Environmental Engineering
The working conditions in imhoff tanks are

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

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Environmental Engineering
The polluted water is one which

Contains pathogenic bacteria
Consists of undesirable substances rendering it unfit for drinking and domestic use
Is contaminated
Is safe and suitable for drinking and domestic use

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