| Summary: | 碩士 === 國立中央大學 === 環境工程研究所 === 83 === Wet Air Oxidation (WAO) process was used in this study
alternatively to investigate the characteristic of the COD
removal and BOD5/COD enhancement. Reaction temperature, time,
and oxygen supply are considered to be important factors
affecting the degradation of the PCBW. A three-factorial
experiment was designed with temperature ranged from 210-270
deg C, oxygen supply 1.0-1.5 times COD, and reaction time 0-60
min. The result of the experiments showed that reaction
temperature, time and oxygen supply are all important factors.
The maximum reaction rate occurred at time 5-15 min. from the
beginning of the reaction. The increase in COD concentration
in the first five minutes indicated that in the solids in PCBW
released some organic polymer which was not accounted by the
COD analysis of the initial PCBW. The releasing was enchanted
by increasing temperature and oxygen supply. The maximum COD
and TOC reduction, 49.9% and 54.1% were found at reaction
temperature 270 deg C and 1.5 time oxygen supply to COD after
60 min of reaction. The maximum ratio of BOD5/COD was raised
to 0.65. The reaction rate of COD can be predicated by a model
of two first order reactions in series. A COD reaction rate
model was established. The reaction order within 15-60 min. is
unit for COD degradation and 0.23 for oxygen supply. The
activation energy (Ea) was found to be 23160 J/mole.
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