In the preliminary treatment of wastewater, skimming tanks are often included in the treatment scheme. Various features of skimming tanks are that these :1. can remove general floating matter.2. can remove oily and greasy matter.3. have detention time of 30 min.4. employ compressed air blown through diffusers.Which of these statements are correct ?

In the preliminary treatment of wastewater, skimming tanks are often i

1.	In the preliminary treatment of wastewater, skimming tanks are often included in the treatment scheme. Various features of skimming tanks are that these :1. can remove general floating matter.2. can remove oily and greasy matter.3. have detention time of 30 min.4. employ compressed air blown through diffusers.Which of these statements are correct ?
A.	1 and 3
B.	2 and 4
C.	2 and 3
D.	1 and 2
Answer» C. 2 and 3

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