Anaerobic sludge digester

Details Anaerobic sludge digester Anaerobic sludge digester

2007-02-06

2007-02-06

Barry, Chester T. (Department: 1724)

Liquid purification or separation

Processes

Treatment by living organism

C210S194000, C210S497010

Reexamination Certificate

active

10682050

ABSTRACT:
An egg-shaped anaerobic sludge digester has upper and lower draft tubes, and an optional middle draft tube. The draft tubes are arranged so that liquid can be (1) simultaneously pumped downwards through the upper (or middle) draft tube and upwards through the lower (or middle) draft tube; (2) simultaneously pumped upwards through two or more draft tubes; or (3) simultaneously pumped downwards through two or more draft tubes. When a middle draft tube is provided, it can be used in place of the upper draft tube when the liquid surface in the digester falls below the top of the upper draft tube. Alternatively, the middle draft tube can work as a coordinated relay conduit to move liquid either in the same direction as the upper draft tube or to move liquid in the same direction as the lower draft tube.

REFERENCES:
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patent: 5409610 (1995-04-01), Clark
patent: 5605653 (1997-02-01), DeVos
patent: 5779890 (1998-07-01), Bailey
patent: 5942116 (1999-08-01), Clark et al.
patent: 6454944 (2002-09-01), Raven
patent: 2002/0192809 (2002-12-01), Lanting et al.
patent: 08033900 (1996-02-01), None
patent: 2005185886 (2005-07-01), None

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