Method for dewatering sludge or slurry

Details Method for dewatering sludge or slurry Method for dewatering sludge or slurry

1988-11-25

1990-04-03

Bascomb, Wilbur

Concentrating evaporators

Processes

159 22, 159 431, 159 473, 159DIG16, 159DIG42, 34 15, 34 92, 34242, 137895, 202205, 202269, 203 2, 203 11, 203DIG14, B01D 310

Patent

active

049137719

ABSTRACT:
Sludge or slurry is dewatered by passing it on a screw conveyor through a sealed vessel at a vacuum more negative than -10 inches of Hg.
As a result, moisture is removed from the sludge or slurry as water vapor. The vessel is sealed from air by the presence of the sludge or slurry at the inlet and outlet port extents of the vessel.

REFERENCES:
patent: 144358 (1873-11-01), Root
patent: 3214352 (1965-10-01), Wells
patent: 3799234 (1974-03-01), Skidmore
patent: 3826718 (1974-07-01), Takayasu
patent: 3859052 (1975-01-01), Walther
patent: 3997406 (1976-12-01), Arvanitakis
patent: 4141799 (1979-02-01), Thelen et al.
patent: 4198265 (1980-04-01), Johnson
patent: 4296072 (1981-10-01), Takacs et al.

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