Q. When is internal recirculation required for preanoxic tank?

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Q. What is the retention time considered for an anoxic zone for the removal of nitrogen for modified Ludzack Ettinger treatment system?

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Q. What is the residential time considered for the sequence batch reactor for the removal of nitrogen?

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Q. While designing SBR for the removal of nitrogen what is the MLVSS in mg/L assumed?

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Q. Nitrification is performed by a small group of _______

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Q. In nitrification, ammonia is converted to _____

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Q. Nitrate conversion takes place only through assimilatory cellular functions.

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Q. In dissimilatory denitrification, ______ serves as the electron acceptor in energy metabolism.

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Q. Microbial yield under aerobic conditions is lower than anoxic conditions.

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Q. Denitrification releases _______

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Q. How many molecules of oxygen are required for one molecule of nitrogen?

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Q. Which of the below is used to denitrify nitrates?

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Q. What is the process for converting organic-nitrogen to ammonia?

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Q. What is the minimum amount of dissolved oxygen required for nitrification?

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Q. What is the optimum pH for nitrosomonas?

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Q. What is the minimum temperature required for denitrification process?

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Q. What is the denitrification rate for the following data?

Temperature: 10 degree Celsius
Dissolved oxygen: 10 mg/L

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Q. Calculate the residence time for the following data.

Influent nitrate: 22 mg/L
Effluent nitrate: 3 mg/L
Overall denitrification rate: 0.038 per day
MLVSS: 2000 mg/L

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Q. Which of these chemicals is added in the post anoxic step?

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Q. Ammonia is converted into nitrogen by which type of bacteria in anaerobic conditions?

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