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111040 Pages:

What are the limitations of activated sludge process?

Write short notes on rotating biological contactors.

Compare a standard rate trickling filter with a high rate one.

A rectangular grit chamber is designed to remove particle with a diameter 0.2 mm
and specific gravity 2.65. The settling velocities of these particles are found to be
0.02 m/s. A flow through velocity of 0.30 m/s will be maintained by the
proportioning weir. Determine the channel dimensions for a maximum

wastewater flow of 10,000 m*/day.

PART C
Answer any two full questions, each carries 20 marks.
Design an imhoff tank to treat the sewage from a small town with a population of

20000 persons ,with sewage flow rate of 180 litres per day

What are the advantages and disadvantages of oxidation ponds?

What are the features of acid regression stage and alkaline fermentation stage of
sludge digestion?

Explain the working of an Up flow Anaerobic Sludge Blanket (UASB) reactor.
Discuss any three drawbacks of UASB.

What are the methods of sludge disposal.
Explain sludge drying bed?

What are the various factors affecting sludge digestion?

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