Process of Wastewater Treatment

Q. Which of the following is pumped into anaerobic sludge digesters during the sewage treatment?

1. Primary sludge
2. Floating debris
3. Effluent of primary treatment
4. Activated sludge

Q.

Besides better aeration and mixing properties, what other advantages do stirred tank bioreactors have over shake flasks?

Q. Assertion: Agroecosystem is a man-made and a stable ecosystem.

Reason: Agroecosystem is less efficient in terms of productivity.

1. Both the assertion and reason are true and the reason is the correct explanation of the assertion
2. Both the assertion and reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false
4. Both the assertion and reason are false

Q. Stirred-Tank bioreactors have been designed for

1. Addition of preservatives to the product
2. Purification of the product
3. Ensuring anaerobic conditions in the culture vessel
4. Availability of oxygen throughout the process

Q. Secondary sewage treatment is mainly a

1. Chemical process
2. Biological process
3. Physical process
4. Mechanical process

Q. The sewage treatment process in which a portion of the decomposer bacteria present in the waste is recycled and reused in the beginning of the next round of the process is called

1. Cyclic treatment
2. Primary treatment
3. Activated sludge treatment
4. Tertiary treatment

Q. A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called as:

1. primary treatment
2. tertiary treatment
3. activated sludge treatment
4. none of these.

Q. The sewage treatment process in which a portion of the decomposer bacteria present in the waste is recycled and reused in the beginning of the next round of the process is called

1. Cyclic treatment
2. Primary treatment
3. Activated sludge treatment
4. Tertiary treatment

Q. The sewage treatment process in which a portion of the decomposer bacteria present in the waste is recycled and reused in the beginning of the next round of the process is called

1. Cyclic treatment
2. Primary treatment
3. Activated sludge treatment
4. Tertiary treatment

Q. Which one of the following is not used for disinfection of drinking water?

1. Chlorine
2. Ozone
3. Chloramine
4. Phenyl

Q. Secondary sewage treatment is mainly a

1. Mechanical process
2. Chemical process
3. Biological process
4. Physical process

Q. Stirred-Tank bioreactors have been designed for

1. Addition of preservatives to the product
2. Purification of the product
3. Ensuring anaerobic conditions in the culture vessel
4. Availability of oxygen throughout the process