Spray scrubber for nanoparticle removal from incineration fumes from the incineration of waste containing nanomaterials: Theoretical and experimental investigations
Résumé
Nanomaterials (NMs) are currently treated via recycling, incineration and/or landfilling at their
end-of-life. Little is known about the fate of NMs in incineration systems and the efficiency of
the available flue-gas cleaning technologies (FGCT) in these systems on the removal of NMs
before stack release. In combination with other FGCT such as cyclones, electrostatic precipitator
or bag filters, scrubbers participate to limit the release of particulate matter (PM) into the
atmosphere. No study has been carried out to investigate wet scrubber collection efficiency
regarding nanoparticles under conditions found in a waste incineration plant. In the present
study, experimental campaigns were carried out to quantify the performance of a pilot-scale
spray scrubber regarding the removal of nanoparticles. The pilot was designed with respect to
geometrical, hydrodynamic and residence time scale similitude and operated in gas tempera-
ture and humidity conditions representative of full-scale scrubbers in hazardous waste inciner-
ation plants. A collection efficiency of 45–62% for a particle size range of 12–90 nm was
reported. To evaluate the experimental results, an existing PM collection model based on the 3
main particle collection mechanisms of diffusion, interception and impaction, was adapted for
extreme humidity and gas temperature conditions typical of a waste incineration plant.
Domaines
Sciences de l'environnement
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