Method for separating solid particles from a liquid
OwnerHans Stedfeldtinventor
Life of this patent
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Abstract
An improved method for separating solid particles from liquids, such as dewatering and thickening of sludge collected in a container (1), involves the use of at least one drainage unit (9) having doubled screened jacket walls (25, 26) defining a dewatering chamber (10). The liquid relieved of solids within the chamber is subjected to a turbulent motion acting against said screened jacket walls for obstruction of the solids deposition at the wall surfaces of the chamber facing the sludge in the container. The turbulent motion is obtained by a forced fluid F introduced in the chamber through one or more tubes (30, 31). The fluid may favorably be in form of compressed air or water returned from the reject system (14, 16).
Claims8
An improved method for dewatering sludge by separating and draining liquid from solid suspensions, comprising the steps of:
- introducing the sludge to be dewatered into a container;
- providing at least one drainage unit in said container, said drainage unit including double screened jacket walls defining therebetween an annular dewatering chamber;
- separating the liquid from the solid suspensions in said container by moving the separated liquid through said jacket walls into said dewatering chamber;
- simultaneously with said separating step, imparting a turbulence to the separated liquid in said annular dewatering chamber to prevent deposition of solids on said jacket walls of said annular dewatering chamber while the liquid is being separated therefrom;
- draining the separated liquid from said annular dewatering chamber;
- removing the dewatered sludge from the bottom of said container.
Dependencies are inferred from the claim text.