Foam flotation concentrator专利检索-厌氧消化废物处理与管理专利检索查询-专利查询网

Foam flotation concentrator

阅读：136发布：2022-12-17

专利汇可以提供Foam flotation concentrator专利检索，专利查询，专利分析的服务。并且A suspension of activated sludge from a secondary settling tank is concentrated by a bubble flotation process. Air is forced through a mixture of water and a surfactant in a shear-type foamer at low pressure to produce a stable foam of small air bubbles in water. The foam is pumped into the suspension entering the concentrator and the bubbles attach to the solids in the suspension. The mixture of foam and suspension is released within a baffle in the concentrator tank, causing the surfactant shielded air bubbles to lift the solids to which they have become attached and form a blanket of concentrated sludge. A rotating skimmer head removes an upper layer of the sludge blanket whereas the clarified effluent flows under the baffle and out over an annular weir for discharge. The concentrated sludge removed from the concentrator is introduced into an anaerobic digester, along with primary sludge from the primary settling tank of the system. One overall effect is to reduce the size required for the digester.，下面是Foam flotation concentrator专利的具体信息内容。

权利要求

2. The method of claim 1, comprising the step of isolating the zone of suspension release from the zone of clarified suspension removal while providing for flow of clarified suspension between said zones.

3. In apparatus for clarifying a liquid suspension of solids including a flotation tank, an open bottom solids baffle extending downwardly a substantial distance within said tank, inlet means cooperatively associated with said tank for introducing the incoming liquid suspension of solids into said tank means within said baffle for releasing said liquid suspension of solids from said inlet means, means for introducing air into said inlet means, means for introducing clarified liquid into said inlet means, means for withdrawing floating solids from within said baffle, and means for withdrawing clarified liquid from said tank; the improvement comprising: a closed chamber and rotor assembly having a plurality of relatively movable turbulence-producing elements including rotor blades and stator blades defining a shear-type foamer, means containing a supply of surfactant, said air and clarified liquid introducing means including a connection to said foamer, means connecting said surfactant supply to said foamer, means controlling the introduction, respectively, of predetermined quantities of said liquid, said surfactant, and air into said shear-type foamer to produce a foam mass of small, surfactant-shielded air bubbles entrained in said liquid and, wherein said air and clarified liquid introducing means further includes a connection between said shear-type foamer and said inlet means thereby to permit flow of said foam mass thereto, said connection to said inlet means being disposed at a point thereof upstream from said tank, thereby to permit said foam mass bubbles to mix with and attach to the suspended solids of said liquid suspension prior to release thereof by said releasing means.

4. The apparatus of claim 3, wherein said releasing means for the liquid suspension of solids and admixed foam mass comprises a dispersing conical diffuser having a mouth that is subjacent the liquid level in the tank, and wherein the body of liquid above said diffuser mouth is unobstructed by baffle means.

5. The apparatus of claim 3, wherein said shear-type foamer furtheR comprises a fixed shroud within and spaced from the walls of said closed chamber, and wherein said stator blades are radially disposed inside said shroud, said rotor blades comprise a propeller within said shroud adjacent to said stator blades, and means for driving said propeller.

6. The apparatus of claim 3, wherein said surfactant is partially biodegradable for use in sewage disposal systems.

7. The apparatus of claim 6, wherein said surfactant comprises a mixture of an alkene oxide with a high molecular weight phenol.

8. The apparatus of claim 6, wherein the principal active ingredient of said surfactant is a soluble methylcellulose.

说明书全文

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Foam flotation concentrator

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