The population dynamics of the denitrifying bacteria resemble the dynamics proposed for the nitrification bacteria, but the growth rate for the denitrifying bacteria is larger than for the nitrifying bacteria. It is, therefore not difficult for the denitrifying bacteria to compete with oxidizing bacteria in a combined organic and nitrogen removal, as is the case for the nitrifying bacteria.
The safety factor SF concept used in Section 3.12 can also be applied to denitrification. It can be related to nitrate removal rates through the following equation:
<(>d = solids retention time for the denitrification process
<|>m = minimum solids retention time for the denitrification process
In the case of denitrification, the safety factor can be related to nitrate removal rates, using the following two equations:
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