Discussion
In a waste water treatment plant, the removal of setteleable solid and floating matter is done in a :
Answer: A
Settleable solids and floating matter are removed in primary classifiers (primary clarifiers).
In the primary sedimentation tank, sewage flows slowly enough for settleable organic solids to sink as primary sludge, while grease, oil and other floating matter rise and are skimmed off as scum. It typically removes about 50-70% of suspended solids and a quarter to a third of the BOD.
The bar screen comes first and catches large objects such as rags and plastics. The grit chamber removes heavy inorganic grit and sand, not organic settleable solids. An equalization tank evens out variations in flow and strength; it does not separate solids.
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