250+ TOP MCQs on Nitrogen Removal During Wastewater Treatment

Environmental Biotechnology Multiple Choice Questions on “Nitrogen Removal During Wastewater Treatment”.

1. Nitrogen and __________ are the main source for eutrophication of surface water?
a) Phosphorus
b) Potassium
c) Calcium
d) Magnesium

Answer: a
Clarification: Nitrogen and phosphorus is majorly responsible for Eutrophication which leads to hypoxic conditions in water leading to algal blooms, whereas, Calcium, potassium and magnesium are the basic nutrients and minerals available in the environment not leading to eutrophication.

2. Ammonia is converted into nitrate which is converted into__________ and released into the atmosphere.
a) Nitrogen gas
b) Nitrate
c) Sulphate
d) Carbon dioxide

Answer: a
Clarification: Ammonia is converted into nitrate by the process of nitrification which is converted into nitrogen gas by the process of denitrification and released into the atmosphere, nitrate cannot be converted into nitrate again, sulphate group and carbon dioxide is not released in this process.

3. Which of the following process is leads to removal of nitrogen gas from water?
a) Nitrification
b) Ammonification
c) Denitrification
d) Desalination

Answer: c
Clarification: Removal of nitrogen gas from waste water i.e. the final step is called as denitrification, ammonification is conversion into ammonia, nitrification is conversion into nitrate and denitrification is conversion of nitrate and for the complete removal of nitrogen into atmosphere denitrification step is followed which would otherwise lead to eutrophication, desalination is a procedure by which salt is removed from water bodies, this step is not followed for nitrogen removal.

4. The total Nitrogen load = (soluble organic nitrogen and ammonia from incoming wastewater) + (nitrogen from Return Activated Sludge) + (nitrogen from recirculation).
a) True
b) False

Answer: a
Clarification: The total Nitrogen load in the sludge process is the summation of the organic nitrogen and ammonia contributed by the incoming wastewater, nitrogen from by the return Activated Sludge and nitrogen from any recirculation nitrification stages during the treatment process.

5. Particulate organic nitrogen is termed as the material that can pass through a 0.2-μm filter.
a) True
b) False

Answer: b
Clarification: Dissolved organic nitrogen is termed as the material that can pass a 0.2-μm filter, while Particulate organic nitrogen is termed as the material that is retained on the filter.