GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-V (NEW) EXAMINATION - WINTER 2020
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Subject Code:3153511 Date:27/01/2021
Subject Name:Waste Water Treatment- 11
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) A treatment unit is 1.5 m wide, 20 m long and has a wastewater depth of 2 m. If the wastewater flow through the tank is 0.5 m³/s, calculate the detention time. 03
(b) Explain the working of multi effect evaporator. 04
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(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 having 2 m width and 1.5 m depth. Determine the flow and flow through velocity. 03
(b) Explain Post chlorination and super chlorination in brief. 04
(c) Enlist at least 7 point of difference between rapid sand filter and slow sand filter. 07
Q.3 (a) Write a note on break point chlorination. 03
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(b) With a help of neat sketch. Explain in the line and off the line of flow type equalization tank. 04
(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 flow rate of 10 MLD. Calculate the detention time and surface loading rate of the clarifier having a wastewater depth of 2.5 m. 03
(b) What do you mean by break point chlorination? Explain in brief. 04
(c) Design oil and grease trap for following data: 07
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- Flow Q =50000 m3/day
- Detention time t = 5 mins
- Freeboard=0.3 m
Q.5 (a) Enlist different types membrane used for reverse osmosis. 03
(b) Explain different forms of chlorination in brief. 04
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(c) Define the following: 07
- WOR
- SOR
- Detention time
- Flow through velocity
- Settling Velocity
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Q.6 (a) Write Following equations to calculated head loss through screens. 03
- Krishmer equation
- Head loss through fine screens
- Head loss through partially clogged screens
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(b) What do you mean by sludge bulking? Explain in brief. 04
(c) Design a screen chamber for following data: 07
Flow Q =13 MLD
Approach Velocity V = 0.75 m/s
B:D=1.5:1
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Freeboard =0.3 m
Bar size = 50 mm x 10 mm
Width of opening = 25 mm
Quantity of screening = 0.0015 m³/ML of flow
Angle of inclination = 45
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Q.7 (a) Assuming the hydraulic loading rate of 25 m³/m²/day, determine the diameter and surface area of the basin treating 0.5 MLD flow of wastewater. 03
(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 for a wastewater flow rate of 10 MLD. 03
(b) Enlist different methods used for disinfection and explain any one in brief. 04
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(c) Explain advantages and disadvantages of reverse osmosis. 07
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