Steps in Primary Treatment

Q.

How many stages does a sewage treatment plant have?

Q. Which of the following is the first step in sewage treatment?

1. Sedimentation
2. Filtration
3. Flocculation
4. None of the above

Q.

FOAM and the biologists from Humboldt state university, California created an integrated wastewater treatment, they use plants to purify mainly :-

1. Sludge from water.

2. Heavy metals from water.

3. Nitrate and Phosphate from water.

4. All of the above.

Q. Which portion of sewage from primary treatment is taken for secondary treatment?

1. Primary sludge
2. Effluent
3. Floating debris
4. Flocs

Q. Secondary treatment of sewage:

1. Is physical process
2. Involves aeration tank and anaerobic sludge digester
3. Produces primary sludge
4. Removes floating debris

Q. Which of the following in sewage treatment removes suspended solids ?

1. Primary treatment
2. Sludge treatment
3. Tertiary treatment
4. Secondary treatment

Q.

Three statements are provided here which define the terms. Pick out the correct definition for each of these terms.

Column 1	Column 2
Sludge	The settled solids that are removed in wastewater treatment with a scraper
Sewage	Water from the kitchen used for washing dishes
Wastewater	Wastewater is released from homes, industries, hospitals, and other public buildings.

Q. Assertion: During secondary treatment of sewage, the primary effluent is passed into large settling tanks and is constantly agitated mechanically and air is pumped into it.
Reason: This allows the vigorous growth of the useful anaerobic microbes.

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

Q.

what is primary sludge?

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

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

Q. Select the option that has the correct sequence of the various steps involved during the treatment of waste water.

1. Breakdown of the organic matter→Bacterial flocs sediment →Sequential filtration and sedimentation →Effluent released into the water bodies
2. Breakdown of the organic matter→Sequential filtration and sedimentation →Bacterial flocs sediment →Effluent released into the water bodies
3. Sequential filtration and sedimentation →Breakdown of the organic matter→Bacterial flocs sediment→Effluent released into the water bodies
4. Bacterial flocs sediment→Sequential filtration and sedimentation →Breakdown of the organic matter→Effluent released into the water bodies

Q.

Physical removal of large and small particles from the sewage through filtration and sedimentation is called:

1. hlorinaiton

2. anaerobic sludge digestion

3. primary treatment

4. secondary treatment

Q. After the secondary treatment of sewage, the effluent produced is released into the ______.

1. settling tanks
2. filtration units
3. digester tanks
4. water bodies

Q. How do microbes help in the secondary treatment of sewage?

1. The aerobic microbes breakdown the organic matter in the sewage
2. The anaerobic microbes kill the pathogens present in the sewage
3. The anaerobic microbes breakdown the organic matter in the sewage to produce biogas
4. The aerobic microbes breakdown the organic matter in the sewage to produce biogas

Q. The primary treatment of sewage is a ___i____ process while the secondary stage of treatment is ___ii____.

1. i - mechanical, ii - physical
2. i - physical, ii - biological
3. i - biological, ii - mechanical
4. i - biological, ii - physical

Q. Physical removal of particles from the sewage takes place in which of the following treatments?

1. Primary treatment
2. Anaerobic digestion of the activated sludge
3. Secondary treatment
4. Both primary and secondary treatments