Equation (4.12) is shown since if any oxygen is present, it will be used preferentially before the denitrification.
The theoretical methanol requirement for nitrate reduction, neglecting synthesis is 1,9 mg methanol per mg nitrate-N (4.1). Including synthesis (equation 4.10) the requirement is increased to 2,47 mg.
Similarly, calculation of methanol requirements for nitrite reduction and deoxygenation allows a combined expression to be formulated for the methanol requirement.
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