Effluent discharges from two secondary clarifiers were sampled. The secondary clarifier “A” is operated with the synthet

[answerhappygod]

Effluent discharges from two secondary clarifiers were sampled.
The secondary clarifier “A” is operated with the synthetic media
trickling filter tank while secondary clarifier “B” is operated
with the rock media trickling filter tank, respectively.
-A 10 mL sample volume of “A” secondary clarifier is placed into
a BOD bottle with 290 mL of dilution water. The DO initial is
measured to be 12.5 mg/L, and the DO final is measured to be 8.1
mg/L.
-A 10 mL sample volume of “B” secondary clarifier is placed into
a BOD bottle with 290 mL of dilution water. The DO initial is
measured to be 14.5 mg/L, and the DO final is measured to be 11.5
mg/L.
a) Calculate the BOD5 concentrations for the secondary clarifier
“A” and “B”, respectively