Biomedical Engineering Reference
In-Depth Information
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
Dentrifying
groundwater
Strain KC
6.5
7
7.5
8
8.5
9
pH
Figure 9.8. Maximum specific growth rates for P. stutzeri KC versus native microflora in School-
craft, Michigan aquifer groundwater (from Sneathen,
1996
).
Table 9.2. Kinetic Parameters for Nitrate Conversion to Nitrite and for Nitrite Conversion to
Nitrogen for P. stutzeri KC and Denitrifying Microflora Native to the Schoolcraft, Michigan Aquifer
(adapted from Knoll,
1994
)
a
.
Cultures Grown at pH 8.2
Strain KC
Schoolcraft Site Microflora
NO
3
to NO
2
m
max
, maximum specific growth rate, d
1
3.1 0.7
0.8 0.2
q
max
maximum specific rate of acetate
utilization, mg acetate/mg vss-d
6.3
1.4
7.8
2.0
Observed yield, mg vss/mg acetate
0.5 0.1
0.1 0.0
Moles nitrate consumed per mole
acetate consumed
2.7
0.5
1.6
0.2
Moles nitrite produced per mole NO
3
consumed
1.0 + 0.0
0.6 0.1
NO
2
to N
2
O and/or N
2
m
max
, maximum specific growth rate, d
1
0.2 0.1
0.7 0.1
q
max
, maximum specific rate of acetate
utilization, mg acetate/mg cell dry
weight-d
0.5 0.2
3.3 0.4
Observed yield, mg vss/mg acetate
0.4
0.0
0.2
0.1
Moles nitrite consumed per mole
acetate consumed
1.4 0.2
2.2 1.0
Overall
Observed yield, mg vss per mg acetate
0.41 0.16
0.14 0.06
Moles nitrate removed per mole acetate
consumed
1.9 0.2
1.8 0.3
a
Volatile suspended solids (vss) are assumed to be 90% of the dry cell mass. All cultures were grown at pH 8.2 and
T
ΒΌ
21 degrees Celsius (
C)
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