If the only treatment ...

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If the only treatment process you have are the Imhoff Tanks then it is used for the clarification of sewage by simple settling and sedimentation, along with anaerobic digestion of the settled sludge. That's it..no activated sludge foaming, etc.. The previous comment on wastewater content (shampoo, surfactants, etc.) is more valid.

Another discussion group's input may be helpful:

https://www.researchgate.net/post/What_causes_severe_foaming_of_effluent_from_Imhoff_tanks