Tertiary stage in sewage waste treatment involves the removal of ________

Pathogens

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Metals

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Solid Waste

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Harmful Chemicals

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Solution

The correct options are
A
Pathogens

B
Metals

D
Harmful Chemicals

Sewage treatment consists of 3 stages; Primary, Secondary and Tertiary. Primary treatment involves the removal of bulky solid wastes by sedimentation. Secondary treatment involves pumping of waster into oxidation ponds where organic matter is oxidised. In the tertiary stage harmful chemicals, metals, and pathogens are removed before being let out into water bodies.

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Column A	Column B
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Q. Here is crossword puzzle. Good luck!
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4. Solid waste extracted in sewage treatment
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(a)
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Across
3. Liquid waste products

(b)
4. Solid waste extracted in sewage treatment

(c)
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(d)
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(e)

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