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Seat No.: Enrolment No.
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (New) EXAMINATION - WINTER 2018
Subject Code:2134004 Date:12/12/2018
Subject Name:Green Chemistry & Technology
Time:10:30 AM TO 01:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
MARKS
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Q1 i Define aeration and flocculation 1
ii Name any three coagulants used for the water treatment process. 1
iii A circular primary clarifiers processes an average flow of 5005 2 m’/day of municipal waste water. The overflow rate is 35 m3/m?/d. The diameter of clarifier will be......
iv. The reoxygenation coefficient K of stream is 0.30 at 20°C. Its K 2 value at 32°C likely to be.............
v Define BOD. 1
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vi Chemical oxygen demand of a sample is always greater than 1 Biochemical Oxygen Demand Since it represent...
vii A single rapid test to determine the pollution status of river water 1
viii Hardness of water is caused by the presence of ......... 1
ix The Ca?* and Mg*" concentration of water sample are 160 mg/lit 2 and 40 mg/lit as their ions respectively. The total hardness of water in terms of /CaCO; in mg/lit is approximately equal to.............
X Methaemoglobinemia in children is caused by the presence of 1 excess....
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xi The microbial quality of treated piped supplies is monitered 1 by.......
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Q2 a What do you mean by Indoor pollution give example? How you 4 can save yourself from indoor pollution.
b Write the tabular form of national ambient air quality standards. 3
c Using the given information find the population of city in 2010 7 and 2030 using geometrical increase method and incremental increase methods
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Year 1940 1950 1960 1970 1980 1990 Population 23400 65700 92800 102760 130900 187970
OR
Q2 a What are the pH of acid rains, normal rains, pure water, battery 4 acid and ocean water, lemon juice, vinegar and milk?
b What do you mean by greenhouse effect. Enlist the gases 3 responsible for greenhouse effect.
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Q3 What is acid rain and what is its effects on the environment?
Enlist the gases responsible for the acid rains.
Find the settling velocity of spherical silica particle of specific gravity 2.67, in water at 25°C, if the diameter of particles is 0.004 cm.
Describe briefly about turbidity.
Write short notes on (a) Flouride content (b) chloride content and (c) Nitrate content into the drinking water.
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OR
In continuous flow settling tank 3.5 m deep and 65 m long. Flow velocity of water is observed as 1.22 cm/sec. What size of particle of specific gravity 2.65 may be effectively removed in this tank, if kinematic viscosity of water is 0.01cm?/sec.
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Q4 Write the standard value of following parameters for the drinking water. (i) Hardness (ii) Chloride (iii) Calcium (iv) pH (v) Flouride (vi) Nitrite
The capacity of a water treatment plant is to treat 18 MLD of raw water and the dose of required alum (A1,SO4)3.18H,O is 25 PPM. Find
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(a) Total quantity of alum required per year
(b) Total quantity of CO, gas produced per year
(c) Total quantity of floc generated per year
(d) Total quantity of hardness-per year
Comment on the challenges for sustainable development in our country and suggest a way-to overcome the same.
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It is said “prevention is better than cure”. Justified this statement in context to green chemistry.
A rapid sand filter proposed for a water supply treatment plant of town having population of 75000, average water supply in the town is 150 lpcd, rate of filtration is 100 lit/m?/min. Find the size and no of filter bed required. Design the lateral and manifold under drainage system. Compute the washwater discharge required if rate of washing is 45 cm/min.
OR
The BOD;s of a waste has been measured as 500 mg/lit. If the rate constant K’ = 0.26/day (base ¢), what is the ultimate BOD of waste? What proportion of BOD, would remain unoxidaised after 20 days.
Mention various methods used to dispose solid wastes along with their merits and demerits
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The following data refers to an ASP: (i) sewage discharge = 3500 m>/day (ii) volume of tank 10900 m? (iii) Influent BOD = 250 PPM (iv) Effluent BOD = 20 PPM (v) MLSS = 2500 PPM (vi)
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Q5 Effluent suspended solids = 30 PPM (vii)) Waste sludge suspended solids = 9700 PPM (viii) quantity of waste sludge = 220 m’/day.
Find (1) HRT (i1) F/M ratio (iii) Efficiency (iv) Residence time (v) SVI if settled volume is 150 mL/litre (vi) sludge return ratio
Explain the construction of solar panel with the utilization of solar energy for various purposes.
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Describe the tidal energy with advantage and disadvantage.
What would be your suggestion towards 21* century energy resources?
OR
Design a wind turbine and estimate the required wind turbine power rating using following data: (i) Annual energy requirement — 25000 kWh (i1) coefficient of performance — 0.40 (iii) density of air — 1 kg/m® (iv) capacity factor — 0.30 (v) number of hours in a year 8760 hours (vi) wind speed at 15 m height is 7 m/sec.
Design a sedimentation tank for the city of Stillwater treatment plant expansion using high-rate settlers. The maximum day design flow is 0.5 m*/s. Assume a well settling alum floc, a water temperature of 10°C, that the angle of settler tube is 60°, and that the tubes have a hydraulic diameter of 50 mm and surface overflow rate is 150 m3/m?/day. Assume suitable necessary data.
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