Mauro Roperto of Ahlstrom (Turin) SpA, with Andreas Mayer of TTM Switzerland and Christophe Peuchot of the Institute of Filtration and Separation (France)
Mauro Roperto has been adding fine meltblown and nano-fiber layers to wet-laid airfilter media and measuring their effects on initial efficiency and dust holding capacity using NaCl, DEHS (Di-Ethyl-Hexyl-Sebacate) and ISO-fine dust contaminants. This slide illustrates the effects of a nanofiber layer on the efficiency of HEPA filters, using the NaCl test.
Andreas Mayer of TTM (Switzerland) said all internal combustion engines emit 20-300 nm particles, and diesel soot, being invisible, odorless and tasteless is particularly dangerous. They are now being implicated in Alzheimers and Parkinsons diseases. This slide illustrates the effects of air pollution (in this case the ultrafine particles from diesel engines) on the mortality rates in 6 US cities.
Andreas Mayer's slide listing the projects for retrofitting high efficiency filters to diesel exhausts to reduce air pollution.