Environmental Engineering Questions and Answers – Oxidation and Stabilization Ponds

This set of Environmental Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Oxidation and Stabilization Ponds”.

1. Which of the following is an anaerobic process for treating sewage?
a) Oxidation pond
b) Imhoff tank
c) Oxidation ditch
d) Rotating Biological Contactors
View Answer

Answer: b
Explanation: Oxidation pond, Oxidation ditch and Rotating Biological Contactors are an aerobic process of treating sewage whereas Imhoff tank is an anaerobic process of treating sewage.

2. The minimum design depth of oxidation pond is ___________
a) 0.3m
b) 0.5m
c) 1m
d) 1.5m
View Answer

Answer: c
Explanation: The minimum design depth of oxidation pond is 1m while its maximum design depth is 1.5m.

3. Oxidation pond is ineffective in removing pathogenic bacteria.
a) True
b) False
View Answer

Answer: b
Explanation: Oxidation pond is highly efficient in removing pathogenic bacteria with an efficiency of 99.9%.
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4. The detention period of oxidation pond is ___________
a) 12-36 hours
b) 4 hours
c) 10-20 days
d) 30-60 seconds
View Answer

Answer: c
Explanation: Oxidation ponds have a long detention period between 10 to 20 days.

5. The maximum BOD removal efficiency of an oxidation pond is ___________
a) 90%
b) 68%
c) 70%
d) 80%
View Answer

Answer: a
Explanation: The BOD removal efficiency of an oxidation pond lies between 80% and 90%, so the maximum BOD removal efficiency is 90%.
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6. What is the minimum depth of water to be kept in the oxidation pond?
a) 0.3m
b) 0.5m
c) 1m
d) 1.5m
View Answer

Answer: c
Explanation: The minimum depth of water to be kept in the oxidation pond is 0.3m and the depth of sludge deposited in the pond is 0.02m per year.

7. Which chemical is added to the oxidation pond to avoid bad odor?
a) Calcium chloride
b) Sodium nitrate
c) Potassium chloride
d) Silver nitrate
View Answer

Answer: b
Explanation: Sodium nitrate is added to the oxidation pond to avoid bad odor. It acts as an oxidizing agent and also as the food of the plant.
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Sanfoundry Global Education & Learning Series – Environmental Engineering.

To practice all areas of Environmental Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

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If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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