Environ. Sci. Technol. 2008, 42, 2111–2117
Reduction of Dioxin-like Compound Emissions from a Waelz Plant with Adsorbent Injection and a Dual Baghouse Filter System K A I H S I E N C H I , †,‡ S H U H A O C H A N G , † A N D M O O B E E N C H A N G * ,† Graduate Institute of Environmental Engineering, National Central University, Chungli 320, Taiwan., and Research Center for Environmental Changes, Academia Sinica, Taipei 115, Taiwan
Received September 24, 2007. Revised manuscript received November 22, 2007. Accepted December 27, 2007.
Previous study indicates that the polychlorinated dibenzo-pdioxin and -dibenzofurans (PCDD/F) concentration measured in the stack gas of the Waelz plant investigated reached 194 ngTEQ/(N m3) (TEQ ) toxic equivalence), due to the relatively high potential of PCDD/F formation and a low PCDD/F removal efficiency (99.8%) achieved at a lower adsorbent injection rate (16 kg/h) of the adsorbent injection + DBF system also significantly reduced the total PCDD/-F and PCB emission flows (per kg of electric arc furnace dust treated) to 1925 ng-I-TEQ and 30.5 ng-TEQWHO, respectively.
Introduction Polychlorinated dibenzo-p-dioxins and -dibenzofurans (PCDD/Fs) and polychlorinated biphenyls (PCBs) can be * Corresponding author e-mail:
[email protected] † National Central University. ‡ Academia Sinica. 10.1021/es702396y CCC: $40.75
Published on Web 02/19/2008
2008 American Chemical Society
formed in combustion processes in the presence of a carbon source and chlorine (1, 2). Emission of PCBs originally present in the combustion materials is also possible, if the combustion temperature is not high enough (
