Study on the countercurrent and cocurrent multistage operations of ozonation process ( I )
Date Issued
1999-07-31
Date
1999-07-31
Author(s)
張慶源
DOI
882211E002050
Abstract
An analysis is performed for
countercurrent and cocurrent multistage
bubble column reactors (BCRs) as well
as cocurrent multistage continuous
stirred tank reactors (CSTRs) of gasliquid
ozonation systems. The effects
of system variables on the ozonation
performance are examined. The system
variables under consideration include the
utilization efficiency of ozone, the
removal efficiency of pollutants, and the
emission concentration of ozone gas.
This analysis includes the effects of
ozone decomposition and the ozonation
of pollutants on the ozone mass transfer
(i.e., enhancement factor, Er), the
variation of pressure along the column,
and the dispersion effect. The
application of multistage CSTRs has the
advantages to increase the utilization
efficiency of ozone, to decrease the
emission concentration of ozone gas,
and to reduce the total volume of
reactor. The ozonation performances
of countercurrent and cocurrent CSTRs
are about the same. For BCR system,
the ozonation performance of multistage
is close to that of sigle stage. Both
countercurrent and cocurrent BCRs give
nearly the same ozonation performance.
The results of this study can provide the
useful information for the rational
design of ozonation contactor, and are of
importance for the treatment ofpollutants via ozonation.
Subjects
ozone
ozonation
multi-stage
reactor
reactor
countercurrent operation
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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