Majumdar, Deepanjan and Trivedi, Jitendra (2013) Memory effect driven emissions of persistent organic Pollutants from industrial thermal processes, their implications and management: A review. Journal of Environmental Management, 119. pp. 111-120. ISSN 0301-4797

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Memory effect is delayed emission of certain persistent organic pollutants (POPs). Many of the POP compounds viz. polycyclic aromatic hydrocarbons (PAHs), polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF) get trapped in the particulate phase deposited in the flue transfer lines and air pollution control systems (equivalent to storage in the memory of a system) and released subsequently. Memory effect driven emission is a combination of real time emission and emission of stored compounds and so is not a true measure of actual real time emission. Memory effect is now realized to have existed for a long time but was not identified and understood until recently. Memory effect has several serious implications e.g. it wrongly depicts emission patterns of POPs; it makes compliance to stipulated emission standards difficult; it could lead to wrong calculations of emission factors and emission inventory estimates of a plant and leads to misinterpretation of efficacy of processes and air pollution control systems. Further, new PCDD/Fs may be formed in the trapped particulate phase via de novo synthesis and the new compounds may be emitted, thereby increasing total PCDD/F emissions,apart from altering the homologue pattern of PCDD/Fs in emissions. Memory effect could be minimized by judicious operational and management (O&M) procedures like optimizing combustion, minimizing unnecessary halts in operations, periodical cleaning of flue transfer lines, application of inhibitors etc. �

Item Type: Article
Uncontrolled Keywords: Bag filter;Dioxin and furan;Incineration;PAH;Wet scrubber
Subjects: Air Pollution
Air Pollution Control
Depositing User: Dr. Deepanjan Majumdar
Date Deposited: 22 Feb 2014 07:38
Last Modified: 22 Feb 2014 07:52

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