Method and apparatus for drying sewage sludge
AssigneeSevar Entsorgungsanlagen GmbH
InventorJurgen Manzei
Life of this patent
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Abstract
Described are a method of drying sewage sludge and an apparatus for carrying out the method, wherein the liquid sewage sludge is converted into a pastry consistency in a predrying means (10), the pastry sewage sludge is then put into the form of particles of relatively large surface area in a shaping means (16), and the particles are thereafter exposed to a stream (52) of drying gas in a drying means (48).
Claims26
Apparatus for carrying out the drying of sewage sludge comprising:
- predrying means in which the liquid sewage sludge is converted into a pasty consistency;
- shaping means in which the pasty sludge is put into the form of elongated particles, conveyor screw means, receiving means, said conveyor screw means supplying said sewage sludge from said predrying means and said receiving means, die means arranged beneath said receiving means, said receiving means being in the form of a longitudinal channel which is concentric with respect to the longitudinal axis of said conveyor screw means and pivotable about said longitudinal axis of said conveyor screw means, a stripper member located between said conveyor screw means and said receiving means for stripping said pasty sewage sludge from said receiving means, said die having perforation holes therein, a pressing member being capable of pressing the pasty sludge through said die, and forming elongated particles;
- and drying means for drying said elongated particles to a predetermined residual moisture content.
Apparatus for carrying out the drying of liquid sewage sludge comprising predrying means for converting said liquid sewage sludge into a partially dried sewage sludge, shaping means for forming said partially dried sewage sludge into elongated particles, metering means for metering a predetermined amount of said partially dried sewage sludge into said shaping means whereby said elongated particles have a predetermined length determined by said predetermined amount of said partially dried sewage sludge metered into said shaping means, and drying means for drying said elongated particles to a predetermined residual moisture content, said shaping means including die means including a plurality of apertures extending therethrough and pressing means for pressing said partially dried sewage sludge through said plurality of apertures in said die means so as to form said elongated particles therefrom, and said metering means including receiving means for carrying said predetermined amount of said partially dried sewage sludge and intermittently supplying said predetermined amount of said partially dried sewage sludge to said shaping means, and conveyance means for continuously supplying said partially dried sewage sludge to said receiving means.
Dependencies are inferred from the claim text.