The 'imhoff tank' in sewage treatment serves the dual purpose of:
Choose the correct answer
Filtration and chlorination
Primary sedimentation (upper chamber) and anaerobic sludge digestion (lower chamber) in one unit
Aeration and settling simultaneously
Chemical coagulation and flocculation
Correct Answer
B. Primary sedimentation (upper chamber) and anaerobic sludge digestion (lower chamber) in one unit
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Imhoff tank: combines primary sedimentation (upper compartment) and sludge digestion (lower anaerobic digestion compartment) in a single unit. Sludge slides from upper to lower chamber through slot. Simple, no mechanical equipment. Used for small communities. Disadvantage: not efficient as separate tanks.
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