Download GTU BE/B.Tech 2019 Winter 5th Sem New 2151303 Physico Chemical Treatment Technologies Question Paper

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Subject Code: 2151303

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. (a) Why are screens necessary before the treatment of wastewater? [03]
   

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   (b) Write a short note on grit removal mechanism. [04]
   (c) Derive the Stokes law for settling velocity of discrete particles. [07]
2. (a) Define : (1) SOR (2) WOR (3) Scour velocity [03]
   (b) Differentiate between unit process and unit operations. [04]
   (c) Write a Short note with a neat sketch on “Horizontal flow Grit Chamber”. [07]
   

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   OR
   (c) Write a short note on “Breakpoint chlorination”. [07]
3. (a) Explain the terms along with their values for RSF (i) Uniformity coefficient (11) Effective size [03]
   (b) Differentiate between Physical treatment & Chemical treatment for waste water. [04]
   (c) Enlist the different types of mixing equipments & explain any one with sketch. [07]
   

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   OR
   (c) Differentiate between: Coagulation and Flocculation [07]
4. (a) Explain various physical and chemical characteristics of water and waste-water. [03]
   (b) Explain the procedure for statistical analysis of waste water flow rate data. [04]
   (c) Enlist the factors which affect chlorination. [07]

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5. (a) Differentiate between discrete and flocculent settling. [03]
   (b) Explain the mechanisms of filtration. [04]
   (c) List down the various methods used for particle destabilization. [07]
   OR
   (c) Write a short note on ‘Tube Settlers’ [07]

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6. (a) Explain with neat sketch: dissolved air flotation for surface water treatment. [03]
   (b) Prepare a list of disinfectants and explain any one in brief. [04]
   (c) Write down the sources and effects of the following parameters in water (1) Organic matter (i1) Turbidity [07]
7. (a) Explain Sludge Drying bed and its design criteria. [03]
   (b) Enlist and explain the mechanisms by which the colloids are stabilized. [04]
   

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   (c) Explain the term “Zeta Potential” with neat sketch. [07]
   OR
   (c) Explain aerobic and anaerobic sludge digestion. [07]