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G192055 Pages:2

Find the diameter of the particles with specific gravity 1.2 removed in a tank
having a surface area of 250 ന” treating 101,110 of water at 219८.

Design a slow sand filter from following data.

Population to be served = 50,000 persons
Per capita demand = 150 Lped

Rate of filtration = 180 L/hr./sq.m
Length of each bed = Twice the breadth

Assume maximum demand as 1.8 times the average daily demand. Also
assume that one out of six will be kept as stand by.

Design a clariflocculator to treat 6 MLd of water. Assume suitable data whereever
necessary.

Name any four commonly used coagulant in water treatment. What are the
factors which affect coagulant dosage.
With the help of a neat sketch explain the construction, working and back
washing of a rapid sand filter.
PART C
Answer any two full questions, each carries 20 marks.

Define disinfection. Enlist various methods of disinfection and mention where
they are suitable.
Explain various types of chlorination in water treatment ?

Explain analysis of a water distribution system using Hardy Cross method.
Discuss the purpose and methods of aeration in water treatment.

Explain any three common methods employed in desalination of water.

Explain equivalent pipe method in water distribution network design.

Name the various types of water distribution systems .

Determine the distribution of flow in the pipe network shown in figure. The head

loss ht, may be assumed as KQ’. The flow is turbulent and pipes are rough. The

value of k for each pipe is indicated in the figure. Use Hardy-Cross method.
50

50

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