TM 5-814-3/AFM 88-11, Volume III
c. Separate-stage nitrification. Separate-stage nitrification simply separates the nitrification process from
the activated sludge process. A typical system is illustrated in figure 15-3. The main advantage to this system
is that it allows individual optimization of the activated sludge and nitrification processes in terms of hydraulic
and organic loadings. The relationship between ammonia removal rate and mixed liquor, volatile suspended
solids concentration is shown in figure 15-4. There is little sludge waste in the separate nitrification system
and total sludge recycle is to be used. Detention time will be from 3 to 5 hours, based on influent flow with
clarifier overflow rates between 500 and 800 gallons per day per square foot. Diffused air will be supplied
at approximately 1 standard cubic foot per minute per gallon of wastewater treated.
15-20
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