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Environmental Engineering
Sources and Coveyances Water
Marks 1Marks 2
Quality Control of Water
Marks 1Marks 2
Treatment of Water
Marks 1Marks 2
Water Demand
Marks 1Marks 2
Waste Water Characteristics
Marks 1Marks 2
Sewage System and Sewer Appurtenances
Marks 1
Treatment of Sewage
Marks 2
Disposal of Sewage Effluent
Marks 1Marks 2
Solid Waste Management
Marks 1Marks 2
Air Pollution
Marks 1Marks 2
Noise Pollution
Marks 1
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1
GATE CE 2025 Set 1
MCQ (More than One Correct Answer)
+2
-0
A facultative pond system is employed for wastewater treatment. Which of the following statements is/are true:
A
The dissolved oxygen concentration will be high during daytime compared to nighttime
B
The pH will be high during daytime compared to night-time
C
The dissolved oxygen concentration will be low during daytime compared to nighttime
D
The pH will be low during daytime compared to night-time
2
GATE CE 2023 Set 1
MCQ (Single Correct Answer)
+2
-0.66

In the following table, identify the correct set of associations between the entries in Column - 1 and Column-2.

Column-1 Column-2
P: Reverse Osmosis III: Concentration Polarization
Q: Trickling Filter I: Ponding
R: Coagulation IV: Charge Neutralization
S: Adsorption II: Freundlich Isotherm
A
P - II, Q - I, S - III
B
Q - III, R - II, S - IV
C
P - IV, R - I, S - II
D
P - III, Q - I, R - IV
3
GATE CE 2023 Set 1
Numerical
+2
-0
The wastewater inflow to an activated sludge plant is 0.5 m3/s, and the plant is to be operated with a food to microorganism ratio of 0.2 mg/mg-d. The concentration of influent biodegradable organic matter of the wastewater to the plant (after primary settling) is 150 mg/L, and the mixed liquor volatile suspended solids concentration to be maintained in the plant is 2000 mg/L. Assuming that complete removal of biodegradable organic matter in the tank, the volume of aeration tank (in m3, in integer) required for the plant is _________.
Your input ____
4
GATE CE 2022 Set 2
MCQ (Single Correct Answer)
+2
-0.67

In a city, the chemical formula of biodegradable fraction of municipal solid waste (MSW) is C100H250O80N. The waste has to be treated by forced-aeration composting process for which air requirement has to be estimated.

Assume oxygen in air (by weight) = 23% and density of air = 1.3 kg/m3. Atomic mass : C = 12, H = 1, O = 16, N = 14.

C and H are oxidized completely whereas N is converted only into NH3 during oxidation.

For oxidative degradation of 1 tonne of the waste, the required theoretical volume of air (in m3/tonne) will be (round off the nearest integer)

A
1092
B
4749
C
1418
D
8025
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Questions Asked from Marks 2
GATE CE 2025 Set 2 (1) GATE CE 2025 Set 1 (1) GATE CE 2023 Set 1 (2) GATE CE 2022 Set 2 (2) GATE CE 2022 Set 1 (1)
GATE CE Subjects
Engineering Mechanics
Strength of Materials Or Solid Mechanics
Structural Analysis
Construction Material and Management
Reinforced Cement Concrete
Steel Structures
Geotechnical Engineering
Fluid Mechanics and Hydraulic Machines
Hydrology
Irrigation
Geomatics Engineering Or Surveying
Environmental Engineering
Transportation Engineering
Engineering Mathematics
General Aptitude