Aerobic Systems - Hazardous Waste Management Questions and Answers

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).

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.

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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