Microbes In Human Welfare Question 8
Question: Passage of effluents into oxidation tank is for:
Options:
A) Primary treatment
B) Secondary treatment
C) Tertiary treatment
D) Both [a] and [b]
Show Answer
Answer:
Correct Answer: B
Solution:
Effluent is passed to oxidation tank for secondary treatment.
The secondary treatment involves:
Effluent is passed to
aeration tank → Constant agitation → Air pumped → Vigorous growth of bacteria → Floc formation → Consumption of organic matter by bacteria → Decrease in BOD
BOD is the amount of oxygen required by bacteria to oxidise all the organic matter present in the effluent.
Naturally, if organic matter decreases → BOD decreases → Pollution decreases.
BETA
