Question

Given below is the flow chart of sewage treatment. Identify $A,B,C$ and $D$ and select the correct option

• A. $A$-Mechanical agitation; $B$ -Increased $BOD$
  $C$-Activated sludge; $D$-Aerobic sludge digesters
• B. $A$-Mechanical agitation; $B$-Reduced $BOD$
  $C$-Activated sludge; $D$- Anaerobic sludge digesters
• C. $A$-Microbial digestion; $B$- Activated sludge
  $C$-Reduced $BOD$; $D$-Anaerobic sludge digesters
• D. $A$-Microbial digestion; $B$-Mechanical agitation
  $C$-Reduced $BOD$ ; $D$-Aerobic sludge digesters

Answer 1

Answer: (B)

Correct answer is (b) $A$-Mechanical agitation; $B$-Reduced $BOD$
$C$-Activated sludge; $D$- Anaerobic sludge digesters