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Liquid treating apparatus

Image Number 4 for United States Patent #4006085.

Liquid treating apparatus wherein the inlet of a settling chamber communicates with the outlet of an aeration chamber. Retaining member(s) in the aeration chamber which divide it into two or more compartments are of sufficient porosity to permit the liquid to flow through at the required rate while retaining materials of a selected configuration or size. A permeable restraining member in the settling chamber separates the inlet from the outlet thereof and is of a mesh to permit liquid flow therethrough in a diffused manner. The restraining member extends above the high liquid level and terminates adjacent to the bottom of the settling chamber. An imperforate partition at the inlet end of the settling chamber carries a porous deflector which extends upwardly and inwardly in the settling chamber to restrain downward movement of liquid passing over the upper end of the partition. Sludge return conduits and suction-skimmer conduits transfer liquids and solids back from the settling chamber to the aeration chamber. Splash plates extend forwardly of the discharge end of such conduits and cause effluent to be spread into a thin sheet onto the surface of the liquid in the aeration chamber.

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