The dilution factor d for an unseeded mixture of wastewater is 0.05. the do of the mixture is initially 8.0 mg/l, and after 5 days it has dropped to 2.0 mg/l. the reaction rate constant k has been found to be 0.20 day? (i) what is the 5-day bod of the waste? (ii) what would be the ultimate carbonaceous bod?

(i) 5-day BOD of the waste is 120 mg/l.

(ii) The ultimate carbonaceous BOD (Lo) is 20 mg/l.

Explanation:

The dilution factor D is 0.05.

The initial DO is 8.0 mg/L and the DO after 5 days is 2.0 mg/L.

The BOD of the waste for an unseeded mixture is

The ultimate carbonaceous BOD (Lo) can be calculated as

2b2t

explanation:

2b2t

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