Q. ________ is treated in activated sludge reactor.

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Q. After the treatment, the BOD demand ______

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Q. Which is the next reactor after activated sludge reactor in the treatment process?

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Q. Where is the sludge at the bottom of the clarifier processed to?

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Q. Which of these is not an alternative to activated sludge treatment systems?

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Q. An activated sludge system consists of two components, an aerator and ________

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Q. How is air pumped in the aerator unit?

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Q. Which are the three ingredients in activated sludge systems?

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Q. Mechanical stirring can be done instead of injection of air from the bottom.

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Q. The sludge particles concentration is increased by the growth of the organism in aeration tanks.

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Q. The organisms feed on _____ in aeration tanks.

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Q. Calculate the volume of the aeration tank required for the following data:

Flow: 800 m³/d
BOD: 1000 mg/L
F/M ratio: 0.15(extended aeration)
MLSS: 3500 mg/L

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Q. Sewage treatment plant is a part of secondary treatment.

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Q. Biological process is used to remove _______

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Q. What is the wastewater called as after physical and biological removal of solids?

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Q. What is the monthly concentration of solids produced by secondary sewage effluent?

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Q. What is the expected BOD removal after both primary and secondary treatment?

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Q. What is the percentage removal of BOD by stabilization ponds?

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Q. The trickling filter consists of electric systems.

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Q. Which of these is not an advantage of a trickling filter?

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