Clarifier with drainage device

摘要

The clarification basin comprises outlet means for clarification water, which surrounds a pre-clarification container arranged in the clarification basin. The pre-clarification container comprises a lower inlet opening (20) and is equipped on a height within the inlet opening with a flow for lateral supply of clarified water from the pre-clarification container towards outside. A covering element (28) for covering the clarification water surface is arranged in the pre-clarification container, which is formed as a riser (10) and the flow is formed as tube support (12). The clarification basin comprises outlet means for clarification water, which surrounds a pre-clarification container arranged in the clarification basin. The pre-clarification container comprises a lower inlet opening (20) and is equipped on a height within the inlet opening with a flow for lateral supply of clarified water from the pre-clarification container towards outside. A covering element (28) for covering the clarification water surface is arranged in the pre-clarification container, which is formed as a riser (10) and the flow is formed as tube support (12) that is aligned horizontal through a side wall of the riser and comprises a discharge opening. The covering element is tightly connected with the interior wall of the pre-clarification container or formed as single-piece. The covering element is formed as floating body that is movably arranged in the pre-clarification container in upward and downward manner. The floating body comprises a horseshoe shaped part (30) that lies plane on the water surface and grips the tube support with its shank on both sides. The covering element comprises a grooved lower side, which is concave or conical. An opening extends itself through the covering element in vertical direction. The covering element comprises a central opening that is arranged on high point of the cavity.