Question

Match the items in Column A with the items in Column B:

Column A	Column B
1. Tertiary treatment	(a) Mechanical process
2. Sewers	(b) Biological process
3. Waste water	(c) Scum
4. Secondary treatment	(d) Sewage
5. Primary treatment	(e) Pipes carrying sewage
	(f) Chemical process

Answer 1

Column A	Column B
1. Tertiary treatment	(f) Chemical process
2. Sewers	(e) Pipes carrying sewage
3. Waste water	(d) Sewage
4. Secondary treatment	(b) Biological process
5. Primary treatment	(a) Mechanical process