Oxygen transfer rate in Wastewater treatment - calculation example

Oxygen transfer rate in Wastewater treatment - calculation example

Before we can calculate the oxygen transfer rate, we have to determine our oxygen demand. Depending on the wastewater treatment target different factors must be considered to calculate the actual oxygen requirement (AOR). 1. Design flows and loads: Water influents are not consistent and vary between daily minimum, average and peak flows. Design guidelines recommend dividing the average day of the peak month by 24 hours to calculate the needed aeration amount. 2. BOD load: The amount of oxygen needed for microorganisms to decompose organic material is about 0.9 to 1.3 lb O2 per lb BOD. 3. Total Nitrogen reduction: Nitrifying bacteria oxidizes ammonium (NH4+) first to Nitrite (No2-) and then to Nitrate (No3-). For this process the bacteria need about 4.6lb of O2 per pound of ammonium...

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