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Catalytic destruction vs. adsorption in controlling dioxin emission
Wei Ting Hsu1, Pao Chen Hung1, Moo Been Chang1
1Graduate Institute of Environmental Engineering, National Central University, 300 Jhong-da Road, Jhongli, Taoyuan 32001, Taiwan, Republic of China.
Waste Management (New York, N.Y.)
|September 10, 2015
Summary
Catalytic filtration (CF) offers superior removal of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) compared to activated carbon injection with a bag filter (ACI+BF). CF technology effectively destroys PCDD/Fs, reducing ash disposal costs.
Area of Science:
- Environmental Science
- Chemical Engineering
- Pollution Control
Background:
- Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) are persistent organic pollutants requiring effective removal from incineration emissions.
- Conventional methods like activated carbon injection with bag filters (ACI+BF) transfer PCDD/Fs to solid waste, increasing ash concentration.
- Catalytic filtration (CF) presents an alternative technology for PCDD/F abatement.
Purpose of the Study:
- To compare the PCDD/F removal efficiencies of catalytic filtration (CF) and activated carbon injection followed by bag filter (ACI+BF) systems.
- To evaluate the PCDD/F concentrations in the ash generated by both systems.
- To establish PCDD/F emission factors for industrial and hazardous waste incinerators.
Main Methods:
- Investigated PCDD/F removal efficiencies in an industrial waste incinerator (IWI) using CF and a hazardous waste incinerator (HWI) using ACI+BF.
- Measured PCDD/F concentrations in gas streams and in the resulting filter ash.
- Calculated PCDD/F emission factors for both incineration processes.
Main Results:
- CF demonstrated higher PCDD/F removal efficiency compared to the ACI+BF system.
- PCDD/F emissions from both incinerators met the regulatory limit of 0.1 ng I-TEQ/Nm(3).
- CF ash had significantly lower PCDD/F concentration (0.274 ng I-TEQ/g) than BF ash (exceeding Taiwan's 1.0 ng I-TEQ/g limit), indicating effective destruction by CF.
Conclusions:
- Catalytic filtration is more effective than ACI+BF for PCDD/F removal, as it destroys rather than merely transfers the pollutants.
- CF technology leads to lower PCDD/F concentrations in ash, potentially reducing disposal costs.
- CF technology offers a more sustainable solution for managing PCDD/F emissions from waste incineration.
Keywords:
Activated carbon injectionCatalytic filterHazardous waste incineratorIndustrial waste incineratorPCDD/FsMore Related Videos
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