STUPIDSID
Answer any one question from Q.1 and Q.2
1(a)
State the procedure for DO fixation and hence explain the necessity of DO fixation during determination of DO in water.
5 M
Answer any one question from Q.1 and Q.2
1(a)
Differentiate between domestic sewage and storm water runoff. Explain giving reasons, when to adopt separate and combined systems of sewage.
5 M
1(b)
Find min velocity and gradient required to carry coarse sand particles of size 1.5 mm and specific gravity 2.65 through a sewer of diameter 0.9m. Assume constants beta = 0.04, f = 0.03 and N = 0.013. The sewer may be assumed to run half full.
5 M
1(b)
Explain the procedure of B.O.D. test when seeding of wastewater is required.
5 M
2(a)
Write Streeter-Phelps equation and meaning each term involved in it.
5 M
2(a)
What do you understand by self purification property of stream? Explain the factors affecting this property.
5 M
2(b)
Write a short note on pumping of sewage.
5 M
2(b)
Explain the significance of maximum and minimum velocities to be maintained sewer.
5 M
Answer any one question from Q.3 and Q.4
3(a)
Design a bar screen for a peak flow of 25 MLD.
5 M
Answer any one question from Q.3 and Q.4
3(a)
How the following sewage treatment units helping to treat the waste water?
i) Screens
ii) Grit chambers
iii) Primary Sedimentation tank.
i) Screens
ii) Grit chambers
iii) Primary Sedimentation tank.
5 M
3(b)
What do you understand by trickling filter? Explain in detail with a neat sketch and biological processes involved in it.
5 M
3(b)
Design a gift chamber to neat domestic sewage of a town having discharge 1595 m3/hr. Assume specific gravity of grit as 0.2 mm. Take the temperature of sewage = 10°C. Provide constant velocity of sewage in the chamber of 40 cm/sec.
5 M
4(a)
Explain the purpose of providing grit chamber and give design criteria for grit chamber.
5 M
4(a)
Draw and explain process flow diagram for sewage treatment.
5 M
4(b)
Explain terms with respect to activated sludge process.
i) HRT.
ii) SRT.
iii) MCRT.
iv) F/M Ratio.
i) HRT.
ii) SRT.
iii) MCRT.
iv) F/M Ratio.
5 M
4(b)
Give discharge standard of BOD, COD, TSS, TDS Sulphates, Chlorides and Total Nitrogen on to land as irrigation water as per CPCB.
5 M
Answer any one question from Q.5 and Q.6
5(a)
Explain with a neat sketch, the constructional features of a facultative stabilisation pond.
Discuss the phytoremediation technology for waste water treatment.
Discuss the phytoremediation technology for waste water treatment.
8 M
Answer any one question from Q.5 and Q.6
5(a)
Give the flow diagrams of single stage and two stage Trickling Filters.
5 M
5(b)
Explain the principle of working of aerated lagoon. Also state the merits and demerits over aerated lagoon.
8 M
5(b)
Determine the size of a high rate trickling filter for the following data:
i) Sewage flow = 4.5MLD
ii) Recirculation ratio = 1.5
iii) BOD of raw sewage = 250mg/L
iv)BOD removal in primary tank = 30%
v) Final Effluent BOD desired = 30mg/L
i) Sewage flow = 4.5MLD
ii) Recirculation ratio = 1.5
iii) BOD of raw sewage = 250mg/L
iv)BOD removal in primary tank = 30%
v) Final Effluent BOD desired = 30mg/L
5 M
6(a)
Differentiate between oxidation pond and aerated lagoon, with reference to HRT, organic loading method of aeration and operation cost.
8 M
6(a)
An average operating data for conventional activated sludge treatment plant is as follows:
i) Wastewater flow = 35000 cum/day
ii) Volume of aeration tank = 10900 cum
iii) influent BOD = 250 mg/L
iv) Effluent BOD = 20 mg/L
v) MLSS = 2500 mg/L
vi) Effluent SS = 30 mg/L
vii) Waste sludge SS = 9700 mg/L
viii) Quantity of waste sludge 200 cum/day
Based on information above determine
i) Aeration period (hrs)
ii) F/M ratio
iii) % efficiency of BOD removal
iv) Sludge age (days)
i) Wastewater flow = 35000 cum/day
ii) Volume of aeration tank = 10900 cum
iii) influent BOD = 250 mg/L
iv) Effluent BOD = 20 mg/L
v) MLSS = 2500 mg/L
vi) Effluent SS = 30 mg/L
vii) Waste sludge SS = 9700 mg/L
viii) Quantity of waste sludge 200 cum/day
Based on information above determine
i) Aeration period (hrs)
ii) F/M ratio
iii) % efficiency of BOD removal
iv) Sludge age (days)
5 M
6(b)
Explain root zone cleaning system for wastewater treatment.
8 M
6(b)
Discuss the various modifications in basic Activated Sludge Process.
5 M
Answer any one question from Q.7 and Q.8
7(a)
What do you understand by digestion of sludge? Differentiate between anaerobic and aerobic digestion.
8 M
7(b)
Write short note on sludge drying bed.
8 M
8(a)
What do you understand by sludge thickening? Enumerate various methods. Describe with help of sketch gravity sludge thickener.
8 M
8(b)
Write short note on UASB process for waste water treatment.
8 M
Answer any one question from Q.9 and Q.10
9(a)
Give the range of important characteristics of waste from following industry and draw a suitable flow diagram for treatment for each industry.
a) Sugar industry
b) Dairy industry
c) Distillery industry.
a) Sugar industry
b) Dairy industry
c) Distillery industry.
18 M
10(a)
Write short note on.
i) Equalization.
ii) Neutralization.
i) Equalization.
ii) Neutralization.
9 M
10(b)
Discuss in brief various treatment processes adopted for treating industrial waste water.
9 M
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