Atest bottle containing just seeded dilution water has its do level drop by 0.8 mg/l in a 5-day test. a 300 ml bod bottle filled with 30 ml of wastewater and the rest with seeded dilution water experiences a drop of 7.3 mg/l in the same period (5-day). calculate the bod5 of the wastewater.

BOD_5 = =65.8 mg/l

Explanation:

dilution water DO level = 0.8 m/l

BOD level drop to 7.3 mg/l

we know that BOD at 5th day can be clculated by using following relation

- DO drop in BOD bottle

- dilution water drop

P= 30/300 = 0.1

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