This powerpoint presentation begins by providing a brief overview of the motivation behind this study: volatile organic compounds (VOCs) cause significant adverse effects on
human health and the environment; they are important indoor air pollution
contaminants; and, largely used in industrial operations as
solvents, VOCs are a common source for
subsurface contamination of drinking water
supplies. Conventional and alternative treatment
technologies for VOC removal and their disadvantages are listed, along with the challenges of TiO<sub>2</sub> Photocatalysis
for large scale implementation. Research objectives are presented: to design a photocatalytic reactor that can efficiently
remove VOCs in the gas and aqueous phases
simultaneously; and, to overcome major difficulties to implement PCO at
the large scale. The proposed treatment system is presented, including: the reactor
(TPOT) with toluene as the target contaminant; commingled packing; STCs characterization; UV intensity distribution
in TPOT; single phase adsorption of
toluene in TPOT; gas phase toluene
photocatalysis; aqueous phase toluene
photocatalysis; two-phase toluene
photocatalysis; and, parameters affecting toluene
removal in two-phase system. Conclusions indicate that: wetting of the packing completely inhibited gas
phase toluene photocatalysis; the oxidation of toluene is at the surface of the
catalyst and not in the bulk phase; when both phases are flowing simultaneously in
the TPOT, the conversion of toluene occurs at
the liquid/catalyst interface; higher removals than those found in the single
phase system can be achieved in the two phase
system under optimum operating conditions; main advantage of two phase system is
versatility, it can handle fluctuations to avoid
stressing or overloading the system; and, although designed for VOCs, TPOT results
show the system's potential for removal of low
Henry's constant compounds. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 24 |
| Published : | 11/01/2009 |
