Assessment of some organic pollutants from combustion processes. Preliminary results of laboratory and field tests
Italian Law on emission limitation and control requires 54 organic compounds to be determined in the flue gases of industrial combustion plants. These compounds show very different chemical and physical characteristics (e.g. volatility, stability, reactivity with water …). Some of these compounds (i.e. PAH, PCDD/PCDF, VOC) are commonly monitored in emissions of Large Combustion Plants, but for the majority of them a validated standard method doesn’t exist, neither at Italian nor at international level.
A preliminary laboratory investigation has therefore been performed, which allowed to focus on the most promising methods for some of the above mentioned compounds. During this phase, US-EPA, OSHA and NIOSH methods, together with the technical literature, have been reviewed and some tests have been performed on a small scale test rig.
The selected methods have then been field tested on a low-sulfur heavy fuel oil fired power plant, equipped with ESP and SCR, and on a coal-fired power plant, equipped with ESP, FGD and SCR (the results of this last test are only partially accounted for in this paper, because lab analyses are still in progress).
Experimental tests performed allowed to select and verify –at least in a preliminary way- a series of procedures suitable for the sampling in combustion flue gases of about 30 organic pollutants.