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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Q. When alum is added to the waste water containing calcium ions which compound is formed as a precipitate?

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Q. Along with ferrous sulphate what other chemical is added in order to bring about precipitation?

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Q. Why is Ferric ammonium sulfate generally not used as a coagulant?

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Q. What is the recommended surface loading rate in case of alum floc suspension?

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Q. In percentage what is the amount of TSS removed by chemical clarification?

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Q. In percentage what is the amount of BOD removed by chemical clarification?

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Q. In percentage, how much does the chemical sludge contribute to the total sludge formed?

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Q. Assume in a sample of waste water around 60% TSS is removed by primary sedimentation without chemical addition. Calculate the mass of TSS removed for the following data.

Amount of TSS present initially: 220 mg/L
Waste water flow: 1000 m³/d

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