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Consider the following statement
1. Slow sand filter is not flexible in variation in demand
2. The rapid sand filter is flexible in fluctuations in demand
3. The method of cleaning of a slow sand filter involves agitation and back-washing
Which of the above statement is/are correct?
1. Slow sand filter is not flexible in variation in demand
2. The rapid sand filter is flexible in fluctuations in demand
3. The method of cleaning of a slow sand filter involves agitation and back-washing
Which of the above statement is/are correct?
- a)1, 2
- b)1, 2, 3
- c)2, 3
- d)Only 3
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Consider the following statement1. Slow sand filter is not flexible in...
Explanation: The method of cleaning of a slow sand filter involves scrapping of top layer to 15 to 25mm whereas in rapid sand filter involves agitation and back-washing.
Most Upvoted Answer
Consider the following statement1. Slow sand filter is not flexible in...
Explanation:
Statement 1: Slow sand filter is not flexible in variation in demand
This statement is correct. Slow sand filters have a fixed filtration rate, which means they have limited flexibility in handling variations in demand. The rate at which water can be filtered through a slow sand filter is determined by the size and depth of the filter bed, as well as the quality of the filter media. Therefore, slow sand filters are not able to adjust their filtration rate quickly in response to changes in demand.
Statement 2: The rapid sand filter is flexible in fluctuations in demand
This statement is incorrect. Rapid sand filters, like slow sand filters, also have a fixed filtration rate. They are not designed to handle large fluctuations in demand. However, rapid sand filters are generally able to handle variations in demand better than slow sand filters due to their higher filtration rates. The higher filtration rate allows for a greater volume of water to be filtered in a given time period, which provides some flexibility in handling fluctuations in demand. However, rapid sand filters still have limitations in their ability to respond quickly to changes in demand.
Statement 3: The method of cleaning of a slow sand filter involves agitation and back-washing
This statement is incorrect. The method of cleaning a slow sand filter does not involve agitation and back-washing. Slow sand filters rely on a biological process called biolayer formation to remove impurities from the water. The biolayer, which is a layer of microorganisms that forms on the surface of the filter media, acts as a natural filter to remove particles and pathogens from the water. Over time, the biolayer becomes clogged with impurities and needs to be cleaned. This is typically done by scraping off the top layer of the filter bed and removing the accumulated debris. Agitation and back-washing are not part of the cleaning process for a slow sand filter.
Conclusion:
Based on the above explanations, statement 1 is correct, statement 2 is incorrect, and statement 3 is incorrect. Therefore, the correct answer is option A (1, 2).
Statement 1: Slow sand filter is not flexible in variation in demand
This statement is correct. Slow sand filters have a fixed filtration rate, which means they have limited flexibility in handling variations in demand. The rate at which water can be filtered through a slow sand filter is determined by the size and depth of the filter bed, as well as the quality of the filter media. Therefore, slow sand filters are not able to adjust their filtration rate quickly in response to changes in demand.
Statement 2: The rapid sand filter is flexible in fluctuations in demand
This statement is incorrect. Rapid sand filters, like slow sand filters, also have a fixed filtration rate. They are not designed to handle large fluctuations in demand. However, rapid sand filters are generally able to handle variations in demand better than slow sand filters due to their higher filtration rates. The higher filtration rate allows for a greater volume of water to be filtered in a given time period, which provides some flexibility in handling fluctuations in demand. However, rapid sand filters still have limitations in their ability to respond quickly to changes in demand.
Statement 3: The method of cleaning of a slow sand filter involves agitation and back-washing
This statement is incorrect. The method of cleaning a slow sand filter does not involve agitation and back-washing. Slow sand filters rely on a biological process called biolayer formation to remove impurities from the water. The biolayer, which is a layer of microorganisms that forms on the surface of the filter media, acts as a natural filter to remove particles and pathogens from the water. Over time, the biolayer becomes clogged with impurities and needs to be cleaned. This is typically done by scraping off the top layer of the filter bed and removing the accumulated debris. Agitation and back-washing are not part of the cleaning process for a slow sand filter.
Conclusion:
Based on the above explanations, statement 1 is correct, statement 2 is incorrect, and statement 3 is incorrect. Therefore, the correct answer is option A (1, 2).
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Consider the following statement1. Slow sand filter is not flexible in variation in demand2. The rapid sand filter is flexible in fluctuations in demand3. The method of cleaning of a slow sand filter involves agitation and back-washingWhich of the above statement is/are correct?a)1, 2b)1, 2, 3c)2, 3d)Only 3Correct answer is option 'A'. Can you explain this answer?
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