JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III ENVIRONMENTAL ENGINEERING Previous Question Paper (May - 2018 - R15)

What is meant by population forecast?

Give the maximum acceptable limits of the following for the public drinking water (i) Turbidity (ii) Color (iii) Hardness; and (iv) pH.

Define ‘flowing through period’ and ‘detention period’ in a sedimentation basin.

Give the chemical reactions when ferrous sulphate is used as a coagulant with lime to remove turbidity.

Write a short note on Sewer and Sewage.

Write a short note on B.O.D and C.O.D.

Indicate the expected B.O.D removal in (i) Primary settling Tank (ii) Imhoff Tank.

Explain the principle of biological treatment in a waste water treatment plant.

Write in short principle of an aerobic sludge digestion.

What are the factors affecting sludge digestion?

Discuss the various points to be considered in the planning of a water supply scheme for a town or city.

Discuss the factors which affect the rate of water demand.

Enumerate the various surface sources of water, and discuss and compare the quality and quantity of water that may be available from these sources.

State the permissible limits for fluorides in water to be supplied for domestic consumption. Mention the ill-effects when they are not with in the permissible limits.

Explain sedimentation process used in a water treatment plant. Draw a neat sketch of a sedimentation tank in which a coagulant is used.

Distinguish between slow sand and rapid sand filters.

Design six slow sand filter beds from the following and show the arrangement of beds in plan: i) Population to be served = 50000 persons ii) Quantity of water to be supplied = 200 liters per head per day iii) Rate of filtration= 300 liters per square meter per day iv) Length of each bed is twice the breadth.

What is break point chlorination and under what conditions is it advocated?

Draw a neat diagram of a typical layout plan of a pumping station.

Explain water carriage system and conservancy system of sanitation. What are the salient features of each?

You are required to prepare a sewerage scheme for a town. Give briefly the outlines of the preliminary investigations you would make for preparing the project.

If for capita contribution of suspended solids and B.O.D. is 90 gm and 55 mg/lit find population equivalents of 40,000 liters daily of industrial waste water containing 1,800 mg/lit of suspended solids.

Distinguish between oxidation pond and oxidation ditch.

Who do you understand by primary process and secondary process of sewage treatment purification?

Compare and contract septic tank with Imhoff tank and clarigester in scope, function and performance.

An aeration tank on the diffused air system is to treatment 6.8 m.l.d of settled sewage having a B.O.D. of 10 mg/lit. find the (i) Volume of the aeration tank if the suspended solids content of the mixed liquor is 5500 mg/lit and the B.O.D. loading is to be 40 gm per 100 gm of suspended solids; (ii) Period of aeration of the return sludge occupies 25% of the aeration tank.

Describe the theory of activated sludge process. Give brief description of various types of activated sludge process.

Why is sludge an aerobically in a conventional sewage treatment plant?

Why is sludge digestion necessary?

What is sewage sludge? Explain with sketches the disposal of sludge by ‘Lagooning’.