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Question
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal
Options:
A .  by chemical coagulation.
B .  in sedimentation tanks equipped with mechanical scrapper.
C .  in vacuum filter.
D .  in clarifiers.
Answer: Option B
Answer: (b).in sedimentation tanks equipped with mechanical scrapper.

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