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Question

A city is going to install the rapid sand filter after the sedimentation tank. Use the following data:
Design loading rate to the filter = 200 m3/m2/d ;
Design now rate = 0.5 m3/s
Surface area per filter box = 50 m2
The number of filters required shall be

A
4
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B
6
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C
8
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D
3
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Solution

The correct option is B 6
Surface area required

=Design flow rateloading rate

=0.5×86400 m3/d200 m/d

=216 m2

Number of filter required

=Surface area requiredSurface area per filter=21650

= 4.32
= 5 filters

One additional filter is provided so that maintainance of filter should be carried without providing any overloading on any filter so, number of filters = 5+1= 6 filters.

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