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Generally, water is satisfactorily disinfected, if the free available residual chlorine is about __________mg/litre at the end of 10 minutes contact periods.
- a)0.2
- b)0.5
- c)1.0
- d)2.0
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Generally, water is satisfactorily disinfected, if the free available ...
Generally water is satisfactory disinfected if the free available residual chlorine is about 0.2 mg/lit. When free Cl2 residual excess present in water and comes in contact with organic substances produce THM (Tri-halo-methane) in water which are carcinogenic in nature. Therefore free chlorine residual if present above 0.2 mg/lit there is a risk of THM formation and if present less than 0.1 mg/lit, no future protection.
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Generally, water is satisfactorily disinfected, if the free available ...
The correct answer is option 'A' (0.2 mg/litre).
Water disinfection is a crucial step in the treatment process to ensure that the water is safe for consumption by eliminating harmful microorganisms. One of the commonly used disinfectants is chlorine, which is added to water in the form of free available residual chlorine (FAC).
The concentration of free available residual chlorine is an important parameter to determine the effectiveness of disinfection. It is usually measured in milligrams per liter (mg/litre). The recommended concentration of FAC varies depending on the contact time.
Here, the question states that the contact period is 10 minutes. For satisfactory disinfection, the concentration of free available residual chlorine at the end of this contact period should be about 0.2 mg/litre.
Explanation:
1. Water Disinfection:
- Water disinfection is the process of eliminating or inactivating disease-causing microorganisms present in water.
- It is an essential step in water treatment to ensure the safety of drinking water.
2. Free Available Residual Chlorine (FAC):
- Free available residual chlorine refers to the concentration of chlorine available for disinfection after the required contact time.
- Chlorine is added to water in the form of hypochlorous acid (HOCl) or hypochlorite ion (OCl-) to kill microorganisms.
- The concentration of FAC is measured in mg/litre.
3. Importance of Free Available Residual Chlorine Concentration:
- The concentration of FAC determines the effectiveness of disinfection.
- If the concentration is too low, it may not be sufficient to kill or inactivate microorganisms.
- If the concentration is too high, it may lead to taste and odor issues and the formation of disinfection by-products.
4. Recommended Concentration of FAC:
- The recommended concentration of FAC is based on the contact time between the chlorine and microorganisms.
- For a contact period of 10 minutes, a concentration of around 0.2 mg/litre is considered satisfactory for disinfection.
- This concentration has been found to effectively kill or inactivate most microorganisms.
Conclusion:
In conclusion, for satisfactory disinfection of water, the free available residual chlorine concentration should be around 0.2 mg/litre at the end of a 10-minute contact period. This concentration has been determined based on the effectiveness of chlorine in killing or inactivating microorganisms.
Water disinfection is a crucial step in the treatment process to ensure that the water is safe for consumption by eliminating harmful microorganisms. One of the commonly used disinfectants is chlorine, which is added to water in the form of free available residual chlorine (FAC).
The concentration of free available residual chlorine is an important parameter to determine the effectiveness of disinfection. It is usually measured in milligrams per liter (mg/litre). The recommended concentration of FAC varies depending on the contact time.
Here, the question states that the contact period is 10 minutes. For satisfactory disinfection, the concentration of free available residual chlorine at the end of this contact period should be about 0.2 mg/litre.
Explanation:
1. Water Disinfection:
- Water disinfection is the process of eliminating or inactivating disease-causing microorganisms present in water.
- It is an essential step in water treatment to ensure the safety of drinking water.
2. Free Available Residual Chlorine (FAC):
- Free available residual chlorine refers to the concentration of chlorine available for disinfection after the required contact time.
- Chlorine is added to water in the form of hypochlorous acid (HOCl) or hypochlorite ion (OCl-) to kill microorganisms.
- The concentration of FAC is measured in mg/litre.
3. Importance of Free Available Residual Chlorine Concentration:
- The concentration of FAC determines the effectiveness of disinfection.
- If the concentration is too low, it may not be sufficient to kill or inactivate microorganisms.
- If the concentration is too high, it may lead to taste and odor issues and the formation of disinfection by-products.
4. Recommended Concentration of FAC:
- The recommended concentration of FAC is based on the contact time between the chlorine and microorganisms.
- For a contact period of 10 minutes, a concentration of around 0.2 mg/litre is considered satisfactory for disinfection.
- This concentration has been found to effectively kill or inactivate most microorganisms.
Conclusion:
In conclusion, for satisfactory disinfection of water, the free available residual chlorine concentration should be around 0.2 mg/litre at the end of a 10-minute contact period. This concentration has been determined based on the effectiveness of chlorine in killing or inactivating microorganisms.
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Generally, water is satisfactorily disinfected, if the free available residual chlorine is about __________mg/litre at the end of 10 minutes contact periods.a)0.2b)0.5c)1.0d)2.0Correct answer is option 'A'. Can you explain this answer?
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