Environmental Engineering
Double filtration is used

All of these
To increase the filtration slow sand filters capacity of
To increase the filtration rapid sand filters capacity of
For isolated buildings like pools, hotels etc swimming

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Environmental Engineering
Sludge volume index is defined as the ratio of

Percentage of sludge by volume to percentage of total solids by weight
Percentage of total solids by weight to percentage of sludge by volume
Percentage of sludge by volume to percentage of suspended solids by weight
Percentage of suspended solids by weight to percentage of sludge by volume

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