Environmental Engineering Reference
In-Depth Information
Table 5.1.
Influent and effluent qualities of the BioMax ATUs before modification of the
aeration regime
Parameters
Influent
(mean value)
Effluent
(mean value)
Removal
efficiency (%)
Nitrate-N
Ammonia-N
Phosphorus
Suspended solids
BOD
5
36.3 mg/l
8.54 mg/l
5.9 mg/l
39.2 mg/l
77.2 mg/l
41.1 mg/l
14.6 mg/l
5.4 mg/l
25.0 mg/l
22.2 mg/l
-
-
8.5
36.2
71.2
Table 5.1
lists the mean results of influent and effluent qualities before modifica-
tion. It indicates that phosphorus, suspended solids and BOD showed some
amount of decrease in the effluent whereas there was an appreciable increase in
the nitrate and ammonia concentration levels. The mean values indicated that, ni-
trate levels increased from 36.3 mg/l to 41.1 mg/l. Ammonia concentration also
increased from 8.54 mg/l to 14.6 mg/l. However, there was some decrease in
phosphorus concentration from 5.9 mg/l to 5.4 mg/l. This represents about 8.5%
removal efficiency of the influent concentration. Suspended solids also decreased
from 39.2 mg/l to 25.0 mg/l indicating 36.2% removal efficiency. BOD on the
other hand showed a decrease from 77.2 mg/l to 22.2 mg/l. This represents 71.2%
removal efficiency indicating that the most significant difference was in BOD re-
moval.
5.4.2 The BioMax ATUs Performance Characteristics
after Modification
Table 5.2
lists the mean results of influent and effluent qualities after modifica-
tion. During this experiment the aeration timer was set to operate intermittently for
12 hours per day for four weeks. The modification showed some amount of
changes in the effluent quality.
Table 5.2.
Influent and effluent qualities of the BioMax ATUs after modification of the
aeration regime
Parameters
Influent
(mean value)
Effluent
(mean value)
Removal
efficiency (%)
Nitrate-N
Ammonia-N
Phosphorus
Suspended solids
BOD
5
36.3 mg/l
8.5 mg/l
5.9 mg/l
39.2 mg/l
77.2 mg/l
18.7 mg/l
12.4 mg/l
3.6 mg/l
9.4 mg/l
12.6 mg/l
48.5
-
40.0
76.4
83.7
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