This set of Environmental Biotechnology Interview Questions and Answers for Experienced people focuses on “Biological Treatment of Waste Water – Nutrient Removal through Biomass Production”.
1. Which of the following method can be used to treat crude sewage and nitrify secondary effluent?
a) Duck weed ponds
b) Reed beds
c) Algal fish ponds
d) Water hyacinth pond
View Answer
Explanation: Reed beds are a part of a succession from young reeds which colonize open water and can be used to treat liquid effluent, Water hyacinth pond is used for secondary and tertiary treatment, Algal fish ponds is used to increase the quality of water, Duck weed ponds convert organic pollutants in fish biomass.
2. Duck weed can grow profusely in nutrient rich waste water.
a) True
b) False
View Answer
Explanation: Duck weeds grow profusely wherever there is nutrient rich waste water and they have higher nutrient harvesting efficiency and rapid growth properties.
3. Which of the following methods can be used to convert organic pollutants into fish biomass?
a) Duck weed ponds
b) Reed beds
c) Algal fish ponds
d) Water hyacinth pond
View Answer
Explanation: Duck weed ponds grow profusely wherever there is nutrient rich waste water and they have higher nutrient harvesting efficiency and rapid growth properties, thereby organic and nutrient load in the waste water by syntrophic interactions and convert organic pollutants in fish biomass, Reed beds are a part of a succession from young reeds which colonize open water and can be used to treat liquid effluent, Water hyacinth pond is used for secondary and tertiary treatment, Algal fish ponds is used to increase the quality of water.
4. The bacterial biofilms and floating weeds interact in duckweed ponds resulting in decrease of nutrient load and _______ in waste water.
a) Organic pollutant
b) Fish biomass
c) Oxygen
d) Water
View Answer
Explanation: Organic pollutant being more persistent in the environment can be effectively removed by various biological processes, duck weed ponds having high nutrient harvesting efficiency and rapid growth properties convert these organic and nutrient load in the waste water by syntrophic interactions of floating weeds and biofilms which are suspended in waste water which convert organic pollutants into fish biomass, so, it doesn’t decrease the fish biomass, Oxygen is required for oxidation process and water is not decreased.
5. The hollow rhizomes of the reeds generate a hydraulic pathway thereby treating sewage by ___________
a) Flocculation
b) Bacterial activity
c) Precipitation
d) Sedimentation
View Answer
Explanation: The hollow rhizomes of the reeds that grow from the growth nodes, generate a hydraulic pathway thereby treating sewage using the colonized rhizosphere bacteria and rhizomes in the root tips, hence, it uses bacterial activity and Precipitation and Sedimentation is the general method by which the particles sediments at the bottom or precipitation by which particles precipitates, Flocculation is a process in which colloids get suspended in the form of flocs.
6. Which of the following factors doesn’t need to be considered in order to make the system of nutrient removal cost effective?
a) Waste water type
b) Space
c) Production rate
d) Water volume
View Answer
Explanation: Waste water type determination helps to determine the type of treatment, space is required to ensure that proper area is available for efficient treatment and production rate is important in order to make the system cost effective, whereas, water volume is not a major concern because any volume of water can be and should be treated and it doesn’t affect the cost.
7. __________ method can be used for enhancing the performance of waste stabilization ponds.
a) Water hyacinth pond
b) Reed beds
c) Duck weed ponds
d) Algal fish ponds
View Answer
Explanation: Water hyacinth pond is used for secondary and tertiary treatment of waste water, removing organic matter and suspended solids, and hence, enhances the performance of waste stabilization ponds, Reed beds are a part of a succession from young reeds which colonize open water and can be used to treat liquid effluent, Algal fish ponds is used to increase the quality of water, Duck weed ponds convert organic pollutants in fish biomass.
8. Algal fish ponds require artificial aeration.
a) True
b) False
View Answer
Explanation: Algal fish ponds removes Nutrients, stabilizing pH, which increases the concentration of dissolved oxygen and hence, there is no requirement of artificial aeration.
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