COMBINED PCDD/F DESTRUCTION AND PARTICULATE CONTROL IN A BAGHOUSE: EXPERIENCE WITH A CATALYTIC FILTER SYSTEM AT A MEDICAL WASTE INCINERATION PLANT

摘要

Phoenix Services, Inc. owns and operates the Baltimore Regional Medical Waste Incinerator in Baltimore,rnMaryland USA. New regulations for dioxins and furans imposed a limit that was considerably below historicalrnemission levels. In order to determine a method to comply with the new dioxin/furan regulations, Phoenix Servicesrnperformed trials with powdered activated carbon. Although the results with carbon were acceptable, PhoenixrnServices decided to replace their woven fiberglass filter bags with catalytic filters that simultaneously destroy dioxinsrnand furans and collect particulate matter. The catalytic filter system offered several advantages to PhoenixrnServices, including destruction of dioxins and furans instead of adsorption on carbon. The catalytic filters alsornoffered a passive solution that did not require new carbon injection equipment.rnIn January 2000, a campaign to measure dioxins/furans and particulate matter was undertaken. The measurementsrnallowed the catalytic filter system to be evaluated. Some of the key findings of this investigation are:rn1. The dioxin/furan emission was below 0.1 ng TEQ/Nm~3 @ 11% O_2.. This concentration is approximatelyrntwo orders of magnitude below historical averages and it is well below the new regulatoryrnlimits, for both existing and new sources of this type.rn2. The amount of dioxin/furans destroyed by the catalytic filters was approximately 1.73 ng TEQ/Nm~3rn@ 11% O_2.rn3. The particulate emission was 12-17 times lower than the regulatory limit.