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    • 5. 发明专利
    • PRECONDENSATION PROCESS FOR SLUDGE FREEZEETHAW DESICCATING APPARATUS
    • JPS5681200A
    • 1981-07-02
    • JP15635279
    • 1979-12-04
    • FUJI ELECTRIC CO LTD
    • SUGIURA KIYOSHI
    • C02F11/12C02F11/20G05D7/00G05D11/10
    • PURPOSE:To obtain a constantly stable condensation effect and to eliminate accumulations of fine grains in a separated water recycling system, by keeping at a substantially constant level a recovery rate of a centrifugal separator calculated from the contents of condensed sludge and separated water during a precondensation step using a centrifugal separator. CONSTITUTION:A sludge is charged to a centrifugal separator 10 by a pump 22. In the separator 10, the sludge is divided to a solid part and a liquid part by the rotations of an outside drum 12 and an inside drum 14. The condensed sludge is scraped out along the direction A, and carried to a freeze-thaw vessel through a conduit 16. The separated water overflows along the direction B, and is discharged through a conduit 18. The discharged water is optionally recycled to a sludge storing vessel. During this separation step, the contents of the separated water and the sludges before and after condensation are detected by potentiometers 30, 26 and 28, respectively. Each content signal is carried to a computer 32 by which a recovery rate is calculated. In order to keep at a constant level the recovery rate calculated by the computer 32, a controller 34 feeds a rotation speed increase signal to a speed variable motor 36, so that an amount of a sludge being charged is controlled in accordance with the variation of a supplied sludge content by the operation of the pump 22.