Below the 1000+ Questions with detail solution on sewage treatment of Environmental Engineering, which were asked in various competitive exams of Civil Engineering
Question 1.
A major disadvantage of using chlorine for disinfection in sewage treatment is that
Previously Asked in : SKUAST Civil Engineer Civil (post code: 71) ||
It is ineffective against viruses
It can form harmful by-products
It does not kill bacteria
It is too expensive to use
Answer (Detailed Solution Below)
Option It can form harmful by-products is correct
Detailed Solution :
Advantages of Chlorination of Water
- Kills harmful and pathogenic microorganisms.
- Prevents waterborne diseases.
- Maintains water quality during distribution.
- Provides residual protection.
- Cost-effective water treatment method.
Disadvantages of Chlorination of Water
- Limited effectiveness against some parasites and viruses.
- Unpleasant taste and odour.
- Formation of potentially harmful disinfection byproducts.
- Allergic reactions in some individuals.
- Corrosive to certain materials and equipment.
Question 2.
If 2% diluted wastewater sample incubated at 20 degrees centigrade resulted in DO depletion of 8 mg/l, BOD of the sample is:
Previously Asked in : OSSC JE Civil main Re exam 23 sept…. ||
100mg/l
400 mg/l
200 mg/l
300 mg/l
Answer (Detailed Solution Below)
Option 400 mg/l is correct
Detailed Solution :
we know that,
dilution factor = 100 / %solution = 100/2 = 50
Depletion of oxygen = 8 ppm or mg/l
BOD5 = Depletion of oxygen x Dilution factor
BOD5 = 8 x 50 = 400 ppm
So correct option is 400 ppm
Question 3.
The F/M (food/micro organism) ratio is controlled in the activated sludge process by adjusting the
Previously Asked in : GATE- CE ||
Flow rate
Volume of aeration tank
Amount of sludge wasting
BOD
Answer (Detailed Solution Below)
Option Flow rate is correct
Detailed Solution :
The F/M (food to Micro organism) ratio is a critical parameter in the parameter in the activated sludge process for wastewater treatment.
It represents the balance between the organic matter (food) available and the microbial biomass (micro organisms) present in the system.
Adjusting this ratio is vital for optimizing microbial activity and ensuring efficient waste degradation.
This can be managed by controlling the flow rate of wastewater into the system, the volume of the aeration tank, and the amount of sludge that is waste
Question 4.
what is the main role of clarifier in sewage treatment
Previously Asked in : SKUAST Civil Engineer Civil (post code: 71) ||
To separate solids from liquids
To provide a platform for biological growth
To add chemicals to the sewage
To filter out large debris
Answer (Detailed Solution Below)
Option To separate solids from liquids is correct
Detailed Solution :
The main role of a clarifier in sewage treatment is to separate suspended solids from liquid effluent through sedimentation.
This process helps to improve water quality and ensure that the water meets regulatory standards for discharge
some other roles of a clarifier in sewage treatment:
- Removes floating matter
- Produces sludge
- Stabilizes flow
Question 5.
which of the following is a group including only aerobic treatment units for sewage treatment?
Previously Asked in : FCI JE Civil 2015 ||
Trickling filter, Septic tank, Oxidation pond.
Trickling filter, Oxidation pond, Imhoff tank.
Septic tank, Imhoff tank, Sludge digestion tank.
trickling filter, Oxidation pond, Activated sludge plant.
Answer (Detailed Solution Below)
Option trickling filter, Oxidation pond, Activated sludge plant. is correct
Question 6.
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Solution (Detailed Solution Below) click here
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Detailed Solution :
Question 7.
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Solution (Detailed Solution Below) click here
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Detailed Solution :
Question 8.
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Solution (Detailed Solution Below) click here
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Detailed Solution :
Question 9.
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Solution (Detailed Solution Below) click here
option aaaa is correct
Detailed Solution :
Question 10.
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Solution (Detailed Solution Below) click here
option aaaa is correct
Detailed Solution :
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