174
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Table 2 Rate kinetics of nitrate removal
Environmental condition
Rate of nitrate removal (h −1 ) R 2
Carbon source
Glucose
0.0143
0.9409
Starch
0.0526
0.9546
Cellulose
0.0079
0.9464
Sucrose
0.0064
0.9359
Acetic acid
0.0105
0.9220
Concentration of starch (%)
0.2
0.0576
0.8259
0.4
0.1209
0.8507
0.6
0.2140
0.8938
0.8
0.2928
0.9230
1.0
0.3789
0.9017
1.2
0.2317
0.7587
1.4
0.2237
0.6869
Temperature ( o C) + starch (1%)
25
0.0066
0.9325
30
0.0508
0.9929
35
0.0085
0.0965
40
0.0023
0.9343
45
0.0015
0.9311
pH + starch (1%) at 30 °C
6
0.0012
0.7432
7
0.0508
0.9929
8
0.0060
0.9201
9
0.0023
0.9890
Cell concentration (%) + pH 7 + starch (1%) at 30 °C
1
0.0459
0.9889
2
0.0483
0.9874
3
0.0523
0.9957
4
0.0576
0.9953
5
0.0609
0.9941
Table 3 Role of
environmental conditions on
nitrate removal
Factors
Mean rank χ 2
P
Starch
1.61
8.143 0.043 at 5%
significant level
Temperature
2.78
pH
2.78
Cell concentration 2.83