Removal of dioxins and related aromatic hydrocarbons from flue gas streamsby adsorption and catalytic destruction

The dioxin removing capacity of the shell dedioxin system (SDDS - a Ti/V ox idative type catalyst) has: been tested using the Umea lab-scale incinerato r over the temperature range 100-230 degreesC and at space velocities of 80 00 and 40,000 h(-1). Other analogous organic compounds, such as PCBs, PAHs, chlorobenzenes and chlorophenols have also been investigated. Results show a high degree of dioxin removal already at 100 degreesC (82%), which occur s mainly by adsorption. When the temperature is raised a transition towards destruction is seen and at 150 degreesC, gas hour space velocity (GHSV) 80 00 and at 230 degreesC, GHSV 40,000 virtually all removal is by destruction . High PCDD/F destruction efficiencies are reported (> 99.9%, based on T-TE Q); the other dioxin-related species and PAHs are also removed and destroye d to a significant extent. The SDDS has proved to be an effective means of destroying organic compounds in the gas phase, particularly dioxins, at tem peratures as low as 150 degreesC. (C) 2001 Elsevier Science Ltd. All rights reserved.