Question

Which ONE of the following options is the CORRECT match of contaminants and their effluent treatment techniques?

• A. I – P; II – Q; III – R; IV – S
• B. I – Q; II – R; III – P; IV – S
• C. I – Q; II – S; III – P; IV – R
• D. I – R; II – S; III – Q; IV – P

Hint:

Suspended solids are best removed by filtration, while biodegradable organics are treated with biological systems like trickling filters. Heavy metals require ion exchange, and oil and grease are removed via flocculation.

Answer 1

The Correct Option is B

In this question, we need to match the contaminants with their most common effluent treatment techniques. Let's go through each option:
- Suspended solids (I): Suspended solids are best treated using filtration (Q), which physically removes solid particles from the liquid. Therefore, I – Q is correct.
- Biodegradable organics (II): Biodegradable organics are most commonly treated using trickling filters (R), where microorganisms degrade organic matter. Therefore, II – R is correct.
- Heavy metals (III): Heavy metals are typically removed using ion exchange (P), which uses a resin to replace metal ions with non-harmful ions. Therefore, III – P is correct.
- Suspended oil and grease (IV): Flocculation (S) is used to remove oil and grease by aggregating these particles into larger flocs, which can be easily removed. Therefore, IV – S is correct.
Thus, the correct matching is I – Q; II – R; III – P; IV – S. This corresponds to Option (B).