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Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly
2009 Vol.10 No.5 P.732-738
Novel photocatalytic reactor for degradation of DDT in water and its optimization model
Abstract: A novel photocatalytic reactor was developed to remove (1,1-bis(4-chlorophenyl)-2,2,2-trichloroethane) (DDT) from water. In the reactor, a cenosphere was used to support TiO2 film made by means of sol-gel. Because the cenospheres were coated with TiO2, their specific gravity was slightly increased from the original 0.6~0.8 to 0.8~0.9, so that they were able to be suspended in water. With the mixed operation of a bubbler, the water in the reactor was in a well-fluidized state. The bottom of the reactor is a sand filter bed, which can be used to prevent the photocatalyst from being lost. A mathematical model of the reactor has been developed in the two primary influential factors: ultraviolet (UV) light intensity and photocatalyst concentration. With such a model, the reactor can be designed more reasonably.
Key words: Photocatalytic reactor, Persistent organic pollutants (POPs), Reactor model
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1. Introduction
Photocatalytic reactors can be employed to eliminate pollutants
from water and air streams. Different photocatalytic reactor configurations
have been proposed for such applications. One of the most
promising alternatives is the fluidized bed photocatalytic reactor
(FBPR) (Dibble and Raupp 1992; Haarstrick et al. 1996; Chiovetta
et al. 2001; Kumazawa et al. 2003; Lee et al. 2004 2006; Lim and
Kim 2004 2005; Pozzo et al. 1999 2000 2005; Nelson et al. 2007).
Among the advantages offered by FBPRs are the efficient contact between
the catalyst and the pollutants the low mass transfer resistances
the low pressure drop and the high TiO2 surface exposure
to UV-radiation. Besides FBPRs with an annular-type configuration
could enable a more efficient use of the radiation emitted by UV
lamps.
For design and optimization purposes modeling of the radiation
distribution inside photocatalytic reactors is essential because
DOI:
10.1631/jzus.A0820501
CLC number:
X703.3
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Received:
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Revision Accepted:
2024-05-08
Crosschecked:
2009-02-26