Q. In a primary sedimentation tank in percentage what is the amount of BOD removed?

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Q. What is the detention time considered while designing a primary sedimentation tank which is followed by a secondary treatment tank?

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Q. What is the detention time considered while designing a primary sedimentation tank which is followed by an activated sludge treatment tank?

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Q. What is the weir loading rate assumed while designing a primary sedimentation tank which comes prior to a secondary settling tank?

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Q. What is the range of width assumed while designing a rectangular tank?

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Q. While designing a rectangular primary sedimentation tank in what range the length should be assumed?

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Q. What is the range of diameter assumed while designing a circular tank?

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Q. What is the flight speed assumed while designing a circular tank?

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Q. What is the flight speed assumed while designing a rectangular tank?

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Q. Clarification removes most of the turbidity.

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Q. What is the first step in clarification?

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Q. The agglomeration of destabilized particles into large particles is called _________

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Q. What is the density of alum content used in water treatment?

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Q. What is the speed of the impeller in a flash mixer?

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Q. Microflocculation is brought about by which phenomenon?

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Q. Macro flocculation is brought about by which phenomenon?

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Q. Alum precipitation occurs at which pH?

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Q. Iron precipitation occurs at which pH?

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Q. Out of these which is not used as a chemical coagulant?

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Q. What is the one disadvantage of adding chemicals to bring about precipitation?

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