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57 <br />industries, and were found to be a major dioxin source. In 1995, amendments to <br />the Clean Air Act (CAA) were enacted to control the emissions of dioxins, as well as <br />other toxins, such as mercury, hydrogen chloride and particulate matter. <br />With the implementation of the CAA requirements in the following years, dioxin <br />emissions from WTE decreased significantly, as shown in Figure 5 -1.14 The U.S. EPA <br />has stated that "Waste -to- Energy is no longer a major contributor of dioxin <br />emissions." <br />Figure 5 -1. Dioxin Emissions from WTE Facilities, 1990 — 2005 <br />1990 1993 1996 1999 2000 2005 <br />Year <br />Mercury is another toxin that was found in WTE exhaust and that was addressed in <br />the CAA amendments. By modifications in the burning process and the use of <br />activated carbon injection in the air pollution control system, dioxins and mercury, as <br />well as hydrocarbons and other constituents, have effectively been removed from the <br />gas stream. Mercury emissions from WTE have been reduced from 1990 levels, as <br />shown in Figure 5 -2.15 <br />Figure 5 -2. Mercury Emission from WTE Facilities, 1990 - 2005 <br />50.0 <br />CL <br />40.0 <br />4 <br />A 30.0 <br />W <br />zu.0 <br />4 <br />100 <br />&O <br />51.2 <br />30.5 <br />23.7 <br />16.9 <br />6.06 <br />1990 1993 1996 1999 2000 <br />Year <br />4.05 <br />2005 <br />14 Emissions from Large MWC Units at MACT Compliance, Docket A -90 -45 (Large MWCs), U.S. <br />EPA, Research Triangle Park, NC. <br />15 Ibid. <br />GBB/C08027 -01 28 August 15, 2008 <br />4,500 <br />rn <br />4,000 <br />M <br />3,500 <br />M <br />3,000 <br />Q <br />iy <br />2,500 <br />0 <br />2,000 <br />^ <br />1 ,500 <br />E <br />W <br />.w <br />1 ,000 <br />O <br />500 <br />0 <br />1990 1993 1996 1999 2000 2005 <br />Year <br />Mercury is another toxin that was found in WTE exhaust and that was addressed in <br />the CAA amendments. By modifications in the burning process and the use of <br />activated carbon injection in the air pollution control system, dioxins and mercury, as <br />well as hydrocarbons and other constituents, have effectively been removed from the <br />gas stream. Mercury emissions from WTE have been reduced from 1990 levels, as <br />shown in Figure 5 -2.15 <br />Figure 5 -2. Mercury Emission from WTE Facilities, 1990 - 2005 <br />50.0 <br />CL <br />40.0 <br />4 <br />A 30.0 <br />W <br />zu.0 <br />4 <br />100 <br />&O <br />51.2 <br />30.5 <br />23.7 <br />16.9 <br />6.06 <br />1990 1993 1996 1999 2000 <br />Year <br />4.05 <br />2005 <br />14 Emissions from Large MWC Units at MACT Compliance, Docket A -90 -45 (Large MWCs), U.S. <br />EPA, Research Triangle Park, NC. <br />15 Ibid. <br />GBB/C08027 -01 28 August 15, 2008 <br />