Filtering Apparatus and Filtering Method
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United States of America Patent
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Issued Date -
Feb 26, 2009
app pub date -
Jun 2, 2006
filing date -
Jun 16, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
To provide a filtering apparatus and a filtering method, in which dewater performance is improved while downsizing of the apparatus is achieved. The filtering apparatus includes a cylindrical or conical inner screen 1 and an outer screen 2 which are concentrically disposed and a spiral fixed wall 3 which is disposed in a filtering room 4 between the inner screen 1 and the outer screen 2. Only the inner screen 1 and/or the outer screen 2 are/is rotated about a shaft center while the spiral fixed wall 3 is not rotated. During this manipulation process, a treated feed is fed into the filtering room 4 from one end of the filtering room 4, thus treated liquid is filtered through the inner screen 1, and is filtered through the outer screen 2, so that each filtrate is discharged to the outside, and a cake is discharged from the other end of the filtering room 4.
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