# Download GTU B.Tech 2020 Summer 6th Sem 2160604 Water And Waste Water Engineering Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 6th Sem 2160604 Water And Waste Water Engineering Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? VI EXAMINATION ? SUMMER 2020
Subject Code: 2160604 Date:29/10/2020
Subject Name: WATER & WASTE WATER ENGINEERING
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS
Q.1 (a) How will you estimate Waste water discharge of your city?
03

(b) How will you select treatment train for a waste water treatment
04
plant giving you desired BOD and SS removal?

(c) Design flash mixer for flow of 270m3/hr
07

Q.2 (a) List out sewer appurtenances. Draw neat sketch of storm water relief
03
works.

(b) What are the objectives of aeration ? List out aerators.
04

(c) Derive equation of settling velocity
07

OR

(c) Derive shield's formula for self cleansing velocity.
07

Q.3 (a) Write design criteria for flocculator
03

(b) How will you determine optimum coagulant dose ?
04

(c) Explain procedure of determining storage capacity of reservoir.
07

OR

Q.3 (a) Give brief note on flexible joint
03

(b) Forecast population by means of geometrical increase method for
04
following data for year 2000 and 2010.
Year
1960
1970
1980
1990
Population 7000
11000
16000
22500

(c) A city with 1.5 lakh population is to be supplied water at 100lpcd
07
from a river 1 km away. The difference in water level of sump and
reservoir is 30 m. If the demand has to be supplied in 8 hours.
Determine the size of main and B.H.P. of pumps. Assume suitable
data
Q.4 (a) What is F/M ratio ?
03

(b) Define septic tank. Give the design criteria for a septic tank.
04

(c) What is HRTF? Determine the size of HRTF for flow of 4.50 MLD.
07
If recirculation ratio = 1.5, BOD of wastewater =250 mg/l and final
effluent desired = 30 mg/l. Assume suitable data if required.

OR

Q.4 (a) Discuss about sludge drying beds
03

(b) Describe steps of designing trickling filter
04

(c) Design a septic tank for a hostel building of 100 students Also design
07
the soil absorption system for the disposal of the septic tank effluent,
assuming the percolation rate as 20 minutes per cm. Also assume peak
discharge is 240 lpm
1

Q.5 (a) Why sludge recirculation is done in activated sludge process?
03

(b) How phosphorus removed by chemical precipitation ?
04

(c) Design a rectangular grit chamber for treating 5 MLD of sewage.
07

OR
Q.5 (a) Write note on pressure filter.
03
(b) List out different types of pipe with suitability of each.
04
(c) Design bell mouth canal intake for 11 MLD discharge.
07

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