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The period of cleaning of a slow sand filter is usually:
  • a)
    30 days to 90 days
  • b)
    120 days to 180 days
  • c)
    90 days to 120 days
  • d)
    15 days to 30 days
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The period of cleaning of a slow sand filter is usually:a)30 days to ...
Slow sand filter: They consist of fine sand, supported by gravel. They capture particles near the surface of the bed and are usually cleaned by scraping away the top layer of sand that contains the particles.
Cleaning:
  • For cleaning, the top layer of sand is scrapped and 1.5 to 3 cm of sand is removed in each cleaning.
  • The frequency of cleaning is 1 to 3 months.
  • The rate of filtration is 100-200 l/hr/m2 of filter area.
  • It is used for smaller plants in villages.
Rapid sand Filter: They consist of larger sand grains supported by gravel and capture particles throughout the bed. They are cleaned by backwashing water through the bed to 'lift out' the particles.
Cleaning:
  1. Cleaning of the filter can also be done using surface wash but it should be accompanied by backwash.
  2. Washing period = 24 to 48 hrs.
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The period of cleaning of a slow sand filter is usually:a)30 days to ...
Period of Cleaning of Slow Sand Filter

Slow sand filters are a type of water treatment system that uses biological and physical processes to remove impurities from water. These filters are commonly used in water treatment plants, as well as in homes and businesses that rely on well water. One of the key factors in the effectiveness of a slow sand filter is the period of cleaning.

Period of Cleaning: 30 days to 90 days

The period of cleaning of a slow sand filter typically ranges from 30 days to 90 days. During this time, the filter is able to effectively remove impurities from the water without becoming clogged or overloaded. However, if the filter is not cleaned regularly, it can become less effective and may even pose a health risk.

Importance of Regular Cleaning

Regular cleaning of a slow sand filter is essential for maintaining its effectiveness and ensuring the safety of the water supply. Over time, the filter can become clogged with debris and bacteria, reducing its ability to remove impurities from the water. This can lead to a buildup of harmful pathogens, such as E. coli and giardia, which can cause illness if ingested.

Cleaning Process

The cleaning process for a slow sand filter typically involves removing the top layer of sand and cleaning it thoroughly before replacing it. This can be done manually or with the help of specialized equipment, depending on the size of the filter and the amount of sand that needs to be removed. In some cases, the entire filter may need to be drained and cleaned to remove any buildup of sediment or organic matter.

Conclusion

In conclusion, the period of cleaning of a slow sand filter is an important factor in maintaining the effectiveness and safety of the water supply. Regular cleaning, typically every 30 to 90 days, is essential for preventing the buildup of harmful pathogens and ensuring that the filter is able to remove impurities from the water effectively.
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The period of cleaning of a slow sand filter is usually:a)30 days to 90 daysb)120 days to 180 daysc)90 days to 120 daysd)15 days to 30 daysCorrect answer is option 'A'. Can you explain this answer?
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