Formation of sludge takes place during __________ treatment in an effluent treatment plant.

quaternary

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primary

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tertiary

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secondary

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Solution

The correct option is D
secondary

Formation of sludge takes place during secondary treatment in an effluent treatment plant. The waste water is pumped into oxidation ponds where microorganisms oxidize the organic matter releasing carbon dioxide, and a solid precipitated material sludge is produced that can be used as manure.

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