Food Microorganism FM ratio what volume to use 1

[blurt8]

Formula that I've seen is Flow x BOD/ Volume UNDER AERATION x Volatile Suspended Solids. A colleague says its actually total volume of all basins including anoxic. Which is right?

 

[bimr]

If you are using an anoxic tank for phosphorus removal, you should leave it out of the calculation.

The F/M ratio is a process control number that helps you to determine the proper number of microorganisms for your system. To do this calculation, you will need the following information:
Influent Flow into your activated sludge system (Flow MGD)
Influent CBOD (mg/l) concentration into your aeration tank.
Mixed Liquor Volatile Suspended Solids Concentration (mg/l) Volume (in gallons) of your aeration system

F= Influent Flow (MGD) X Influent CBOD Concentration (mg/l) X 8.34
M= Aeration System Volume (in Millions of Gallons) X MLVSS X 8.34

DEP Formula