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The wastewater form a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the dissolved oxygen of the river water
- a)is lowest at the locations S.
- b)is lowest at a point upstream of the location S.
- c)remains constant all along the length of the river.
- d)is lowest at a point downstream of the location S.
Correct answer is option 'D'. Can you explain this answer?
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The wastewater form a city, containing a high concentration of biodegr...
The dissolved oxygen (DO) level in river water is an important parameter that indicates the water's ability to support aquatic life. In the given scenario, the wastewater from a city, containing a high concentration of biodegradable organics, is being discharged into a flowing river at a location S. We need to determine the effect of this discharge on the DO level in the river water.
Effect of Wastewater Discharge on Dissolved Oxygen Levels:
1. Aerobic Degradation: When the wastewater is discharged into the river, the biodegradable organics start to decompose. This decomposition process consumes oxygen from the water, leading to a decrease in the DO level.
2. Rate of Aeration: Aeration refers to the process by which oxygen from the atmosphere is dissolved into the water. If the rate of aeration is lower than the rate of degradation of the organics, the DO level will continue to decrease.
3. Oxygen Demand: The high concentration of biodegradable organics in the wastewater results in a high oxygen demand during decomposition. As a result, the DO level in the river water will decrease significantly.
4. Downstream Impact: As the river water flows downstream from the point of discharge (location S), the degradation of organics and oxygen consumption continue. Therefore, the DO level is expected to be lowest at a point downstream of location S.
Explanation of Correct Answer:
Option D states that the dissolved oxygen is lowest at a point downstream of the location S. This is the correct answer because the degradation of organics and oxygen consumption continue as the river water flows downstream. The rate of aeration is lower than the rate of degradation, resulting in a continuous decrease in the DO level. Hence, the lowest DO level will be observed downstream of the discharge point.
Options A, B, and C are incorrect:
- Option A states that the dissolved oxygen is lowest at the location S. This is incorrect because the highest oxygen demand occurs at the discharge point, leading to a decrease in DO levels immediately after the discharge. However, as the water flows downstream, the oxygen demand and degradation continue, resulting in even lower DO levels.
- Option B states that the dissolved oxygen is lowest at a point upstream of the location S. This is incorrect because the wastewater discharge is occurring at location S. Therefore, the downstream direction is where the highest oxygen demand and degradation occur.
- Option C states that the dissolved oxygen remains constant all along the length of the river. This is incorrect because the degradation of organics and oxygen consumption continue as the water flows downstream, resulting in a decrease in the DO level.
Effect of Wastewater Discharge on Dissolved Oxygen Levels:
1. Aerobic Degradation: When the wastewater is discharged into the river, the biodegradable organics start to decompose. This decomposition process consumes oxygen from the water, leading to a decrease in the DO level.
2. Rate of Aeration: Aeration refers to the process by which oxygen from the atmosphere is dissolved into the water. If the rate of aeration is lower than the rate of degradation of the organics, the DO level will continue to decrease.
3. Oxygen Demand: The high concentration of biodegradable organics in the wastewater results in a high oxygen demand during decomposition. As a result, the DO level in the river water will decrease significantly.
4. Downstream Impact: As the river water flows downstream from the point of discharge (location S), the degradation of organics and oxygen consumption continue. Therefore, the DO level is expected to be lowest at a point downstream of location S.
Explanation of Correct Answer:
Option D states that the dissolved oxygen is lowest at a point downstream of the location S. This is the correct answer because the degradation of organics and oxygen consumption continue as the river water flows downstream. The rate of aeration is lower than the rate of degradation, resulting in a continuous decrease in the DO level. Hence, the lowest DO level will be observed downstream of the discharge point.
Options A, B, and C are incorrect:
- Option A states that the dissolved oxygen is lowest at the location S. This is incorrect because the highest oxygen demand occurs at the discharge point, leading to a decrease in DO levels immediately after the discharge. However, as the water flows downstream, the oxygen demand and degradation continue, resulting in even lower DO levels.
- Option B states that the dissolved oxygen is lowest at a point upstream of the location S. This is incorrect because the wastewater discharge is occurring at location S. Therefore, the downstream direction is where the highest oxygen demand and degradation occur.
- Option C states that the dissolved oxygen remains constant all along the length of the river. This is incorrect because the degradation of organics and oxygen consumption continue as the water flows downstream, resulting in a decrease in the DO level.
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The wastewater form a city, containing a high concentration of biodegr...
At point S where the biodegradable matter is dumped we have dissolved oxygen equal to Max but the reaction of do starts at a point after the point of application so do(dissolved oxygen ) will be lowest at downstream of point s
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The wastewater form a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the dissolved oxygen of the river water a)is lowest at the locations S. b)is lowest at a point upstream of the location S. c)remains constant all along the length of the river. d)is lowest at a point downstream of the location S.Correct answer is option 'D'. Can you explain this answer?
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The wastewater form a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the dissolved oxygen of the river water a)is lowest at the locations S. b)is lowest at a point upstream of the location S. c)remains constant all along the length of the river. d)is lowest at a point downstream of the location S.Correct answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about The wastewater form a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the dissolved oxygen of the river water a)is lowest at the locations S. b)is lowest at a point upstream of the location S. c)remains constant all along the length of the river. d)is lowest at a point downstream of the location S.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The wastewater form a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the dissolved oxygen of the river water a)is lowest at the locations S. b)is lowest at a point upstream of the location S. c)remains constant all along the length of the river. d)is lowest at a point downstream of the location S.Correct answer is option 'D'. Can you explain this answer?.
The wastewater form a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the dissolved oxygen of the river water a)is lowest at the locations S. b)is lowest at a point upstream of the location S. c)remains constant all along the length of the river. d)is lowest at a point downstream of the location S.Correct answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about The wastewater form a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the dissolved oxygen of the river water a)is lowest at the locations S. b)is lowest at a point upstream of the location S. c)remains constant all along the length of the river. d)is lowest at a point downstream of the location S.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The wastewater form a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the dissolved oxygen of the river water a)is lowest at the locations S. b)is lowest at a point upstream of the location S. c)remains constant all along the length of the river. d)is lowest at a point downstream of the location S.Correct answer is option 'D'. Can you explain this answer?.
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ample number of questions to practice The wastewater form a city, containing a high concentration of biodegradable organics, is being steadily discharged into a flowing river at a location S. If the rate of aeration of the river water is lower than the rate of degradation of the organics, then the dissolved oxygen of the river water a)is lowest at the locations S. b)is lowest at a point upstream of the location S. c)remains constant all along the length of the river. d)is lowest at a point downstream of the location S.Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice GATE tests.
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