Download GTU B.Tech 2020 Winter 5th Sem 3153511 Waste Water Treatment Ii Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3153511 Waste Water Treatment Ii Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3153511 Date:27/01/2021
Subject Name:Waste Water Treatment- II
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.



MARKS
Q.1 (a) A treatment unit is 1.5 m wide, 20 m long and has a wastewater depth
03
of 2 m in it. It the wastewater flow through the tank is 0.5 m3/s, calculate
the detention time.

(b) Explain the working of multi effect evaporator.
04

(c) Enlist steps to determine the capacity of equalization tank.
07
Q.2 (a) A floating stick travels a distance of 15 m in 30 seconds in a reactor tank
03
having 2 m width and 1.5 m depth. Determine the flow and flow through
velocity.

(b) Explain Post chlorination and super chlorination in brief.
04

(c) Enlist at least 7 point of difference between rapid sand filter and slow
07
sand filter.
Q.3 (a) Write a note on break point chlorination.
03

(b) With a help of neat sketch. Explain in the line and off the line of flow
04
type equalization tank.

(c) Explain methods for neutralizing acidic waste in detail.
07




Q.4 (a) Assuming the diameter of the clarifier to be 20 m and the wastewater
03
flow rate of 10 MLD. Calculate the detention time and surface loading
rate of the clarifier having a wastewater depth of 2.5 m.

(b) What do you mean by break point chlorination? Explain in brief.
04

(c) Design oil and grease trap for following data:
07
1. Flow Q = 50000 m3/day
2. Detention time t = 5 mins
3. Free board = 0.3 m
Q.5 (a) Enlist different types membrane used for reverse osmosis.
03

(b) Explain different forms of chlorination in brief.
04

(c) Define the following:
07
1. WOR
2. SOR
3. Detention time
4. Flow through velocity
5. Settling Velocity



Q.6 (a) Write Following equations to calculated head loss through screens.
03
1. Krishmer equation
2. Head loss through fine screens
3. Head loss through partially clogged screens

(b) What do you mean by sludge bulking? Explain in brief.
04
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(c) Design a screen chamber module with following data:
07
1. Flow Q = 13 MLD
2. Approach Velocity Vh = 0.75 m/s
3. B:D = 1.5:1
4. Freeboard = 0.3 m
5. Bar size = 50 mm x 10 mm
6. Width of opening = 25 mm
7. Quantity of screening = 0.0015 m3/ML of flow
8. Angle of inclination = 45
Q.7 (a) Assuming the hydraulic loading rate of 25 m3/m2*day, determine the
03
diameter and surface area of the basin treating 0.5 MLD flow of
wastewater.

(b) Explain different tests used to estimate residual chlorine in water.
04

(c) With a help of near sketch explain the working of coagulation tank.
07



Q.8 (a) For a circular clarifier of 20 m diameter, determine the weir loading rate
03
for a wastewater flow rate of 10 MLD.
(b) Enlist different methods used for disinfection and explain any one in
04
brief.
(c) Explain advantages and disadvantages of reverse osmosis.
07


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