This set of Environmental Biotechnology Multiple Choice Questions & Answers (MCQs) focuses on “Wastewater Treatment Systems – Enhanced Biological Phosphate Removal”.
1. Sewage treatment plant for the removal of phosphate in an activated sludge system is called as ________
a) Enhanced biological phosphorus removal
b) Enhanced biological Nitrogen removal
c) Enhanced potassium removal
d) Enhanced nitrogen removal
View Answer
Explanation: Sewage treatment operations in a plant to remove phosphate in an activated sludge system is called as Enhanced biological phosphorus removal in absence of nitrate and oxygen prior to aeration, Enhanced potassium removal is not preferred in an activated sludge, enhanced biological nitrogen removal is done through multiple nitrification and denitrification stages, aeration process is called as enhanced nitrogen removal process.
2. Enhanced biological phosphorus removal implementation is done in an anaerobic tank.
a) True
b) False
View Answer
Explanation: Enhanced biological phosphorus removal implementation is done in an anaerobic tank, phosphorus removal is done in absence of nitrate and oxygen prior to aeration.
3. The removal of phosphorous from wastewater involves the unification of __________ and then removal from the solids?
a) Phosphate into TSS
b) Ammonification
c) Denitrification
d) Desalination
View Answer
Explanation: The phosphate removal from wastewater involves the unification of Phosphate into TSS into the waste water, i.e. phosphate to merge with the total suspended solids and then it’s removal from the solids, removal of nitrogen gas from waste water i.e. the final step is called as denitrification, ammonification is conversion into ammonia, desalination is a procedure by which salt is removed from water bodies, this step is not followed for nitrogen removal.
4. Which of the following adding would to remove the inorganic forms of phosphate?
a) Coagulant
b) Fertilizer
c) Heavy metals
d) Uranium
View Answer
Explanation: Coagulant and waste water mixed together can be used to remove the inorganic forms of phosphate by process of chemical precipitation, fertilizer is used for crops in agricultural lands, heavy metals and uranium, both are toxic if mixed in the waste water.
5. The total fraction from COD that can be biodegraded by microorganisms is rbCOD.
a) True
b) False
View Answer
Explanation: The heterotrophic microorganisms can degrade the total fractions from COD and biodegraded them into smaller fractions is known as rbCOD.
6. ______________ causes sun block and prevent from reaching lower waters.
a) Algal blooms
b) Plants
c) Aquatic animals
d) Algae
View Answer
Explanation: Phosphorus in water from runoff lands, or from leaching through soil from fertilizers and sewage discharges where the phosphorus content is too high, it can trigger algal blooms resulting in eutrophication which would eventually block the sunlight from reaching lower waters leading to the death of the plants, plants, aquatic animals do not block the sunlight, whereas, algae helps in photosynthesis.
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