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The MLSS concentration in the aeration taken of extended aeration activated sludge process is 4000 mg/L. If one litre of sample settled in 30 minutes and the measuring cylinder showed a sludge volume of 200 ml, the sludge volume index (in mL/g) would be nearly (Answer up to the nearest integer)
Correct answer is '50'. Can you explain this answer?
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Calculation of Sludge Volume Index (SVI)
To calculate the sludge volume index (SVI), we need to know the volume of settled sludge and the concentration of mixed liquor suspended solids (MLSS). In this case, we are given that the MLSS concentration is 4000 mg/L, and one liter of sample settled in 30 minutes with a sludge volume of 200 ml.
Step 1: Convert MLSS concentration to settleable solids concentration
The MLSS concentration represents the total suspended solids in the mixed liquor. However, not all of these solids settle during the settling test. Therefore, we need to convert the MLSS concentration to the settleable solids concentration.
To do this, we use the concept of the settleable solids index (SSI), which is the ratio of the settleable solids concentration to the MLSS concentration. The SSI is typically a constant value for a specific type of activated sludge process.
Assuming the SSI for the extended aeration process is 0.6, we can calculate the settleable solids concentration as follows:
Settleable solids concentration = MLSS concentration * SSI
Settleable solids concentration = 4000 mg/L * 0.6
Settleable solids concentration = 2400 mg/L
Step 2: Calculate Sludge Volume Index (SVI)
The sludge volume index (SVI) is calculated using the following formula:
SVI = (Volume of settled sludge in ml) / (Settleable solids concentration in mg/L)
In this case, the volume of settled sludge is 200 ml and the settleable solids concentration is 2400 mg/L. Plugging these values into the formula, we get:
SVI = 200 ml / 2400 mg/L
SVI = 0.0833 ml/mg
However, the SVI is typically expressed in ml/g, so we need to convert the units:
SVI (ml/g) = SVI (ml/mg) * 1000 (mg/g)
SVI (ml/g) = 0.0833 ml/mg * 1000 mg/g
SVI (ml/g) = 83.3 ml/g
Step 3: Round the answer to the nearest integer
As per the given instructions, we need to round the SVI to the nearest integer. Therefore, the SVI would be approximately 83 ml/g.
However, the correct answer mentioned in the question is '50'. It seems there might be an error in the calculations or the given answer. Please double-check the calculations or provide additional information to resolve the discrepancy.
To calculate the sludge volume index (SVI), we need to know the volume of settled sludge and the concentration of mixed liquor suspended solids (MLSS). In this case, we are given that the MLSS concentration is 4000 mg/L, and one liter of sample settled in 30 minutes with a sludge volume of 200 ml.
Step 1: Convert MLSS concentration to settleable solids concentration
The MLSS concentration represents the total suspended solids in the mixed liquor. However, not all of these solids settle during the settling test. Therefore, we need to convert the MLSS concentration to the settleable solids concentration.
To do this, we use the concept of the settleable solids index (SSI), which is the ratio of the settleable solids concentration to the MLSS concentration. The SSI is typically a constant value for a specific type of activated sludge process.
Assuming the SSI for the extended aeration process is 0.6, we can calculate the settleable solids concentration as follows:
Settleable solids concentration = MLSS concentration * SSI
Settleable solids concentration = 4000 mg/L * 0.6
Settleable solids concentration = 2400 mg/L
Step 2: Calculate Sludge Volume Index (SVI)
The sludge volume index (SVI) is calculated using the following formula:
SVI = (Volume of settled sludge in ml) / (Settleable solids concentration in mg/L)
In this case, the volume of settled sludge is 200 ml and the settleable solids concentration is 2400 mg/L. Plugging these values into the formula, we get:
SVI = 200 ml / 2400 mg/L
SVI = 0.0833 ml/mg
However, the SVI is typically expressed in ml/g, so we need to convert the units:
SVI (ml/g) = SVI (ml/mg) * 1000 (mg/g)
SVI (ml/g) = 0.0833 ml/mg * 1000 mg/g
SVI (ml/g) = 83.3 ml/g
Step 3: Round the answer to the nearest integer
As per the given instructions, we need to round the SVI to the nearest integer. Therefore, the SVI would be approximately 83 ml/g.
However, the correct answer mentioned in the question is '50'. It seems there might be an error in the calculations or the given answer. Please double-check the calculations or provide additional information to resolve the discrepancy.
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The MLSS concentration in the aeration taken of extended aeration activated sludge process is 4000 mg/L. If one litre of sample settled in 30 minutes and the measuring cylinder showed a sludge volume of 200 ml, the sludge volume index (in mL/g) would be nearly (Answer up to the nearest integer)Correct answer is '50'. Can you explain this answer?
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The MLSS concentration in the aeration taken of extended aeration activated sludge process is 4000 mg/L. If one litre of sample settled in 30 minutes and the measuring cylinder showed a sludge volume of 200 ml, the sludge volume index (in mL/g) would be nearly (Answer up to the nearest integer)Correct answer is '50'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The MLSS concentration in the aeration taken of extended aeration activated sludge process is 4000 mg/L. If one litre of sample settled in 30 minutes and the measuring cylinder showed a sludge volume of 200 ml, the sludge volume index (in mL/g) would be nearly (Answer up to the nearest integer)Correct answer is '50'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The MLSS concentration in the aeration taken of extended aeration activated sludge process is 4000 mg/L. If one litre of sample settled in 30 minutes and the measuring cylinder showed a sludge volume of 200 ml, the sludge volume index (in mL/g) would be nearly (Answer up to the nearest integer)Correct answer is '50'. Can you explain this answer?.
The MLSS concentration in the aeration taken of extended aeration activated sludge process is 4000 mg/L. If one litre of sample settled in 30 minutes and the measuring cylinder showed a sludge volume of 200 ml, the sludge volume index (in mL/g) would be nearly (Answer up to the nearest integer)Correct answer is '50'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The MLSS concentration in the aeration taken of extended aeration activated sludge process is 4000 mg/L. If one litre of sample settled in 30 minutes and the measuring cylinder showed a sludge volume of 200 ml, the sludge volume index (in mL/g) would be nearly (Answer up to the nearest integer)Correct answer is '50'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The MLSS concentration in the aeration taken of extended aeration activated sludge process is 4000 mg/L. If one litre of sample settled in 30 minutes and the measuring cylinder showed a sludge volume of 200 ml, the sludge volume index (in mL/g) would be nearly (Answer up to the nearest integer)Correct answer is '50'. Can you explain this answer?.
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