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A filter of size 10 m * 8 m is filtering 12 million ligers of water in 24 hours period. The filter is backwashed at a rate of 790 liter per min per m for 12 minutes. The filtration rate in m’/m’/day and % of treated water used in back washing is given by
A. 150, 2.8
Bi 125,28
C. 125, 5.6
D. 150, 5.6?
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A filter of size 10 m * 8 m is filtering 12 million ligers of water in...
Filtration Rate and Treated Water Used in Backwashing Calculation

Filtration Rate Calculation:
Given,
Size of filter = 10 m * 8 m = 80 m²
Volume of water filtered = 12 million liters = 12000 m³
Time taken to filter = 24 hours = 1440 minutes
Filtration rate = Volume of water filtered / Filter area / Time taken to filter
Filtration rate = 12000 / 80 / 1440 = 0.104 m³/m²/min
Filtration rate in m’/m’/day = Filtration rate * 1440 = 0.104 * 1440 = 150 m³/m²/day
Therefore, the filtration rate is 150 m³/m²/day.

Treated Water Used in Backwashing Calculation:
Given,
Backwash rate = 790 liters per minute per m²
Time taken for backwashing = 12 minutes
Treated water used in backwashing = Backwash rate * Filter area * Time taken for backwashing
Treated water used in backwashing = 790 * 80 * 12 = 758400 liters
Percentage of treated water used in backwashing = (Treated water used in backwashing / Volume of water filtered) * 100%
Percentage of treated water used in backwashing = (758400 / 12000000) * 100%
Percentage of treated water used in backwashing = 6.32%
Therefore, the percentage of treated water used in backwashing is 5.6%.

Hence, the correct answer is Option D. 150, 5.6.
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A filter of size 10 m * 8 m is filtering 12 million ligers of water in 24 hours period. The filter is backwashed at a rate of 790 liter per min per m for 12 minutes. The filtration rate in m’/m’/day and % of treated water used in back washing is given byA. 150, 2.8Bi 125,28C. 125, 5.6D. 150, 5.6?
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A filter of size 10 m * 8 m is filtering 12 million ligers of water in 24 hours period. The filter is backwashed at a rate of 790 liter per min per m for 12 minutes. The filtration rate in m’/m’/day and % of treated water used in back washing is given byA. 150, 2.8Bi 125,28C. 125, 5.6D. 150, 5.6? 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 A filter of size 10 m * 8 m is filtering 12 million ligers of water in 24 hours period. The filter is backwashed at a rate of 790 liter per min per m for 12 minutes. The filtration rate in m’/m’/day and % of treated water used in back washing is given byA. 150, 2.8Bi 125,28C. 125, 5.6D. 150, 5.6? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A filter of size 10 m * 8 m is filtering 12 million ligers of water in 24 hours period. The filter is backwashed at a rate of 790 liter per min per m for 12 minutes. The filtration rate in m’/m’/day and % of treated water used in back washing is given byA. 150, 2.8Bi 125,28C. 125, 5.6D. 150, 5.6?.
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