The city of Turkey Run, IN operates an activated sludge aeration tank with the f

Question

The city of Turkey Run, IN operates an activated sludge aeration tank with the following dimensions: 7.0 m wide by 30.0 m long by 4.3 m effective liquid depth. The plan operating parameters as follows: Flow = 3, 400 m^3/d Soluble BOD_5 after primary settling = 0.13 kg/m^3 MLVSS = 1.5 kg/m^3 (MLVSS is the cell concentration in the aerator) Calculate the food to microorganism (F/M) ration (kg BOD_5 d^-1 kg MLVSS^-1), and the hydraulic retention time (hours) What activated sludge system is being used at Turkey Run, IN?

Explanation / Answer

Answer:
Food to microorganism ratio can be calculated by knowing the value of food and microorganisms such as follows;

For food(F) = Influent flow * BOD Concentration * 8.34

And for microorganisms(M) = Aeration system Volume * MLVSS * 8.34

Now finally, divide F by M to get ratio.

And hydraulic retention(Ht) time can be calculated by the following formula:

Ht = (Volume of aeration tank)/ Influent flowrate

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