| Summary: | 碩士 === 國立中央大學 === 環境工程學系 === 85 === AbstractIn biological wastewater treatment systems, the removal
efficiency of organic pollutants is depended on the operational
parameters and conditions, and is correlatedwith the species of
microorganism and its activities. Therefore, it is required
to maintain the species and its activities in processes control
of biological wastewater treatment systems.In continue-flow
sequencing batch reactor (CF-SBR) system, the main difference
between the fixed-time and the real-time control is the foremost
set the operation phase time in fixation to make sure the
nitrification and denitrification are completed, thehindmost are
real-time adjusts the cyclic duration to meet a time of
treatment needs by on-line monitoring process parameters (pH,
oxidation reduction potential and dissolved oxygen), it made the
processes more flexible than the foremost. As mentioned above,
base on the different character of two control strateges, the
experiments of CF SBR using the real-time control show that the
aerobic and anaerobic duration are shorter than fixed-time
control in general. In order to know the effect of CF SBR system
under the real-time control operation, this research measures
the oxygen uptake rate in batch-tests to identify the activities
of nitrosomonas and nitrobacter, and determine kinetics
parameters of nitrification, includes maximum substrate removal
rate, half-saturation coefficient and inhibit constant. It also
measures the specific nitrate and nitrite utilization rates of
denitrification with different COD: N ratio in batch-tests for
investigation the kinetic of ammonia removal.The results of
experiments shown that 1. nitrification kinetic parameters of
fixed-time control strategy are r0,m=27.6 mg O2/g-hr, Kn=1.12
mg/l, Ki=4.92 mg/l for nitrosomonas and r0,m=9.0 mg O2/g-hr,
Kn=0.7 mg/l, Ki=49.4 mg/l for nitrobacter. Nitrification kinetic
parameters of real-time control strategy are r0,m=27.7 mg O2/g-
hr, Kn=1.13 mg/l, Ki=5.91 mg/l for nitrosomonas and r0,m=7.9 mg
O2/g-hr, Kn=0.84 mg/l, Ki=54.97 mg/l for nitrobacter, the
kinetic parameters of both fixed and real-time control are
similar. 2. both control strategies makes the same
denitrofication rate in the same COD:N ratio. Otherwise, the
aerobic duration measurement for real-time control is only about
3/4 of fixed-time control per day. These results indicate that
using the real-time control not only can enhance the operation
efficient of CF SBR system but can also maintain the same
kinetic quality as using the fixed-time control.
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