GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Name: Wastewater Engineering
Time: 02:30 PM TO 05:30 PM Total Marks: 70
3. Figures to the right indicate full marks.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
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Subject Code: 2171306 Date:27/05/2019Subject Name: Wastewater Engineering
Time: 02:30 PM TO 05:30 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
| Q.1 | (a) Discuss in brief the classification of screen | 03 | ||||||||||||||
| (b) Write a short note: design of grease removal | 04 | |||||||||||||||
| (c) Discuss the operational problems of UASB reactor | 07 | |||||||||||||||
| Q.2 | (a) Enlist various approaches for the design of anaerobic digestors | 03 | ||||||||||||||
| (b) Discuss the design criteria for aerated grit chamber | 04 | |||||||||||||||
| (c) Discuss with the neat sketch of outline and inline equalization | 07 | |||||||||||||||
| OR | ||||||||||||||||
| (c) Determine the volume of equalization basin from the following data of time period vs. average flow during the time period where M = midnight | 07 | |||||||||||||||
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| Q.3 | (a) Discuss the operational problems of suspended growth process. | 03 | ||||||||||||||
| (b) Write a short note: high rate clarifier | 04 | |||||||||||||||
| (c) Write down the procedure for the design of WASB reactor | 07 | |||||||||||||||
| OR | ||||||||||||||||
| Q.3 | (a) Explain the operational problems of chemical unit processes | 03 | ||||||||||||||
| (b) Draw only a neat flow diagram of sludge drying beds | 04 | |||||||||||||||
| (c) Discuss the design of extended aeration | 07 | |||||||||||||||
| Q.4 | (a) Write down the equations used for the calculation of organic loading rate and sludge loading rate. | 03 | ||||||||||||||
| (b) Discuss the design criteria of rotating biological contactor (RBC). | 04 | |||||||||||||||
| (c) Design a suitable grit chamber to cater the need of a town having 0.2 million population with approximately 150 Litre per capita per day of sewage contribution. | 07 | |||||||||||||||
| OR | ||||||||||||||||
| Q.4 | (a) What can be done to prevent sludge bulking? | 03 | ||||||||||||||
| (b) Enlist the various sludge handling equipments used and discuss any one in brief | 04 | |||||||||||||||
| (c) Design a rotating biological contactor system for the flow of 5 MLD having BOD5 of 120 mg/L. The treated effluent should meet the discharge criteria of less than 30 mg/L of BOD5. Assume maximum permissible organic loading rate as 0.05 kg BOD5/m2.d | 07 | |||||||||||||||
| Q.5 | (a) Enlist various means thro’ which aeration can be provided to the effluent. | 03 | ||||||||||||||
| (b) Draw only a neat sketch of Biotower | 04 | |||||||||||||||
| (c) Design a bar screen for a peak flow of 50 MLD. | 07 | |||||||||||||||
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| Q.5 | (a) Write down the major equations used for the design of Biotower | 03 | ||||||||||||||
| (b) Discuss the step by step design of SBR | 04 | |||||||||||||||
| (c) Design a conventional activated sludge system having diffused aeration for the domestic wastewater having flow of 6300 m3/d, and having influent BOD5 as 220 mg/L. Assume the removal efficiency of 30% in primary treatment. | 07 | |||||||||||||||
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