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Which one of the following sequences is the most suitable for treating raw surface water to make it suitable for drinkage purpose ?
- a)Screening → filtration → sedimentation→ disinfection
- b)Screening → disinfection → sedimentation→ filtration
- c)Screening → sedimentation → disinfection→ filtration
- d)Screening → sedimentation → filtration→ disinfection
Correct answer is option 'D'. Can you explain this answer?
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Which one of the following sequences is the most suitable for treating...
-Screening is the first unit operation used at wastewater treatment plants (WWTPs). Screening removes objects such as rags, paper, plastics, and metals to prevent damage and clogging of downstream equipment, piping, and appurtenances.
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-Sedimentation is the process of allowing particles in suspension in water to settle out of the suspension under the effect of gravity. The particles that settle out from the suspension become sediment, and in water treatment is known as sludge.
-Filtration, the process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that permits the fluid to pass through but retains the solid particles. Either the clarified fluid or the solid particles removed from the fluid may be the desired product.
-Water disinfection means the removal, deactivation or killing of pathogenic microorganisms. Microorganisms are destroyed or deactivated, resulting in termination of growth and reproduction. When microorganisms are not removed from drinking water, drinking water usage will cause people to fall ill.
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Which one of the following sequences is the most suitable for treating...
Screening:
- Screening is the first step in the treatment process of raw surface water.
- It involves the removal of large debris such as sticks, leaves, and other floating objects.
- This process ensures that the water entering the treatment plant is free from large contaminants that could clog or damage the subsequent treatment equipment.
Sedimentation:
- Sedimentation is the next step in the treatment process.
- It involves allowing the water to sit undisturbed in a tank or basin.
- During this process, suspended particles and heavy materials settle to the bottom of the tank due to gravity.
- Sedimentation helps in the removal of fine particles, such as silt and clay, as well as heavier materials like sand and gravel.
Filtration:
- Filtration is an important step in water treatment.
- It involves passing the water through various media, such as sand, gravel, and activated carbon.
- The filtration process removes smaller suspended particles, including microorganisms, from the water.
- It helps in improving the clarity and quality of the water by removing impurities that can affect taste, odor, and appearance.
Disinfection:
- Disinfection is the final step in the treatment process.
- It involves the use of chemical or physical agents to kill or inactivate disease-causing microorganisms, such as bacteria, viruses, and protozoa.
- Common disinfectants used in water treatment include chlorine, ozone, and ultraviolet (UV) light.
- Disinfection ensures that any remaining pathogens in the water are destroyed, making it safe for consumption.
Explanation:
- Among the given options, option 'D' (Screening, sedimentation, filtration, disinfection) is the most suitable sequence for treating raw surface water to make it suitable for drinking purposes.
- Screening is necessary to remove large debris and floating objects.
- Sedimentation helps in the removal of suspended particles and heavy materials.
- Filtration further improves the water quality by removing smaller particles.
- Disinfection ensures that any remaining pathogens are eliminated.
- This sequence ensures that the water is thoroughly treated and meets the required standards for safe drinking water.
- Screening is the first step in the treatment process of raw surface water.
- It involves the removal of large debris such as sticks, leaves, and other floating objects.
- This process ensures that the water entering the treatment plant is free from large contaminants that could clog or damage the subsequent treatment equipment.
Sedimentation:
- Sedimentation is the next step in the treatment process.
- It involves allowing the water to sit undisturbed in a tank or basin.
- During this process, suspended particles and heavy materials settle to the bottom of the tank due to gravity.
- Sedimentation helps in the removal of fine particles, such as silt and clay, as well as heavier materials like sand and gravel.
Filtration:
- Filtration is an important step in water treatment.
- It involves passing the water through various media, such as sand, gravel, and activated carbon.
- The filtration process removes smaller suspended particles, including microorganisms, from the water.
- It helps in improving the clarity and quality of the water by removing impurities that can affect taste, odor, and appearance.
Disinfection:
- Disinfection is the final step in the treatment process.
- It involves the use of chemical or physical agents to kill or inactivate disease-causing microorganisms, such as bacteria, viruses, and protozoa.
- Common disinfectants used in water treatment include chlorine, ozone, and ultraviolet (UV) light.
- Disinfection ensures that any remaining pathogens in the water are destroyed, making it safe for consumption.
Explanation:
- Among the given options, option 'D' (Screening, sedimentation, filtration, disinfection) is the most suitable sequence for treating raw surface water to make it suitable for drinking purposes.
- Screening is necessary to remove large debris and floating objects.
- Sedimentation helps in the removal of suspended particles and heavy materials.
- Filtration further improves the water quality by removing smaller particles.
- Disinfection ensures that any remaining pathogens are eliminated.
- This sequence ensures that the water is thoroughly treated and meets the required standards for safe drinking water.
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Which one of the following sequences is the most suitable for treating raw surface water to make it suitable for drinkage purpose ?a)Screening filtration sedimentation disinfectionb)Screening disinfection sedimentation filtrationc)Screening sedimentation disinfection filtrationd)Screening sedimentation filtration disinfectionCorrect answer is option 'D'. Can you explain this answer?
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