Q. What is the main function of a trickling filter in wastewater treatment?
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A.
To aerate the water
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B.
To remove solids
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C.
To promote microbial growth
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D.
To disinfect the effluent
Solution
The main function of a trickling filter is to promote microbial growth on the filter media, which helps in the breakdown of organic matter.
Correct Answer:
C
— To promote microbial growth
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Q. What is the primary goal of secondary treatment in wastewater management?
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A.
To remove nutrients
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B.
To reduce biochemical oxygen demand (BOD)
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C.
To disinfect the effluent
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D.
To remove heavy metals
Solution
The primary goal of secondary treatment is to reduce biochemical oxygen demand (BOD) by degrading organic matter through microbial activity.
Correct Answer:
B
— To reduce biochemical oxygen demand (BOD)
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Q. What is the primary purpose of wastewater treatment?
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A.
To remove pathogens and pollutants
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B.
To increase nutrient levels
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C.
To enhance water color
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D.
To promote algae growth
Solution
The primary purpose of wastewater treatment is to remove pathogens and pollutants to protect public health and the environment.
Correct Answer:
A
— To remove pathogens and pollutants
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Q. What is the role of anaerobic bacteria in wastewater treatment?
-
A.
To oxidize organic matter
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B.
To produce methane
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C.
To filter solids
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D.
To remove heavy metals
Solution
Anaerobic bacteria play a crucial role in wastewater treatment by breaking down organic matter and producing methane in the absence of oxygen.
Correct Answer:
B
— To produce methane
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Q. What type of bacteria are primarily responsible for nitrification in wastewater treatment?
-
A.
Facultative anaerobes
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B.
Obligate aerobes
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C.
Anaerobes
-
D.
Fermenters
Solution
Obligate aerobes are primarily responsible for nitrification, a process that converts ammonia to nitrate in wastewater treatment.
Correct Answer:
B
— Obligate aerobes
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Q. Which microorganism is commonly used in the biological treatment of wastewater?
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A.
Escherichia coli
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B.
Bacillus subtilis
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C.
Pseudomonas aeruginosa
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D.
Activated sludge bacteria
Solution
Activated sludge bacteria are commonly used in the biological treatment of wastewater due to their ability to degrade organic matter.
Correct Answer:
D
— Activated sludge bacteria
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Q. Which microorganism is often associated with the treatment of high-strength industrial wastewater?
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A.
Lactobacillus
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B.
Methanogens
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C.
Streptococcus
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D.
Bifidobacterium
Solution
Methanogens are often associated with the treatment of high-strength industrial wastewater, particularly in anaerobic digestion processes.
Correct Answer:
B
— Methanogens
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Q. Which of the following is a common indicator organism for fecal contamination in water?
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A.
Salmonella
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B.
E. coli
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C.
Staphylococcus aureus
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D.
Clostridium perfringens
Solution
E. coli is a common indicator organism used to assess fecal contamination in water, indicating the presence of pathogens.
Correct Answer:
B
— E. coli
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Q. Which of the following is a disadvantage of using chlorine for disinfection in wastewater treatment?
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A.
It is ineffective against all pathogens
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B.
It can form harmful byproducts
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C.
It is too expensive
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D.
It requires special equipment
Solution
A disadvantage of using chlorine for disinfection is that it can form harmful byproducts, such as trihalomethanes, which are toxic.
Correct Answer:
B
— It can form harmful byproducts
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Q. Which process is primarily used to remove suspended solids from wastewater?
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A.
Sedimentation
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B.
Filtration
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C.
Chlorination
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D.
Aeration
Solution
Sedimentation is primarily used to remove suspended solids from wastewater by allowing them to settle at the bottom of a tank.
Correct Answer:
A
— Sedimentation
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