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The alum added as a coagulant in water treatment functions better when the raw water is
- a)acidic with high turbidity
- b)alkaline with high turbidity
- c)neutral with low turbidity
- d)acidic with low turbidity
Correct answer is option 'B'. Can you explain this answer?
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The alum added as a coagulant in water treatment functions better whe...
To accomplish this, the water is treated with aluminum sulphate, commonly called alum, which serves as a flocculant. Raw water often holds tiny suspended particles that are very difficult for a filter to catch. The alum promotes the coagulation of fine particles, which helps resolve problems of color as well as turbidity.
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Hence the correct answer is option B.
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The alum added as a coagulant in water treatment functions better whe...
Coagulation is an essential step in the water treatment process that involves the addition of chemicals to the raw water to remove impurities. One of the commonly used coagulants is alum or aluminum sulfate.
The effectiveness of alum as a coagulant depends on several factors, including the pH and turbidity of the raw water.
pH of Raw Water:
Alum works best in alkaline conditions, with a pH range of 6.5 to 8.5. At this pH range, aluminum hydroxide precipitates form quickly, which helps to trap and remove impurities such as suspended solids and microorganisms.
If the raw water is too acidic or too basic, the alum may not work effectively, and the coagulation process may be compromised.
Turbidity of Raw Water:
Turbidity refers to the cloudiness or haziness of the water caused by the presence of suspended particles, such as silt, clay, and organic matter.
Alum is more effective in water with high turbidity levels because the particles are more likely to collide and form larger flocs that can be easily removed by sedimentation or filtration.
On the other hand, if the raw water has low turbidity levels, the alum may not be needed or may require a lower dosage since there are fewer particles to coagulate.
Conclusion:
In summary, alum added as a coagulant in water treatment functions better when the raw water is alkaline with high turbidity. This condition allows for efficient coagulation and sedimentation of impurities, resulting in clearer and safer drinking water.
The effectiveness of alum as a coagulant depends on several factors, including the pH and turbidity of the raw water.
pH of Raw Water:
Alum works best in alkaline conditions, with a pH range of 6.5 to 8.5. At this pH range, aluminum hydroxide precipitates form quickly, which helps to trap and remove impurities such as suspended solids and microorganisms.
If the raw water is too acidic or too basic, the alum may not work effectively, and the coagulation process may be compromised.
Turbidity of Raw Water:
Turbidity refers to the cloudiness or haziness of the water caused by the presence of suspended particles, such as silt, clay, and organic matter.
Alum is more effective in water with high turbidity levels because the particles are more likely to collide and form larger flocs that can be easily removed by sedimentation or filtration.
On the other hand, if the raw water has low turbidity levels, the alum may not be needed or may require a lower dosage since there are fewer particles to coagulate.
Conclusion:
In summary, alum added as a coagulant in water treatment functions better when the raw water is alkaline with high turbidity. This condition allows for efficient coagulation and sedimentation of impurities, resulting in clearer and safer drinking water.
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The alum added as a coagulant in water treatment functions better when the raw water isa)acidic with high turbidityb)alkaline with high turbidityc)neutral with low turbidityd)acidic with low turbidityCorrect answer is option 'B'. Can you explain this answer?
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