Abstract
A practical and long-term usable air-cleaner based on the synergy of photocatalysis and plasma treatments has been developed. A field test of the air-cleaner was carried out in an office smoking room. The results were compared to previously reported laboratory test results. Even after a treatment of 12,000 cigarettes-worth of tobacco smoke, the air-cleaner maintained high-level air-purification activity (98.9% ± 0.1% and 88% ± 1% removal of the total suspended particulate (TSP) and total volatile organic compound (TVOC) concentrations, respectively) at single-pass conditions. Although the removal ratio of TSP concentrations was 98.6% ± 0.2%, the ratio of TVOC concentrations was 43.8% after a treatment of 21,900 cigarettes-worth of tobacco smoke in the field test. These results indicate the importance of suitable maintenance of the reactors in the air-cleaner during field use.
Highlights
Photocatalysis-plasma synergistic reactors have been recently proposed for use in air-cleaners [1,2,3,4].The synergistic effects of photocatalysis and plasma excitation achieve significant oxidative decomposition of gaseous compounds in laboratory tests
Ozone and NOx concentrations near the reactors in the air-purifier were 8–9 and 0.7–0.8 ppm, respectively under a 1200 m3/h flow rate. These species can accelerate the decomposition of TVOCs [1]
Ozone and NOx concentrations at the air-outlet of the air-cleaner were below the detection limit
Summary
Photocatalysis-plasma synergistic reactors have been recently proposed for use in air-cleaners [1,2,3,4]. The coil-shaped reactor (Figure 1), using plasma-assisted catalytic technology (PACT) [5] and a TiO2 impregnated Ti-mesh filter (TMiPTM) [6], shows long-term capability of removing tobacco smoke compounds. A field test of the air-cleaner using the coil-shaped reactor was carried out for 84 days in a functioning smoking room (Figure 2) of a typical office building. The air-purification ability and the long-term usability of the air-cleaner in the smoking room were discussed by comparison with previously reported laboratory test results. The air-cleaner consists of HEPA filter, PACT-TMiP reactor x 10, activated carbon filter, O3-cut filter, and fan air flow rate≥1,200 m3/h air in air outlet tobacco smoke air flow air in air inlet (side view)
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