Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
Correct answer: B. In sedimentation tanks equipped with mechanical scrapper
- A. By chemical coagulation
- B. In sedimentation tanks equipped with mechanical scrapper
- C. In vacuum filter
- D. In clarifiers
Explanation
Wastewater containing about 3% clay, slate and stone is handled by gravity settling in tanks fitted with mechanical scrapers to remove the deposited solids. Clarifiers also settle solids in general, but the scraper-equipped sedimentation tank is the specific treatment described.
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