kg/Mg dry feed and opacity less than 20 percent.||57|
|Semi-Volatile Metals (ug/dscm)
-- cadmium and lead
|Low Volatility Metals (ug/dscm)
- antimony, arsenic, beryllium, and chromium
|HCl and Cl2
1 TEQ refers to 2,3,7,8-TCDD toxicity equivalence, the method of relating the toxicity of various dioxin/furan congeners to the toxicity of 2,3,7,8-tetrachlorodibenzo(p)dioxin.
2 In the MWC final rule, the dioxin/furan standard is expressed as either 30 or 60 ng/dscm for all dioxin/furan congeners (depending on whether a fabric filter/baghouse or an electrostatic precipitator is used by the facility). This standard is equivalent approximately to 0.5 to 1.0 ng/dscm TEQ.
3 When gas temperatures are quenched to 400F, D/F emissions are typically 0.20 ng/dscm.