7.8 Description of Continuous Study
103
7.8.2 Procedure for Continuous Study
There are 9 (nine) numbers of continuous runs each of 72 h performed on the reactor
with 3 (three) variations of HRT and three (3) variations of input biomass concentrations. The reactor was allowed to run by means of peristaltic pump until quasisteady-state condition reached. The adequate aeration was ensured in the reactor
with the high-flow air pump. The effluent sample was taken from the overflow of
the secondary clarifier for measuring final COD concentration, whereas the reactor
content was taken for determining steady-state suspended biomass concentration. A
portion of attached media (perspex sheet) was also washed out with 0.1 N NaOH
solution to measure the protein concentration and thereby the attached biomass. The
results of continuous study with municipal wastewater are shown in Table 7.4.
7.9 Compatibility of Fixed-Bed Hybrid Bioreactor
for Municipal Wastewater Treatment
The present continuous study has been carried out to evaluate the performance of
a fixed-bed aerobic hybrid bioreactor for removal of carbonaceous organic matter
from municipal wastewater. Various experimental combinations have been made to
obtain optimum results in terms of COD removal efficiency. COD removal profiles
obtained from various experimental studies suggest that more than 85% COD removal
is possible with initial COD concentration 151 mg/l and initial MLSS concentration
3000 mg/l at a hydraulic retention time of 8 h. Thus, optimum results are obtained at
MLSS concentration 3000 mg/l and at a hydraulic retention period 8 h corresponding
to attached biomass concentration of 1000 mg/l. The rate of biodegradation may be
enhanced by means of additional biomass present in the attached surface, in turn by
increasing the total biomass concentration.
103
7.8.2 Procedure for Continuous Study
There are 9 (nine) numbers of continuous runs each of 72 h performed on the reactor
with 3 (three) variations of HRT and three (3) variations of input biomass concentrations. The reactor was allowed to run by means of peristaltic pump until quasisteady-state condition reached. The adequate aeration was ensured in the reactor
with the high-flow air pump. The effluent sample was taken from the overflow of
the secondary clarifier for measuring final COD concentration, whereas the reactor
content was taken for determining steady-state suspended biomass concentration. A
portion of attached media (perspex sheet) was also washed out with 0.1 N NaOH
solution to measure the protein concentration and thereby the attached biomass. The
results of continuous study with municipal wastewater are shown in Table 7.4.
7.9 Compatibility of Fixed-Bed Hybrid Bioreactor
for Municipal Wastewater Treatment
The present continuous study has been carried out to evaluate the performance of
a fixed-bed aerobic hybrid bioreactor for removal of carbonaceous organic matter
from municipal wastewater. Various experimental combinations have been made to
obtain optimum results in terms of COD removal efficiency. COD removal profiles
obtained from various experimental studies suggest that more than 85% COD removal
is possible with initial COD concentration 151 mg/l and initial MLSS concentration
3000 mg/l at a hydraulic retention time of 8 h. Thus, optimum results are obtained at
MLSS concentration 3000 mg/l and at a hydraulic retention period 8 h corresponding
to attached biomass concentration of 1000 mg/l. The rate of biodegradation may be
enhanced by means of additional biomass present in the attached surface, in turn by
increasing the total biomass concentration.