The Influence of Carbon Concentration on the Denitrification Rate

The effect of carbon concentration on the rate of denitrification has been explained with a Monod type of expression by, Stensel etal. (1973). Using methanol as the carbon source, the following expression was employed:

Ku+M

where:

M = methanol concentration, mg/l

Km = saturation constant for methanol, mg/l.

The kinetic value of KM is normally very low, normally in the order of 0,1 mg/l methanol.

Table 4.8 The influence of temperature on denitrification rate.

Process Carbon Source kf -1 Y

Suspended Methanol 0,05 1,12

separate culture

Suspended combined Raw sewage 0,06 1,15

culture

Suspended combined Endogenous 0,08 1,20

culture

Attached separate Methanol 0,02 1,05

culture

Attached culture - 0,03 1,07

Reference

10-25 Henze and Harremoes

Mulbager (1971)

15-25 Bernard (1975)

5-20 Harremoes and Rimer

18-29

Mechala etal. (1970)

Table 4.8 (continued)

Process

Carbon Source

°c

Y

Temp, range °C

Reference

Suspended

-

0,06

1,15

11-21

Hünerberg and Sarfert (1967)

Suspended

-

0,05

1,12

10-20

Mulbager (1971)

Suspended

-

0,05

1,12

10-20

Stensel (1971)

Suspended

-

0,05

1,12

5-27

Dawson and Murphy (1972)

Suspended

-

0,05

1,12

10-40

Ide et at. (1972)

Suspended

-

0,03

1,07

6-25

Murphy and Sutton (1974)

Attached

-

0,03

1,07

6-25

Murphy and Sutton (1974)

Suspended

-

0,04

1,10

5-25

Sutton et al. (1975)

Suspended

-

0,07

1,17

15-24

Parker etal. (1975)

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