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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Q. In which stage are the aeration and mixing avoided?

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Q. The multiplication of _________ is encouraged by the addition of oxygen.

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Q. ______ is used to remove phosphorus compounds from the liquor.

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Q. The _________ is usually the same length in time as the aeration.

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Q. Which part of the tank is suitable for anaerobic bacteria to flourish?

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Q. ______ is removed by Anammox.

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