Download GTU BE/B.Tech 2018 Winter 6th Sem New 2161304 Biological Processes For Wastewater Treatment Question Paper

GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VI (NEW) EXAMINATION - WINTER 2018
Subject Code:2161304 Date:20/11/2018

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Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.

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1. (a) What do you mean by ThOD? Determine the ThOD of Glucose. [03]
   (b) Write down the difference between Biological and Physico-chemical analysis. [04]
   (c) Draw the BOD progressive curve & explain different phases of the same. [07]
2. (a) Enlist the objectives of biological treatment. [03]
   

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   (b) The 3 day 37°C BOD of a sample of sewage is 300 ppm. What will be its 10 days 20°C BOD and 5 days 30°C BOD. Assume K_p = 0.12/Day (Base 10) at 20°C and ? = 1.056 [04]
   (c) What is BOD, COD & TOC? Deduce an expression for BOD with time. [07]
   OR
   (c) Explain the terms: (i) F/M ratio, (ii) MCRT/SRT, (iii) Specific growth rate, (iv) Specific substrate utilization rate, (v) Growth yield, (vi) Half velocity Constant & (vii) MLVSS.
3. (a) Write down set of equations for Least Square method and explain the terminology. [03]
   

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   (b) What is the role of microorganism in wastewater treatment? [04]
   (c) Enlist and explain the factors affecting the BOD test. [07]
   OR
   (a) Write a short note on Bio-towers. [03]
   (b) Differentiate between Anoxic and Anaerobic process. [04]
   

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   (c) Write down the mass balance for CFSTR with recycle and hence Derive the equation for finding biokinetic constant. [07]
4. (a) Discuss the problems of bulking and foaming of sludge in ASP. [03]
   (b) Explain single stage and two stage trickling filter with sketch. [04]
   (c) Explain working of rotating biological contactor with the help of a neat sketch. [07]
   OR
   

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   (a) Explain when anaerobic conditions will develop in a trickling filter. [03]
   (b) How step aeration is differ than tapered aeration in ASP? [04]
   (c) Explain the difference between oxidation ditch & oxidation pond. [07]
5. (a) Derive the relationship to find the amount of methane per gram of COD. [03]
   (b) An anaerobic reactor, operated at 35°C, processes a wastewater stream with a flow of 3500 m³/d and a bsCOD conc. of 4600 g/m³. At 98% bsCOD removal & a net biomass synthesis yield of 0.038 g VSS/g COD used, what is the amount of methane and total gas produced in m³/d? If 70% part of gas is methane. [04]
   

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   (c) Write down the fundamental mechanism of anaerobic digestion with Process description & Microbiology. [07]
   OR
   (a) Enlist the different types of natural treatment system. [03]
   (b) Write a short note: constructed wetlands. [04]
   (c) Discuss the fundamental considerations in the application of natural treatment systems. [07]

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