Steven Michael Duncan

US Patent:

52176177, Jun 8, 1993

Filed:

Dec 17, 1991

Appl. No.:

7/809006

Inventors:

Steven P. Duncan - Taylorsville UT
Robert C. Emmett - Salt Lake City UT
Gunter H. Brox - Salt Lake City UT
William J. Grove - Salt Lake City UT
Douglas E. Hanify - West Valley City UT

Assignee:

Baker Hughes Incorporated - Houston TX

International Classification:

C02F 320
C02F 322

US Classification:

210620

Abstract:

A transportable apparatus for biological treatment of a slurry of contaminated materials, including a series of square reactor cells having substantially parabolic lower portions, set at the same elevation and communicating in series. Gas diffusers are placed in each cell for aerating and mixing the slurry, and an airlift slurry transport system is employed for recirculating the slurry. The apparatus also has applicability to the treatment of water and waste water.

US Patent:

52271366, Jul 13, 1993

Filed:

Nov 5, 1990

Appl. No.:

7/612585

Inventors:

Douglas E. Hanify - West Valley City UT
Steven P. Duncan - Taylorsville UT
Robert C. Emmett - Salt Lake City UT
Gunter H. Brox - Salt Lake City UT
Lawrence T. O'Connor - Midvale UT

Assignee:

Envirotech Corporation - Menlo Park CA

International Classification:

B01F 716
B01F 718

US Classification:

422225

Abstract:

A reactor vessel for use in treating slurries containing minerals, soils or sludges contaminated with toxic organic substances is disclosed. The vessel includes a tank, having a sealed cover, a mixer arrangement, an air supply arrangement and an exhaust gas recycling system. The air supply arrangement includes one or more porous, flexible membrane diffusers adapted for introducing gas, in the form of fine bubbles, into a tank-contained slurry.