Enrolment No.
/Seat No_______________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER–VI (NEW) EXAMINATION – WINTER 2024
Subject Code: 3160611 Date:25-11-2024
Subject Name: Environmental Engineering
Time: 02:30 PM TO 05:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.
MARKS
Q.1 (a) Enlist components of water supply scheme. 03
(b) Define seasonal fluctuation and design period in water supply scheme. 04
Define Intake structure, enlist type of intake structure and explain any
(c) 07
one in detail.
Q.2 (a) What is turbidity and enlist various methods to determine turbidity. 03
(b) Define spigot and socket joint and Reflux valve. 04
Draw layout of water treatment plant and briefly explain the different
(c) 07
treatment unit.
OR
What is aeration, enlist different type of aeration, explain any one in
(c) 07
detail.
Q.3 (a) Differentiate between BOD and COD. 03
(b) Explain Oxygen sag curve with diagram. 04
Explain the process of sludge digestion and discuss the factors that affect
(c) 07
its efficiency in wastewater treatment.
OR
Q.3 (a) Explain sewage sickness. 03
(b) Write short note on screening in waste water treatment, 04
What is a trickling filter? Explain its working principle, components, and
(c) 07
applications in wastewater treatment.
Q.4 (a) Define soil pipe and vent pipe. 03
(b) Differentiate between one pipe system and two pipe system. 04
(c) Define sewer and explain different type of sewer. 07
OR
Q.4 (a) Define sewage and sullage. 03
(b) Write short note on Intercepting trap and catch basin. 04
(c) Explain methods of collection of sewage with their merits and demits. 07
Q.5 (a) Write short note on EIA. 03
(b) Define Bio medical waste and enlist the sources of Biomedical waste. 04
Enlist different methods of solid waste disposal and explain any one in
(c) 07
detail
OR
Q.5 (a) Explain how Noise pollution affect working efficiency of human being. 03
(b) Explain effects of air pollutant on human health. 04
(c) Enlist different air pollutants and explain any two in detail. 07
*****
Enrolment No./Seat No_____________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER–VI (NEW) EXAMINATION – SUMMER 2024
Subject Code:3160611 Date:17-05-2024
Subject Name:Environmental Engineering
Time:10:30 AM TO 01:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.
MARKS
Q.1 (a) Compute pH and pOH values of freshly distilled water at 21ºC. 03
(b) Which are the sources of water? Mention the factors affecting selection 04
of water source.
(c) Draw a neat flow chart of a Domestic Wastewater Treatment Plant. 07
Enlist the function of each unit.
Q.2 (a) What is necessity of using coagulants in sedimentation? Explain the 03
principle of coagulation.
(b) Enlist different chemical characteristics of water and discuss about 04
Total Dissolved Solids with their environmental significance.
(c) What are the different types of pipes used for water supply? Discuss 07
Asbestos cement (A.C.) pipes and Steel pipes in detail.
OR
(c) What is an intake structure? Sketch and explain construction and 07
working of a river intake.
Q.3 (a) Differentiate between temporary hardness and permanent hardness. 03
(b) Make a list of various forms of chlorination and explain break point 04
chlorination with graph.
(c) Sketch and explain construction and working of trickling filter. 07
OR
Q.3 (a) Explain aerobic decomposition and anaerobic decomposition of 03
sewage.
(b) What do you mean by self-purification? Explain with the sketch the 04
oxygen sag curve.
(c) Give comparison between slow sand filter and rapid sand filter. 07
Q.4 (a) Define: Garbage, Rubbish and Sewage. 03
(b) Describe activated sludge process with sketch. 04
(c) Write a short note on the layout of distribution systems which are 07
commonly used in India.
OR
Q.4 (a) Define (1) Vent pipe (2) Rain water pipe (3) anti siphonage pipe 03
(b) Enumerate different shapes of sewers and describe circular sewer 04
section.
(c) Explain 1st stage BOD and derive its formula with usual notations Lt= 07
Lo [1 - (10) -Kt]
Q.5 (a) Give classification of Municipal Solid Waste. 03
(b) Explain design procedure of septic tank. 04
(c) What are the objectives of Environmental protection Act, 1986. Explain 07
power of central government.
OR
Q.5 (a) How is Noise measured? Describe the methods of controlling Noise 03
pollution.
(b) Explain primary and secondary air pollutants. 04
(c) What is sanitary land filling? Describe the different factors to be 07
considered for the site selection of sanitary land filling.
********************
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER–VI (NEW) EXAMINATION – WINTER 2023
Subject Code:3160611 Date:05-12-2023
Subject Name: Environmental Engineering
Time:02:30 PM TO 05:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.
MARKS
Q.1 (a) What are the requirements of good distribution system? 03
(b) What control measures should be taken to prevent the outbreak of 04
waterborne diseases?
(c) Explain different factors affecting the water demand. 07
Q.2 (a) The pH of influent and effluent of an Industry is 5.3 and 8.4 respectively. 03
Find average pH of waste water.
(b) Write site selection criteria for an intake structure. 04
(c) Make a list of various forms of chlorination and explain breakpoint 07
chlorination.
OR
(c) Explain working of centrifugal pump with neat sketch. 07
Q.3 (a) Find the settling velocity of a discrete particles in water, having particle 03
diameter 7 x 10-3 cm and specific gravity 2.65. Assume Reynolds’s number
less than 0.5. Water temperature is 200 C and kinematic viscosity of water
at 200 is 1.01 x 10-2 cm2/sec.
(b) If the 5 day BOD at 200 c temperature of a waste water sample is found to 04
be 180 mg/lit, find 3 day BOD at 300C temperature of the sample. Assume
KD(20) = 0.1/day
(c) Draw a complete flow diagram of waste water treatment plant and describe 07
the function of each unit.
OR
Q.3 (a) Explain in brief” Sewage sickness”. 03
(b) Enlist different biological processes. Differentiate suspended growth 04
process and attached growth process.
(c) Design a bar screen for a peak average flow of 65 million liters per day 07
Q.4 (a) Define following. 03
(1) Sullage (2) Rubbish (3) Soil pipe.
(b) State the requirements of good sewer joint. Enlist common types of 04
joints used in sewer.
(c) Differentiate between Rapid sand filter and Slow sand filter. 07
OR
Q.4 (a) Why circular sewers are more preferred for the sewerage system? 03
(b) Classify the traps according to shape and describe with sketch the 04
same.
(c) Describe different system of plumbing with neat sketch. 07
Q.5 (a) What is solid waste management? Enlist its objectives. 03
(b) Explain the effect of air pollution on human health. 04
(c) Write a short note on “Sanitary land filling”. 07
1
OR
Q.5 (a) Describe the methods of controlling noise pollution. 03
(b) Discuss in brief “EIA”. 04
(c) Give classification of air pollutants and explain in brief various 07
sources of air pollutants.
*************
2
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER–VI (NEW) EXAMINATION – SUMMER 2023
Subject Code:3160611 Date:06-07-2023
Subject Name:Environmental Engineering
Time:10:30 AM TO 01:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.
MARKS
Q.1 (a) Enlist different unit processes and units operations used for wastewater 03
treatment.
(b) Design an intake well for handling 0.18 m3/sec of water. 04
(c) Explain following chemical characteristics of water in detail: 07
1. Hardness 2. Alkalinity 3. Solids
Q.2 (a) Define Intake. Enlist different types of intakes used in the water supply 03
scheme.
(b) Find the area of the rapid sand filter as well as number of beds required for 04
treating 11 MLD of water. Also find the size of each filter bed.
(c) What is coagulation? When it is required? Explain how to find the optimum 07
dose of the coagulant required for water treatment.
OR
(c) Why and when back washing is required in rapid sand filter? Draw a neat 07
cross section of a bed of rapid sand filter.
Q.3 (a) Differentiate between BOD and COD. 03
(b) Draw a layout of a typical sewage treatment plant having an activated 04
sludge unit as secondary treatment unit.
(c) Design a flash mixer for a design flow of 240 m3/hr. 07
OR
Q.3 (a) State the advantages and disadvantages of gird iron system used for 03
distribution of the water.
(b) Explain oxygen sag curve with neat sketch. 04
(c) Design a Plain sedimentation tank for treating 7 MLD of water. 07
Q.4 (a) Define: 1. Garbage 2. Rubbish 3. Leachate. 03
(b) Explain with flow chart, the steps used for Environment Impact 04
Assessment.
(c) A combined sewer is to be designed to serve an area of 15 km2 with a 07
population density of 300 person/hectare. The average rate of sewage flow
is 320 lpcd. The maximum flow is 60% in excess of average together with
the rainfall equivalent of 14 mm in 24 hour, all of which appears as runoff.
Determine the size of the circular sewer required. Assume maximum
velocity of flow as 2.0 m/s.
1
OR
Q.4 (a) Draw the flow chart showing all the functional elements of solid waste 03
management system.
(b) Explain different types of traps used in the house drainage system. 04
(c) A single stage trickling filter is required to treat 5 MLD of sewage having 07
BOD of 200 mg/lit. Take Organic loading rate = 11000 kg/ha-m/day and
recirculation ratio=1. Find the effluent BOD of the filter. Assume BOD
removal by PST=30%.
Q.5 (a) Give the classification of air pollutants. 03
(b) Design a septic tank for a colony of 140 persons. Assume rate of water 04
supply as 135 lpcd.
(c) Explain the different control measure for noise pollution. 07
OR
Q.5 (a) If 4 day BOD of a sample at 25 ̊ C is 200 mg/lit, find its 5 day BOD at 03
35 ̊C.
(b) State the principles of house drainage system. 04
(c) Explain the effect of air pollution on plants, building material and human 07
health.
*************
2
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER–VI(NEW) EXAMINATION – WINTER 2022
Subject Code:3160611 Date:14-12-2022
Subject Name:Environmental Engineering
Time:02:30 PM TO 05:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.
MARKS
Q.1 (a) Find out how much acidic is sample pH 3.0 compared to pH 6.0. 03
(b) Define BOD. Give the significance of BOD test for wastewater. 04
(c) Draw a neat flow chart of a Domestic Wastewater Treatment Plant. 07
Enlist the function of each unit.
Q.2 (a) What do you understand by sedimentation with coagulation? 03
(b) Enlist different chemical characteristics of water and discuss about 04
acidity with their environmental significance.
(c) What are the different types of pipes used for water supply? Discuss cast 07
iron pipes and concrete pipes in detail.
OR
(c) What is an intake structure? Sketch and explain construction and 07
working of a river intake.
Q.3 (a) Differentiate between temporary hardness and permanent hardness. 03
(b) Explain break point chlorination. 04
(c) Sketch and explain construction and working of trickling filter. 07
OR
Q.3 (a) Explain aerobic decomposition and anaerobic decomposition of sewage. 03
(b) What do you mean by self-purification? Explain with the sketch the 04
oxygen sag curve.
(c) Give comparison between slow sand filter and rapid sand filter. 07
Q.4 (a) Define: Garbage, Rubbish and Sewage. 03
(b) Describe activated sludge process with sketch. 04
(c) Write a short note on the layout of distribution systems which are 07
commonly used in India.
OR
Q.4 (a) Draw a house drainage plan for a 3BHK detached bungalow 03
(b) Describe trickling filter with sketch. 04
(c) Explain 1st stage BOD and derive its formula with usual notations Lt= 07
Lo [1 - (10) -Kt]
Q.5 (a) Write a short note on composting. 03
(b) Explain design procedure of septic tank. 04
(c) Discuss different methods of sewage disposal. 07
OR
Q.5 (a) What is noise pollution? State the sources of it. 03
(b) Explain the effects of air pollution on men, material and animals. 04
(c) What is sanitary land filling? Describe the different factors to be 07
considered for the site selection of sanitary land filling.
**************
