Page 19 - SIMPLIFIED WASTEWATER TREATMENT FUNDAMENTALS_ Advanced Nitrification P1

Advanced Nitrification

It is important to note that nitrification can be inhibited in 2 ways.

1. An accumulation of Nitric Acid waste within the mixed liquor will

suppress or inhibit Nitrification.

2. High influent BOD can also inhibit Nitrification by altering the Food to

Mass ratio. Remembering that Nitrification requires a minimum F:M of

0.2, let’s look at an example of how higher BOD can affect F:M.

You can see that with increased influent BOD load, the higher amount of

food increased the F:M, exceeding the minimum 0.2 F:M target.

When slugs of high BOD concentration flow through a facility, the

immediate loss of Nitrite and Nitrate concentration can be measured and

tracked.