Discussion
Match the following :
| Waste Separation Techniques | Pollutants Separated |
|---|---|
| (a) Stripping | (i) Toxic metals |
| (b) Precipitation | (ii) Oils and organochlorine compounds |
| (c) Sorption | (iii) Ethanol |
| (d) Solvent extraction | (iv) Xylene |
Answer: B
The correct matching is a-iii, b-i, c-iv, d-ii.
- (a) Stripping removes volatile compounds by passing air or steam through the waste: ethanol.
- (b) Precipitation converts dissolved toxic metals into insoluble hydroxides or sulphides that settle out.
- (c) Sorption on activated carbon removes dissolved organic solvents such as xylene.
- (d) Solvent extraction transfers oils and organochlorine compounds into an immiscible solvent.
The fastest check is precipitation, the standard method for heavy metals: only option B pairs precipitation with toxic metals. Option A pairs precipitation with oils, option C with ethanol and option D with xylene, none of which is removed by precipitation.
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