The excessive acidity or alkalinity of the particular wastewater is neutralized by adding alkali or acid and this is achieved in
- Athe sedimentation tank
- Bthe equalization tankCorrect
- Cthe flocculation tank
- Dthe purification tank
Solution
Concept
Neutralization of industrial wastewater
Step-by-step solution
1. Industrial wastes with strong acidity or alkalinity are neutralised before further treatment. 2. This is done in an equalization (or neutralization) tank, where flows and pH are balanced.
Explanation
The equalization tank evens out variations in flow and composition and is where acid or alkali is added to correct the pH.
Why the other options are wrong
Sedimentation tanks remove settleable solids, flocculation tanks promote coagulation, and "purification tank" is not a standard unit.
Shortcut
Equalization/neutralization tank adjusts pH.
Common mistake
Choosing the flocculation tank.
Correct answer: B) the equalization tank