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The following zones are formed in a polluted river under the self – purification process
- zone of clear water
- zone of active decomposition
- zone of recovery
- zone of pollution
The correct sequence in which these zones occur progressively downstream in a polluted river is:
- a)4, 2, 1, 3
- b)4, 2, 3, 1
- c)2, 4, 3, 1
- d)2, 4, 1, 3
Correct answer is option 'B'. Can you explain this answer?
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The following zones are formed in a polluted river under the self &nda...
Purification process:
1. Decomposition Zone: This is the initial zone where organic matter and pollutants enter the river. Bacteria and other microorganisms break down the organic matter through the process of decomposition. This zone is characterized by high levels of organic pollutants and low oxygen levels.
2. Oxidation Zone: As the decomposition process continues, oxygen is needed by the microorganisms. In this zone, oxygen is introduced into the water through diffusion from the atmosphere and from plants. This zone has higher oxygen levels compared to the decomposition zone, allowing for the growth of aerobic bacteria. These bacteria further break down organic pollutants and help in purifying the water.
3. Transition Zone: In this zone, the concentration of pollutants starts to decrease, and the water quality gradually improves. The transition zone marks the shift from highly polluted water to a more purified state. The oxygen levels continue to increase, supporting the growth of more diverse aquatic life.
4. Clean Zone: This is the final zone where the water is considered to be relatively clean. The concentration of pollutants is significantly reduced, and the water quality meets the required standards for aquatic life. This zone is characterized by high oxygen levels, diverse aquatic flora and fauna, and a balanced ecosystem.
It is important to note that the formation and extent of these zones depend on various factors such as the type and concentration of pollutants, the flow rate of the river, the presence of plants and other organisms, and the overall health of the ecosystem.
1. Decomposition Zone: This is the initial zone where organic matter and pollutants enter the river. Bacteria and other microorganisms break down the organic matter through the process of decomposition. This zone is characterized by high levels of organic pollutants and low oxygen levels.
2. Oxidation Zone: As the decomposition process continues, oxygen is needed by the microorganisms. In this zone, oxygen is introduced into the water through diffusion from the atmosphere and from plants. This zone has higher oxygen levels compared to the decomposition zone, allowing for the growth of aerobic bacteria. These bacteria further break down organic pollutants and help in purifying the water.
3. Transition Zone: In this zone, the concentration of pollutants starts to decrease, and the water quality gradually improves. The transition zone marks the shift from highly polluted water to a more purified state. The oxygen levels continue to increase, supporting the growth of more diverse aquatic life.
4. Clean Zone: This is the final zone where the water is considered to be relatively clean. The concentration of pollutants is significantly reduced, and the water quality meets the required standards for aquatic life. This zone is characterized by high oxygen levels, diverse aquatic flora and fauna, and a balanced ecosystem.
It is important to note that the formation and extent of these zones depend on various factors such as the type and concentration of pollutants, the flow rate of the river, the presence of plants and other organisms, and the overall health of the ecosystem.
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The following zones are formed in a polluted river under the self &nda...
Correct order is
Zone A – Zone of clear water
Zone B – Zone of Degradation
Zone C – Zone of Active decomposition
Zone D – Zone of Recovery
Zone E – Zone of clear water
ZONES OF POLLUTION:
A polluted stream undergoing self-purification presents the following four distinct zones of pollution.
A polluted stream undergoing self-purification presents the following four distinct zones of pollution.
- ZONES OF DEGRADATION:
- This usually occurs below the output sewer when discharging its contents into the stream. The zone is characterized by water becoming dark and turbid with the formation of sludge deposits on the bottom.
- Dissolved oxygen gets reduced to 40%.
- ZONES OF ACTIVE DECOMPOSITION:
- This is marked by heavy pollution. It is characterized by the absence of dissolved oxygen; water is grayish and darker with active anaerobic organic decomposition accompanying and with the evolution of methane (CH4), Hydrogen sulphide (H2S), Carbon dioxide (CO2), and Nitrogen (N2), bubbling to the surface with masses of sludge forming black scum.
- Fish life is practically absent, fungi and bacteria disappear. As the organic decomposition slackens, reaction sets in, and D.O. again rises to its original level (i.e. 40%).
- ZONE OF RECOVERY:
- In this zone, the stream tries to recover its former appearance. Most of the organic matter has been settled as sludge, B.O.D. falls and the D.O. content rises above 40% microscopic aquatic life reappears.
- Water becomes clearer, fungi decrease and algae reappear. Mineralization is active and products such as nitrates, sulphates, and carbonates are formed.
- CLEAR WATER ZONE:
- In this, the natural stream condition is restored, the D.O. is higher than the BOD. Oxygen balance is attained and recovery is said to be complete. Water becomes attractive in appearance. Some pathogenic organisms may, however, be present.
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The following zones are formed in a polluted river under the self – purification process zone of clear water zone of active decomposition zone of recovery zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river is:a)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer?
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The following zones are formed in a polluted river under the self – purification process zone of clear water zone of active decomposition zone of recovery zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river is:a)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The following zones are formed in a polluted river under the self – purification process zone of clear water zone of active decomposition zone of recovery zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river is:a)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The following zones are formed in a polluted river under the self – purification process zone of clear water zone of active decomposition zone of recovery zone of pollutionThe correct sequence in which these zones occur progressively downstream in a polluted river is:a)4, 2, 1, 3b)4, 2, 3, 1c)2, 4, 3, 1d)2, 4, 1, 3Correct answer is option 'B'. Can you explain this answer?.
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