BOD (biochemical oxygen demand) calculation

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Homework Statement

A seeded BOD test is to be conducted on meat-processing wastewater with an estimated strength of 800 mg/L. The seed is supernatant from aged, settled, domestic wastewater with BOD of about 150 mg/L. Calculate the BOD value for the industrial wastewater if the initial DO in both seed and sample bottles is 8.5 mg/L and the 5-day DOs are 4.5 mg/L and 3.5 mg/L for the seed test bottle and seeded waste water samples respectively.

Homework Equations

The Attempt at a Solution

BODt = [( DOi - DOf ) - ( Bi - Bf)(1-P) / P ]
Bi = initial DO concentration of seeded diluted water
Bf = final DO concentration of seeded diluted water
DOi = initial DO concentration of diluted sample
DOf = final DO concentration of diluted sample
P = Volume sample / total volume

I think the question can't be done , because the dilution factor (P) isn't given . Correct me if I am wrong ...[/B]

 

[dss975599]

Anyone has idea ?