Hazardous Waste Management Questions and Answers – Biological Treatment – Aerobic Systems

This set of Hazardous Waste Management Multiple Choice Questions & Answers (MCQs) focuses on “Biological Treatment – Aerobic Systems”.

1. What is the minimum oxygen requirement to promote growth of aerobic bacteria?
a) 0.2 ppm
b) 0.3 ppm
c) 0.4 ppm
d) 0.5 ppm
View Answer

Answer: d
Explanation: Minimum requirement of 0.5 ppm free dissolved oxygen is essential to promote the growth of aerobic bacteria.

2. The temperature range for aerobic process is __________ degree Celsius.
a) 10-20
b) 10-30
c) 10-40
d) 10-50
View Answer

Answer: b
Explanation: The temperature range for aerobic process is 10-30 degree Celsius i.e. the psychrophilic range.

3. The concentration of microorganisms in the digestion tank is measured as _________
a) MLSS
b) MLC
c) MLD
d) MKLS
View Answer

Answer: a
Explanation: Microorganisms concentration in the digestion tank is measured as mixed liquor suspended solids (MLSS) or volatile suspended solids (VLS).
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4. Which of the following is function of the MLSS content of the hazardous waste liquor?
a) BOD loading
b) COD loading
c) MLSS loading
d) VLS loading
View Answer

Answer: a
Explanation: The BOD loading on biological system in terms of kg BOD/m3 of reactor volume/day is function of the MLSS content of the hazardous waste liquor.

5. Higher loading level increase BOD removal efficiency.
a) True
b) False
View Answer

Answer: b
Explanation: Higher loading rate decrease BOD removal efficiency, increase sludge production and induce sludge bulking in the system.
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6. What is the organic loading rate in aerobic fixed culture systems?
a) 1-9 kg BOD/m3
b) 1-7 kg BOD/m3
c) 1-8 kg BOD/m3
d) 1-5 kg BOD/m3
View Answer

Answer: c
Explanation: Organic loading rate in aerobic fixed culture systems vary from 1–8 kg BOD/m3 tower volume/day.

7. What is the average retention time in aerobic treatment system?
a) 20 minutes
b) 10 minutes
c) 30 minutes
d) 40 minutes
View Answer

Answer: a
Explanation: Average retention times in aerobic systems range from 20 minutes in biological filters to 24 hours in activated sludge plants.

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8. In aerobic treatment, microbes need carbon source.
a) True
b) False
View Answer

Answer: a
Explanation: In aerobic treatment, microbes need carbon and energy source to oxidize hazardous waste and nutrients such as nitrogen, phosphorus and trace metals are also utilized.

9. __________ is required for complete mineralization of hazardous waste.
a) Metabolic interaction
b) Chemical analysis
c) Recalcitrant
d) Toxic removal
View Answer

Answer: a
Explanation: Metabolic interaction among groups of microorganisms is required for complete mineralization of hazardous waste.
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Sanfoundry Global Education & Learning Series – Hazardous Waste Management.

To practice all areas of Hazardous Waste Management, here is complete set of 1000+ Multiple Choice Questions and Answers.

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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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