| 摘要 |
A floating decanter for removing supernatant from sequential batch reactors, clarifiers, or other similar devices. Sealed tanks support a central sump which has two peripheral openings which allow liquid to enter the sump and a cover to prevent splash over. A drain opening in the bottom of the sump allows liquid to drain out of the sump. Each of the peripheral openings has a hinged floating weir. Skirts around the drain opening in the bottom define the height of liquid in the sump upon which the floating weir rides. A barrier generally in front of and above the floating weir, prevents the surface of the liquid from entering the sump of the decanter. A horizontal plate positioned at the bottom of the sump provides a spoiler which discourages liquid from below the level of the sump from entering the sump. A plate, hinged where it joins the barrier above the weir, extends down to the lower lip of the sump. This plate generally seals the peripheral openings from intrusion of active sewage when the drain means is closed, and is pushed out of the way by the force of the liquid entering the sump when the drain means is turned on. This decanter causes a constant withdrawal rate of liquid supernate, while preventing the intake of scum and sludge during operation, and prevents sewage from entering the sump while dormant during the aeration or settling phase of a sequential batch reactor.
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