Question

Select the option regarding the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) that have been arranged in ascending order?

• A. SE<PE<S<DE
• B. S<PE<SE<DE
• C. S<DE<PE<SE
• D. SE<S<PE<DE..

Answer 1

Answer: (B)

The more the value of BOD of the water sample the more will be the pollution by organic matter. BOD of distillery effluent will be approximately 40000 mg/L, sugar mill effluent BOD value will be around 3480mg/L and that of paper mill effluent and sewage is 190 mg/L and 30 mg/L respectively.