SSC JE Civil Engineering 23-Mar-2021 Shift 2 Paper

Question : 166 of 200

Marks: +1, -0

The following data pertains to a sewage sample at a point source.
Initial dissolved oxygen (DO) = 12 mg/I; Final DO = 4 mg/I; Dilution of sewage was done to 2% .
The Bio-chemical oxygen demand (BOD) of the given sample of sewage is:

800 mg/l
80 mg/l
8 mg/l
400 mg/l

Validate

Solution:

Initial DO = 12 mg/lFinal DO = 4 mg/l
2 % Dilution sample ⇒ Dilution factor

= 100/2

BOD = (Initial BOD−Final BOD) × Dilution Factor

{\BOD} =(12-4) × {100}/{2}

= 400 mg/l

Go to Question:

Prev Question

Next Question