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The disinfection efficiency of chlorine increases by:
i) decreasing the time of contact
ii) decreasing the temperature of water
iii) increasing the temperature of water
The correct answer is:
- a)only (i)
- b)Both (i) and (ii)
- c)Both (i) and (iii)
- d)only (iii)
Correct answer is option 'D'. Can you explain this answer?
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The disinfection efficiency of chlorine increases by:i) decreasing the...
At lower temperatures, bacterial kill tends to be slower and higher doses are needed. The effect of low temperatures is greater with combined chlorine than with free available chlorine.
Contact time is as important as the chlorine dose in determining the efficiency of water treatment chlorination. Contact time is the amount of time which the chlorine has to react with the microorganisms in the water, which will equal the time between the moment when chlorine is added to the water and the moment when that water is used by the consumer. The longer the contact time, the more efficient the disinfection process is. When using chlorine for disinfection a minimum contact time of 30 minutes is required for adequate disinfection.
Most Upvoted Answer
The disinfection efficiency of chlorine increases by:i) decreasing the...
The correct answer is option 'D' - only (iii) is the correct answer. Let's understand why.
Decreasing the time of contact:
- Chlorine is a powerful disinfectant and is commonly used to treat water for disinfection purposes. It works by killing or inactivating harmful bacteria, viruses, and other microorganisms that may be present in the water.
- When chlorine is added to water, it needs sufficient time to react and disinfect the water. By decreasing the time of contact, the chlorine may not have enough time to effectively kill or inactivate the microorganisms present in the water. Therefore, decreasing the time of contact will decrease the disinfection efficiency of chlorine.
Decreasing the temperature of water:
- The disinfection efficiency of chlorine is affected by the temperature of the water. Generally, higher temperatures enhance the disinfection process.
- When the water temperature is decreased, the reaction rate between chlorine and the microorganisms may slow down. This can lead to a decrease in the disinfection efficiency of chlorine.
- Additionally, lower temperatures may also affect the solubility of chlorine in water, which can further reduce its effectiveness as a disinfectant.
Increasing the temperature of water:
- Increasing the temperature of water can improve the disinfection efficiency of chlorine.
- Higher temperatures can increase the reaction rate between chlorine and the microorganisms, resulting in a more effective disinfection process.
- Moreover, increased temperatures can also enhance the solubility of chlorine in water, allowing for better distribution and contact with the microorganisms.
Therefore, option 'D' - only (iii) is the correct answer, as decreasing the time of contact (option i) and decreasing the temperature of water (option ii) both lead to a decrease in the disinfection efficiency of chlorine. Only increasing the temperature of water (option iii) can enhance the disinfection efficiency of chlorine.
Decreasing the time of contact:
- Chlorine is a powerful disinfectant and is commonly used to treat water for disinfection purposes. It works by killing or inactivating harmful bacteria, viruses, and other microorganisms that may be present in the water.
- When chlorine is added to water, it needs sufficient time to react and disinfect the water. By decreasing the time of contact, the chlorine may not have enough time to effectively kill or inactivate the microorganisms present in the water. Therefore, decreasing the time of contact will decrease the disinfection efficiency of chlorine.
Decreasing the temperature of water:
- The disinfection efficiency of chlorine is affected by the temperature of the water. Generally, higher temperatures enhance the disinfection process.
- When the water temperature is decreased, the reaction rate between chlorine and the microorganisms may slow down. This can lead to a decrease in the disinfection efficiency of chlorine.
- Additionally, lower temperatures may also affect the solubility of chlorine in water, which can further reduce its effectiveness as a disinfectant.
Increasing the temperature of water:
- Increasing the temperature of water can improve the disinfection efficiency of chlorine.
- Higher temperatures can increase the reaction rate between chlorine and the microorganisms, resulting in a more effective disinfection process.
- Moreover, increased temperatures can also enhance the solubility of chlorine in water, allowing for better distribution and contact with the microorganisms.
Therefore, option 'D' - only (iii) is the correct answer, as decreasing the time of contact (option i) and decreasing the temperature of water (option ii) both lead to a decrease in the disinfection efficiency of chlorine. Only increasing the temperature of water (option iii) can enhance the disinfection efficiency of chlorine.
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The disinfection efficiency of chlorine increases by:i) decreasing the time of contactii) decreasing the temperature of wateriii) increasing the temperature of waterThe correct answer is:a)only (i)b)Both (i) and (ii)c)Both (i) and (iii)d)only (iii)Correct answer is option 'D'. Can you explain this answer?
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