Q. While designing the aerated lagoon carried out facultatively what is the hydraulic retention time considered?

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Q. What is the minimum depth considered while designing an aerated lagoon?

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Q. Which of the following methods consume the least power?

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Q. Which of the following methods consume the most power?

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Q. The facultative pond functions like a ________

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Q. The surface area of facultative ponds should be small.

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Q. In facultative ponds, micro-organisms are able to oxidize only dissolved organics.

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Q. ______ occur when the rate of oxygen transfer from the lagoon surface is less than the rate of oxygen consumption in the lower levels of the lagoon.

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Q. How much amount of oxygen should one acre of facultative lagoon must provide per day?

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Q. ______ weather requires large oxygen transfer.

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Q. Ice mats _____ the oxygen transfer surface.

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Q. What is the depth range of facultative ponds?

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Q. What is the maximum allowable temperature in facultative ponds?

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Q. Which colour are the facultative ponds?

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Q. SBR is a type of ________

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Q. The one tank is aerating and filling while the other one is decant.

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Q. Bio-selectors direct the flow.

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Q. ___________ helps to mix the incoming influent and the returned activated sludge.

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Q. How is mixing done in SBR?

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Q. In which stage of the SBR is aeration performed?

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