Use of regenerated ferric oxide for CO destruction and suppressing dioxin formation in flue gas in a pilot-scale incinerator
Resource
Chemosphere 53 (7): 727-735
Journal
Chemosphere
Journal Volume
53
Journal Issue
7
Pages
727-735
Date Issued
2003
Date
2003
Author(s)
Hung, Wen-Tsung
Abstract
Catalytic destruction of chlorinated compounds is one of the key methods in reducing pollutant emissions. For the purpose of utilizing waste materials, a catalyst was regenerated from ferric ion sludge, obtained from the addition of iron salts to precipitate heavy metals. The sludge was dewatered, heated (800°C for 4 h), and ground into smaller particles. The regenerated ferric oxide particles were then used as the oxidation catalyst to destroy CO formation during the combustion of three chlorinated solvents and to suppress dioxin formation in flue gas in a real waste solvent. In the presence of catalyst, the combustion efficiency (ratio of CO2 to the sum of CO2 and CO) for chlorobenzene was more than 98% at 850°C in a pilot-scale incinerator. The destruction and removal efficiencies of chlorobenzene, 2,4-dichlorophenol and trichlorofluoroethane were more than three nines. In the absence of catalysts, the flue gas emission from a real waste could not meet the regulatory dioxin standard of 0.1 ng-TEQ/N m 3 even with the powdered activated carbon injection. The use of catalyst at either 100 or 300 g/h, however, was able to meet the emission standard. © 2003 Elsevier Ltd. All rights reserved.
Subjects
Carbon monoxide; Catalyst; Chlorinated compounds; Combustion; Dioxins
Other Subjects
Carbon monoxide; Catalysis; Catalysts; Chlorination; Combustion; Flue gases; Gas emissions; Heavy metals; Iron oxides; Sewage sludge; Waste utilization; Pilot-scale incinerators; Refuse incinerators; 2,4 dichlorophenol; carbon dioxide; carbon monoxide; chlorobenzene; dioxin; ferric oxide; heavy metal; iron; solvent; trichlorofluoromethane; ferric ion; ferric oxide; Carbon monoxide; catalyst; chlorinated hydrocarbon; Combustion; dioxin; Emission control; flue gas; iron oxide; article; catalyst; chlorination; combustion; dewatering; flue gas; heating; incineration; oxidation; pilot study; precipitation; sludge; waste gas management; air pollutant; catalysis; chemistry; mass fragmentography; methodology; scanning electron microscopy; Taiwan; waste disposal; Air Pollutants; Carbon Monoxide; Catalysis; Dioxins; Ferric Compounds; Gas Chromatography-Mass Spectrometry; Incineration; Microscopy, Electron, Scanning; Refuse Disposal; Taiwan
Type
journal article
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