Environmental Engineering Quality and Characteristics of Sewage

In a BOD test, initial DO of the 2% diluted sample is 6 mg/lit and its DO after 5 day incubation at 20°C is 4 mg/lit. The 5 day BOD of sewage sample is:

1

100 mg/lit

2

130 mg/lit

3

80 mg/lit

4

150 mg/lit

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