Match List I (Water treatment) with List II (Process) and choose the correct answer from the options given below.
List I
i.Primary
ii.Secondary
iii.Tertiary
iv.Advanced
List II
a.Removal of wastes with the help of activated charcoal etc.
b.Ozonization and disinfection by ultraviolet rays
c.Removal of large pieces such as sticks, stones, rags, plastic etc.
d.Removal after flocculation and coagulation of wastes
Ai-a, ii-b, iii-c, iv-d
Bi-c, ii-d, iii-a, iv-b ✓ Correct
Ci-b, ii-c, iii-a, iv-d
Di-d, ii-a, iii-b, iv-c
Correct answer: (B) i-c, ii-d, iii-a, iv-b
Explanation
Primary treatment removes large solids like sticks and stones, secondary uses flocculation and coagulation, tertiary uses activated charcoal, and advanced uses ozonization and ultraviolet rays.
Primary treatment screens out the coarse debris such as sticks, stones, rags and plastic.
Secondary treatment removes finer suspended matter after flocculation and coagulation.
Tertiary treatment polishes the water further using activated charcoal and similar media.
Advanced treatment disinfects with ozonization and ultraviolet rays.
Each successive stage improves water quality until it is fit for its intended reuse or discharge.
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