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Name
Reg No

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
07 THRISSUR CLUSTER
FIRST SEMESTER M.TECH. DEGREE EXAMINATION DEC 2017
Civil Engineering Department
Environmental Engineering
07CE6105
PHYSICO CHEMICAL METHODS IN ENVIRONMENTAL
ENGINEERING
Time 3 hours Max.Marks: 60
Answer all six questions. Part of each question is compulsory.
Answer either part or part of each question
Q.no. Module 1 Marks
1a Explain the different types of reactions with suitable examples. 4
Answer b or c
b Derive the mass balance analysis of an Ideal Plug Flow Reactor 5
c Determine the reaction order and reaction rate coefficient for the following data
Time(days) 0 1 2 3 4 5 6 7 8
Concentration(mole/l) 250 70 42 30 23 18 16 13 12
5
Q.no. Module 2 Marks
2a Explain briefly the different types of bar screens 4
Answer b or c
b Explain the different types of equalization process with flow diagrams. How will
you calculate the capacity of an equalization basin?
5
c The following curve was obtained from a settling test data in a 3m cylinder.The
initial solids concentration was 3600 mg/l. Determine the thickener area
required for a concentration Cu of 12000 mg/l with a solids flow 1500 m3/day
5
0
0.5
1
1.5
2
2.5
3
0 10 20 30 40 50 60
Height(ms)
Time(minutes)
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Q.no. Module 3 Marks
3a Explain lamella plate clarification with a neat sketch 4
Answer b or c
b Determine the settling velocities of ballasted floc, spherical and wastewater
particles having the following characteristics
parameter Particle type
Average dia in 200 150 500
Particle sp.gravity 2.6 2.65 1.0035
Shape factor 2.5 1 1.8
Wastewater Sp. gr 1.003 1.003 1.003
5
c Determine the theoretical power requirement and the paddle area required to
achieve a G value of 50/S in a tank with a volume of 3000 m3. Assume the
water temp is 15OC, CD is 1.8, paddle tip velocity v is 0.6 m/s and relative
velocity of paddles vp is 0.75 times v
5
Q.no. Module 4 Marks
4a Explain the different factors influencing the disinfection process. 4
Answer b or c
b Determine the headloss through a 600 mm sand bed composed of spherical,
unisized sand with a dia of 0.55 mm, porosity of sand is 0.4, filtration velocity is
240 L/m2-min Kinematic viscosity is 1.306 x10-6 m2/s
5
c Discuss the various problems in filters and how can they solved? 5
Q.no. Module 5 Marks
5a Explain the chemistry of chlorination process. 5
Answer b or c
b Estimate the daily required Cl2 dosage and the resulting build up of TDS when
Break point chlorination is used for the seasonal control of N2. Assume the
following data.
Plant flow rate= 38 m3/day
Effluent characteristics{ BOD 2 TSS= 25 NH3-N= 23 mg/l
Required effluent NH3-N= 1 mg/l
7
c Explain the various advanced Oxidation process in detail 7
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Q.no. Module 6 Marks
6a Explain the theory of electrodialysis process 5
Answer b or c
b Determine the flux rate coefficient and mass transfer coefficient for the given
data
Flowrate of feed stream 5500 m3/day
Influent TDS= 3300 Effluent TDs= 500 g/m3
Net operating pressure= 2500 KPa
7
c Give the advantages and disadvantages of Reverse Osmosis process 7
(Note: The sub question will be compulsory one, testing the knowledge on fundamental
aspects. Parts and shall preferably be application type questions with the choice to
answer any one.)