Liquid purification or separation – Recirculation – Serially connected distinct treating or storage units
Patent
1991-10-17
1993-12-21
Lithgow, Thomas M.
Liquid purification or separation
Recirculation
Serially connected distinct treating or storage units
210197, 210220, 2102211, 210256, 210520, 210525, 210530, B01D 2102, B01D 2128
Patent
active
052718328
ABSTRACT:
An activation plant for the treatment of waste water by the activated sludge method is disclosed wherein the plant has an outer, annular activation tank, a concentric, inner, funnel shaped secondary sedimentation tank, and a rotating aeration bridge rotating about the central axis. The return sludge, excess sludge, and floating sludge chambers, and the associated pumps, are provided in a central shaft that is the central axis for the concentric tanks. The floating sludge chamber is supplied by an annular trough circumscribing the central shaft. Clean water is removed through a conduit in the central shaft. The central shaft, chambers, and aeration bridge are supported by at least three rectangular tubes that are mounted on the wall of the secondary sedimentation tank and extend radially from the conduit for clean water in the central shaft. The rectangular tubes provide a flow space for clean water from the activation plant and are connected to outlet troughs for collecting the clean water. Roof shaped downflow baffle hoods are provided against floating sludge in the outlet troughs.
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Lithgow Thomas M.
Schreiber Erhard
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