- 1(current)
Q. No.Waste water treatment generates a large quantity of sludge, which can be treated by
1. anaerobic digesters
2. floc
3. chemicals
4. oxidation pond
Methanogenic bacteria are not found in
1. rumen of cattle
2. gobar gas plant
3. bottom of water-logged paddy fields
4. activated sludge
The primary treatment of waste water involves the removal of
1. dissolved impurities
2. stable particles
3. toxic substances
4. harmful bacteria
BOD of waste water is estimated by measuring the amount of
1. total organic matter
2. biodegradable organic matter
3. oxygen evolution
4. oxygen consumption
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. | The center of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs. |
| 3. | Floes would increase in size as anaerobic bacteria would grow around floes. |
| 4. | Protozoa would grow in large numbers. |
Activated sludge should have the ability to settle quickly so that it can
| 1. | be rapidly pumped back from the sedimentation tank to the aeration tank |
| 2. | absorb pathogenic bacteria present in wastewater while sinking to the bottom of the settling tank |
| 3. | be discarded and anaerobically digested |
| 4. | absorb colloidal organic matter |
- 1(current)
Q. No.
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