What Is Sewage and Its Effects

Q.

What is sewage? In which way can sewage be harmful to us?

Q.

What is the 3R approach?

1. Reduce, Remove and Reuse

2. Reuse, Replenish and Remove

3. Reduce, Remove and Replenish

4. Reduce, Reuse and Recycle

Q.

What is sewage? In which way can sewage be harmful to us?

Q.

In secondary treatment sewage, water is treated with __________.

1. anaerobic bacteria

2. biogas

3. ammonia

4. oxygen

Q. What would happen if oxygen availability to activated sludge flocs is reduced?

1. It will slow down the rate of degradation of organic matter
2. Flocs would increase in size as anaerobic bacteria would grow around flocs
3. Protozoa would grow in large numbers
4. None of these

Q. Assertion :Secondary treatment of sewage is also called biological treatment while primary treatment is called physical treatment. Reason: Primary sewage treatment depends only upon sedimentation properties of materials present in sewage and filtration.

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

Q. The e-wastes generated in the developed countries are exported to the developing countries because:

1. Developing countries do not have proper recycling facilities
2. Developed countries use manual labour to recycle e-wastes
3. Developing countries extract expensive metals from the e-wastes and recycle them
4. Developed countries do not have proper recycling facilities

Q. Waste water treatment generates a large amount of sludge, which can be treated by

1. Floc
2. Anaerobic digesters
3. Chemicals
4. Oxidation pond

Q. What is sludge?

Q.

Sewage pollutes ___________.

1. Soil

2. Air

3. Water

4. Sea

Q.

What is the first stage in the bio decomposition in the anaerobic digester?

Q. Choose the correct option indicating decrease in the BOD of given samples of water.

1. Untreated sewage $\to$ Treated sewage $\to$ River water $\to$ Drinking water
2. Untreated sewage $\to$ Treated sewage $\to$ River water $\to$ Drinking water
3. Untreated sewage $\to$ Treated sewage $\to$ Drinking water $\to$ River water
4. Untreated sewage = Treated sewage $\to$ River water $\to$ Drinking water

Q. What will be the effect on treatment of sewage if microbes are removed from
it ? Clarify.

Q. What happens when activated sludge is pumped into aerobic digester?

Q. Wastewater treatment generates a large quantity of sludge, which can be treated by:

1. anaerobic digesters
2. floc
3. chemicals
4. oxidation pond

Q. Describe the role of microbes in sewage treatment plant.

Q. 'Flocs' is?

1. Primary sludge produced in sewage treatment
2. A type of biofortified food
3. A mesh like structure formed by association of bacteria and fungal filaments in sewage treatment
4. The effluent in primary treatment tank obtained during sewage treatment

Q.

When is the sewage water treated?

Q. Justify the statement 'Natural aging of a lake by nutrient enrichment of its water'.

Q. In the waste water treatment plant (WWTP) air is pumped into water to

1. Support the growth of anaerobic bacteria
2. Support the growth of aerobic bacteria
3. Blow human waste
4. Disinfect water

Q. Sewage sludge is used as a

1. Manure
2. Biogas generator
3. Tipping
   
4. Both A and B
   

Q. List various stages of sewage treatment.

Q. The magnitude of BOD of wastewater describes ?

1. Bacterial count
2. Amount of organic material
3. Amount of inorganic material
4. All of the above

Q. Which of the following is present in activated sludge?

1. Yeast
2. Bacteria
3. Protozoa
4. All of the above

Q.

Which one of the following food items are not formed by the help of microorganisms?

1. Curd

2. Pickle

3. Bread

4. Jam

Q. Chlorination of treated waste water is required for

1. Complete breakdown of organic matter
2. Killing all microbes
3. Removing suspended materials
4. All of the above

Q. Sewage treatment in which a portion of decomposer bacteria present in waste is recycled into the beginning of the process is

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

Q. Secondary sewage treatment is mainly

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

Q. The domestic sewage in large cities

1. Is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plant (STPs)
2. Has very high amounts of suspended solids and dissolved salts
3. When treated in STPs does not really require the aeration step as the sewage contains adequate oxygen
4. Has a high BOD as it contains both aerobic and anaerobic bacteria

Q. In the treatment of waste water discharge, which treatment stage involves biological treatment?

1. Secondary treatment
2. Primary treatment
3. Tertiary treatment
4. Reservoir osmosis stage