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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Q. What is the temperature at which the denitrification process takes place when it is carried out in a fluidised bed reactor?

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Q. Ammonia stripping is done to increase ammonia content.

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Q. What is the limit of ammonia content for which ammonia stripping is suited?

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Q. Above pH 7, ammonia will be in the form of soluble ammonia ions.

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Q. What is the state of ammonia above a pH of 12?

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Q. Percentage of dissolved gas ________ with temperature and pH.

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Q. The higher the temperature, the lower the________

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Q. Which of the below factors do not favour high efficiency?

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Q. What is the most favourable pH for the operation?

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Q. Which of the following is an advantage of closed loop?

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