GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020
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Subject Code:2171306Date:30/01/2021
Subject Name: Wastewater Engineering
Time:10:30 AM TO 12:30 PM
Total Marks: 47
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Instructions:
- Attempt any THREE questions from Q.1 to Q.6.
- Q.7 is compulsory.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 Differentiate between domestic wastewater and industrial wastewater. MARKS 03
Q.2 Design an aerated grit chamber for the treatment of Municipal waste water. The average flow rate is 0.60 m3/s and the peaking factor is 2.25. MARKS 04
Q.3 Design a bar rack (mechanically cleaned) for an average flow 40 MLD flow condition in incoming sewer is given by: MARKS 07
a. Diameter of sewer = 1.53 m
b. Depth of flow at peak flow =1 m
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c. Velocity at peak design flow = 0.8m/s
d. Drop to screen chamber flow with respect to sewer invert is 0.08
e. Peaking Factor = 2
Q.4 Explain the concept of flocculation and the different types of flocculators. MARKS 03
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Q.5 Design an oil and grease trap to remove 180 mg/L of oil and grease from a flow of 43000 m³/day of wastewater. MARKS 04
Q.6 For the flow rate data given in the table below, find out the volume of equalization tank. MARKS 07
| Time | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Q,m³/h | 90 | 116 | 225 | 231 | 249 | 310 | 640 | 750 | 830 | 825 | 720 | 700 |
| Time | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| Q,m³/h | 650 | 570 | 450 | 320 | 230 | 225 | 210 | 194 | 165 | 135 | 105 | 60 |
Q.1 Enlist various methane precursors in anaerobic decomposition. MARKS 03
Q.2 Explain volumetric organic loading, upflow velocity and gas collection system. MARKS 04
Q.3 Explain the UASB process with its design criteria. MARKS 07
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Q.4 What is Bio tower? Explain its working. MARKS 03
Q.5 Explain the purpose of following unit operations/processes in a wastewater treatment plant: (i) Grit Chamber, (i1) Attached growth biological process (iii) Secondary Sedimentation and (iv) Nitrification MARKS 04
Q.6 Design a rotating biological contactor to treat a flow of 50 MLD flow of primary treated wastewater having BOD5 of 200 mg/L. Desired effluent BOD5 is 30 mg/L. MARKS 07
Q.1 Explain the factors responsible for foaming in ASP. MARKS 03
Q.2 Enlist and Explain the operational problems of chemical unit operations. MARKS 04
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Q.3 Explain the phases of SBR operational cycle with neat sketch. MARKS 03
Q.4 Write a short note on rotating biological contactors. MARKS 04
Q.5 Differentiate between standard rate and high rate anaerobic digesters. MARKS 07
Q.7 (b) Design a conventional activated sludge plant at 0.3 F/M ratio to obtain 85% BOD removal efficiency, estimate the net surplus sludge produced per day. Assume suitable reaction constants. MARKS 07
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Q.7 (a) Differentiate between extended aeration and tapered aeration. MARKS 05
OR
Q.7 (a) Explain various methods of thickening of sludge. MARKS 05
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