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Q: The alum added as coagulant in water treatment functions better when the raw water is:
  • A. Acidic with high turbidity.
  • B. Alkaline with high turbidity
  • C. Neutral with low turbidity.
  • D. Acidic with low turbidity.
Correct Answer: Option B - When the raw water has high turbidity and is alkaline in nature then the alum added will functions better. Alum works in pH range of 6.5 to 8.5. It introduces permanent hardness in water.
B. When the raw water has high turbidity and is alkaline in nature then the alum added will functions better. Alum works in pH range of 6.5 to 8.5. It introduces permanent hardness in water.

Explanations:

When the raw water has high turbidity and is alkaline in nature then the alum added will functions better. Alum works in pH range of 6.5 to 8.5. It introduces permanent hardness in water.