# Dr. A.P.J. Abdul Kalam University BE VI SEM (CE) Water Supply & Waste Water Engineering-II [CE-601] June 2021 Question Paper

Dr. A.P.J. Abdul Kalam University

Bachelor of Engineering

Sixth Semester Examination, June-2021

Water Supply & Waste Water Engineering-II [CE-601]

Branch-Civil

Time: 3:00 Hrs Max Marks 70

Note: (i) Attempt any five questions. All question carry equal marks.

(ii) Assume suitable data necessary and state them clearly.

Q.1 (a) Discuss the comparative merits and demerits of the separate

system and combined system of sewerage

(b) What are the various methods of cleaning of sewer? Describe in

brief?

Q.2 (a) Explain any two rural water supply schemes?

(b) What do you understand by the term “Self cleansing velocity in

sewers”?

Q.3 (a) Define a) Filtration b) Disinfection c) Aeration d) Water softening

(b) If 5 day 20° Celsius is 225mg/litre, what would be its 8 day BOD

at 15° Celsius temperature? Assume de-oxygenation coefficient, Kd=

0.15 at 20° Celsius?

Q.4 (a) What is land treatment? Discuss the conditions under which it is

suitable?

(b) Describe the Aerobic and Anaerobic cycles taking parts in

stabilisation of organic matter in nature

Q.5 (a)What do you understand by Grit chambers? Write the various

design parameters with its neat sketch?

(b) What do you understand by Type I, Type II, Type III, Type IV

sedimentation? Explain clearly?

Q.6 Design the parabolic section of a Grit chamber for the following data :

Maximum flow; 50000m 3/day Minimum flow; 12000m 3/day Average flow; 30000m3/day

Horizontal Velocity; 0.25m/sec

Q.7 (a) What do you understand by the efficiency of Trickling filter?

(b) Discuss in brief various design parameters used for settling tank

Q.8 (a) Explain in brief various methods used for Aeration in the activated

sludge process?

(b) Design the dimensions of a septic tank for a small colony of 200

persons provided with an assured water supply from water works at a

rate of 135 litre/capita/day

Assume: i) 85% water converted into sewage

ii) Rate of sludge deposition – 30litres/capita/year

iii) The period of cleaning – 2 years

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