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* the [[Septic Tank]] (S.9), where the low sludge removal frequency leads to anaerobic degradation of the sludge.
* the [[Anaerobic Baffled Reactor(ABR) 1]] (S.10/T.3) and the Anaerobic Filter (S.11/T.4) both usually include a settler as the first compartment. However, the settler may also be built separately, e.g., in municipal treatment plants or in the case of prefabricated, modular units.
* the [[Biogas Reactor]] (S.12/T.17), which can be considered as a settler designed for anaerobic digestion and biogas production.
* the Imhoff Tank (T.2) and the [[Upflow Anaerobic Sludge Blanket Reactor | Upflow Anaerobic Sludge Blanket Reactor]] (UASB, T.11), designed for the digestion of the settled sludge, prevent gases or sludge particles in the lower section from entering/returning to the upper section.
