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000 0 05121902

A circular sedimentation tank (bottom slope of 1V:12H) fitted with standard
sludge removal equipment is to handle 3.6 MLD of water? If the detention period
of the tank is 5 hours and the depth of the tank is 3m, what should be the diameter
of the tank?

Write a note on any three operation troubles in filters.

Design the principal components of a Rapid sand filter including manifold and
under drainage system for treating 4 MLD of water?
Compare alum and iron salts as coagulant.
PART C
Answer any two full questions, each carries 20 marks.
Enlist and explain the different layout of distribution networks with their merits

and demerits ?
Explain Hardy-Cross method of analysis of complex pipe networks?

Differentiate fluoridation and defluoridation process. Give an example for each
case.
Explain Equivalent pipe method of water distribution network analysis.

List out common methods of disinfection usually employed in water treatment.
Determine the annual requirement of bleaching powder to treat 6MLD of water
which requires 0.3ppm of chlorine. The available chlorine in bleaching powder
was found to be 25% only.

What are the requirements of a good water distribution system?

Enlist any four factors affecting the efficiency of chlorination. Calculate the
dosage of chlorine in mg/l and the chlorine demand of water if chlorine usage in
the treatment of 20,000m* of water per day is 10 kg/day. A residual chlorine after
10 minutes of contact is to be maintained at 0.2 mg/l.

Enlist various pipe appurtenances in a water distribution network and with neat
sketches explain any two of them.

Discuss demineralisation process and electro dialysis in water treatment.

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