The AF reactor was inoculatedwith 10 m3
of sludge
obtainedfrom a 5000 m3
anaerobic digester in a
municipal wastewater treatment plant. The solids content of this inoculum was 15 g VSS/l, with a rather low
methanogenic activity, around0.13 kg COD/kg VSS d.
Therefore, the potential removal capacity can be
estimatedas 1.63 kg COD/m3
d.
The system was started-up by feeding a certain
amount of wastewaters into the reactor once per day,
while continuously maintaining the recycling flow rate.
The initial OLR appliedamountedto 20% of the
potential removal capacity, so during the first 3 weeks
only 0.6 m3
/d was fed, which corresponded to a HRT of
20 days and an OLR of 0.33 kg COD/m3
d. During the
first weeks, the purpose was to get a proper inoculum
distribution amidst the support, and to acclimate the
biomass to the wastewaters.
Afterwards, the input flow was doubled to 1.2 m3
/d,
which was maintainedfor 2 weeks, andlater on was
doubled again to 2.4 m3
/d, which corresponds to 5 days
of HRT andan OLR level similar to the potential COD
removal of the inoculum. This level was maintainedfor
6 weeks. During all these days the behaviour of the
process was adequate, with COD removal rates higher
than 90% andno signs of instability.
The final stage of the start-up periodcomprisedthe
last 3 weeks of operation, when an input flow of
3.6 m3
/dwas fed(3.33 days of HRT). The average OLR
appliedwas 2.8 kg COD/m3
dandCOD removal effi-
ciencies of 91.8% were obtained(Table 4). Relatively
low alkalinity (950 mg/l) was detected which explains the
high alkalinity ratio obtainedin the effluent of the
reactor
The AF reactor was inoculatedwith 10 m3
of sludge
obtainedfrom a 5000 m3
anaerobic digester in a
municipal wastewater treatment plant. The solids content of this inoculum was 15 g VSS/l, with a rather low
methanogenic activity, around0.13 kg COD/kg VSS d.
Therefore, the potential removal capacity can be
estimatedas 1.63 kg COD/m3
d.
The system was started-up by feeding a certain
amount of wastewaters into the reactor once per day,
while continuously maintaining the recycling flow rate.
The initial OLR appliedamountedto 20% of the
potential removal capacity, so during the first 3 weeks
only 0.6 m3
/d was fed, which corresponded to a HRT of
20 days and an OLR of 0.33 kg COD/m3
d. During the
first weeks, the purpose was to get a proper inoculum
distribution amidst the support, and to acclimate the
biomass to the wastewaters.
Afterwards, the input flow was doubled to 1.2 m3
/d,
which was maintainedfor 2 weeks, andlater on was
doubled again to 2.4 m3
/d, which corresponds to 5 days
of HRT andan OLR level similar to the potential COD
removal of the inoculum. This level was maintainedfor
6 weeks. During all these days the behaviour of the
process was adequate, with COD removal rates higher
than 90% andno signs of instability.
The final stage of the start-up periodcomprisedthe
last 3 weeks of operation, when an input flow of
3.6 m3
/dwas fed(3.33 days of HRT). The average OLR
appliedwas 2.8 kg COD/m3
dandCOD removal effi-
ciencies of 91.8% were obtained(Table 4). Relatively
low alkalinity (950 mg/l) was detected which explains the
high alkalinity ratio obtainedin the effluent of the
reactor
การแปล กรุณารอสักครู่..
