Environmental Engineering
The working conditions in imhoff tanks are

anaerobic in lower compartment and aerobic in upper compartment
Anaerobic only
Aerobic only
Aerobic in lower compartment and anaerobic in upper compartment

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Environmental Engineering
Double filtration is used

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
All of these

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