390
D. Raha et al.
y = 21.05x + 0.069
R² = 0.968
0.0
1.0
2.0
3.0
4.0
0.00
0.05
0.10
0.15
1/U
C (mg MLSS. day/ mg SCOD)
1/C [1/(mg /L of SCOD)]
Fig. 6 Substrate utilization kinetics for batch carbon oxidation [SCOD = 1250 ± 50 mg/L]
0.0
1.0
2.0
3.0
4.0
5.0
0.00
0.50
1.00
1.50
2.00
2.50
1/ ( Per day)
U C (mg SCOD / mg MLSS. day)
y=0.509x-0.028
R
2
=0.980
θ
Fig. 7 Microbial growth kinetics for batch carbon oxidation [SCOD = 1250 ± 50 mg/L]
nitrification was found to be 0.273 mg of MLSS/mg of NH 4
+ –N and 0.052 per day,
respectively as shown in Fig. 9.
3.3.3 Kinetics for Denitrification
The experimental value of (1/U DN ), the reciprocal of NO 3
− –N utilization rate were
plotted against (1/N
), reciprocal of NO 3
− –N by using equation 1/U DN = (K s /k)(1/N
)
+ 1/k as shown in Fig. 10. The values of 1/θ were also plotted against U DN as shown
in Fig. 11. The values of k, Y and k d were found to be 0.937 per day, Y0.898 mg
MLSS/mg NO 3
− –N and 0.071 per day, respectively, for denitrification kinetics.
D. Raha et al.
y = 21.05x + 0.069
R² = 0.968
0.0
1.0
2.0
3.0
4.0
0.00
0.05
0.10
0.15
1/U
C (mg MLSS. day/ mg SCOD)
1/C [1/(mg /L of SCOD)]
Fig. 6 Substrate utilization kinetics for batch carbon oxidation [SCOD = 1250 ± 50 mg/L]
0.0
1.0
2.0
3.0
4.0
5.0
0.00
0.50
1.00
1.50
2.00
2.50
1/ ( Per day)
U C (mg SCOD / mg MLSS. day)
y=0.509x-0.028
R
2
=0.980
θ
Fig. 7 Microbial growth kinetics for batch carbon oxidation [SCOD = 1250 ± 50 mg/L]
nitrification was found to be 0.273 mg of MLSS/mg of NH 4
+ –N and 0.052 per day,
respectively as shown in Fig. 9.
3.3.3 Kinetics for Denitrification
The experimental value of (1/U DN ), the reciprocal of NO 3
− –N utilization rate were
plotted against (1/N
), reciprocal of NO 3
− –N by using equation 1/U DN = (K s /k)(1/N
)
+ 1/k as shown in Fig. 10. The values of 1/θ were also plotted against U DN as shown
in Fig. 11. The values of k, Y and k d were found to be 0.937 per day, Y0.898 mg
MLSS/mg NO 3
− –N and 0.071 per day, respectively, for denitrification kinetics.