Subject Code: 2183507
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019Subject Name: Design of Treatment Plants
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1
(a) Differentiate unit operations & unit process. Quote one example of each. (03 Marks)
(b) Explain impacts of improper storm water management. (04 Marks)
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(c) Determine terminal settling of a sand particle with an average diameter of 0.5mm and density of 2600 kg/m³ settling in water at 20°C. (viscosity = 1.01 * 10?³ Ns/m²) (07 Marks)
Q.2
(a) Define Sedimentation. Also explain the following terms. (04 Marks)
- Discrete Settling
- Flocculent Settling
- Zone Settling
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(b) Explain treatability study of activated sludge process. (07 Marks)
(c) Using Rankin’s method and assuming suitable design criteria, design a high rate trickling filter to treat 10 MLD flow of domestic waste water having settled BOD of 200 mg/l. (07 Marks)
Design Criteria & Assumptions:
- Concentration of desired effluent BOD = 30 mg/l
- Depth of filter media = 2 m
- Applied BOD to the filter is settled BOD
- Assume organic loading as 1 kg BOD/ d.m³ volume of filter
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OR
(c) Using the Velz equation; determine the filter depth of a low rate trickling filter, if settled ultimate BOD is 100 mg/L and desired BOD5 is 20 mg/L. (Let’s assume BOD5 = 68% of Ultimate BOD, Removable effluent BOD = 95% and k=0.18) find C, Cnr, CD and D. (07 Marks)
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Q.3
(a) With the help of a neat sketch explain working of UASBR. (03 Marks)
(b) Explain working of clarifier with its neat sketch. (04 Marks)
(c) A water treatment plant has a flow rate of 0.6 m³/sec. The settling basin at the plant has an effective settling volume that is 20 m long, 3 m tall and 6 m wide. Will particles that have a settling velocity of 0.004 m/sec be completely removed? If not, what percent of the particles will be removed? How big would the basin need to be to remove 100% of the particles that have a settling velocity of 0.004 m/sec? (07 Marks)
OR
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(a) Explain treatment plant of surface water with its neat sketch. (03 Marks)
(b) Write a diagram for scale up. (04 Marks)
(c) Design a PST to treat domestic wastewater with flow of 250 LPCD of a town having 5 lakh populations. (07 Marks)
Date: 15/05/2019
Total Marks: 70
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Q.4
(a) Explain membrane system in cleaner production. (03 Marks)
(b) Draw a water quality diagram for DO sag curve. (04 Marks)
(c) Assume flowing design criteria for DAF thickener to increase the conc. of activated sludge solid from 0.25 - 4.5%. (07 Marks)
SLR = 10 m/day
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Sludge flow rate = 450 m³/dOperating temperature = 30 degree Celsius
Air solubility S’a = 15.7 ml/l
A/S = 0.02 ml/mg
Recycled system pressure, P = 300 kpascal
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OR
(a) Explain different screens with their mesh size. (03 Marks)
(b) Explain onsite treatment process for pharma sector. (04 Marks)
(c) Narrate any two example of ZLD in chemical industry. (07 Marks)
Q.5
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(a) Explain data analysis for waste water characteristics. (03 Marks)
(b) Write a note on secondary settling tank. (04 Marks)
(c) Write a note on multi-effect evaporator. (07 Marks)
OR
(a) What is a working of grit chamber? (03 Marks)
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(b) Write a note on trickling filter. (04 Marks)
(c) On which mechanism neutralization and equalization tank works? What is a difference and similarities between them? (07 Marks)
Assumptions:
- WW generation = 80% of water consumption
- S.S. in water = 250 mg/l
- BOD5 20°c of WW = 200 mg/l
- SLR = 40 m³/m²+d(daily of avg. flow) = 100 m³/m²+d(daily of peak flow)
- Detention time — 2 hr
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