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16/01/2022 6:54 pm
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The primary treatment of waste water involves the removal of
(a) Dissolved impurities
(b) Stable particles
(c) Toxic substances
(d) Harmful bacteria
1 Answer
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16/01/2022 6:55 pm
Correct answer: (b) Stable particles
Explanation:
10 treatment basically involves physical removal of particles from sewage through:
(i) Filtration and
(ii) Sedimentation
These are removed in stages:
(i) Initially floating debris is removed by sequential filtration.
(ii) Then the grit (soil and pebbles) are removed by sedimentation