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A rotating flighted cylinder for solid-liquid separation and biological waste treatment

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  • A single device for solid-liquid separation and biological waste treatment was designed, built, and evaluated. The device, a rotating flighted cylinder, consists of a cylindrical tube which has a helically wound fin mounted perpendicular to the interior surface. When mounted at a slight incline (7 to 15 degrees) and slowly rotated (1 to 3 rpm), the device provides a mechanism to accomplish sedimentation between wraps of the fin. The settled solids are augered toward the upper end and discharged as a solids-rich stream. The fin surfaces, alternately exposed to the waste and the atmosphere, perform conversion of soluble organic matter to bacterial cells in a manner similar to rotating disk processes. The solid-liquid separation aspect of the device was evaluated with respect to dilute dairy and swine manure slurries. The unit was demonstrated to be a non-plugging, low cost device for removal of settleable particles. It did not remove floating solids. The 24-inch unit was tested at flow rates of 1 to 10 gpm. As a biological waste treatment device, the unit was evaluated for the treatment of dilute animal manure slurries and domestic sewage. The constituent removal efficiencies were similar to those achieved in conventional secondary sewage treatment plants. When analyzed, the rotating flighted cylinder performance was consistent with data previously generated for rotating disk pro­cesses. The fact that the rotating flighted cylinder eliminated the need for a subsequent sedimentation tank gave it a specific advantage. Overall, the rotating flighted cylinder was demonstrated to be a simple, low cost, low energy-consumptive device for the treatment of small domestic and agricultural waste flows. Where a tem­porary or seasonal treatment unit is needed, it has some particular advantages over conventional package plants.
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