Imhoff tank is a type of underground wastewater treatment system that uses a combination of sedimentation and anaerobic digestion to treat sewage. The tank is divided into two sections: an upper sedimentation chamber where solids settle out of the wastewater and a lower anaerobic digestion chamber where bacteria break down organic matter in the absence of oxygen. The Imhoff tank is named after German engineer Karl Imhoff, who developed the system in the early 1900s. It is a relatively simple and cost-effective method of wastewater treatment that can be used in both residential and industrial settings
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