Steam treatment of municipal solid waste

• US 5,556,445 A
• Filed: 09/22/1994
• Issued: 09/17/1996
• Est. Priority Date: 04/08/1991
• Status: Expired due to Fees

• Current Assignee: Mark K. Quinn
• Original Assignee: Mark K. Quinn
• Inventors: Quinn, Mark K., Unangst, Bruce E.
• Primary Examiner(s): Popovics, Robert J.
• Application Number:
  US08/310,574
• Time in Patent Office: 726 Days
• Field of Search: 71/8-14, 71/901, 210/770, 210/771, 210/774, 210/808, 210/784, 422/26, 422/209, 209/11, 209/238, 209/240, 209/284, 209/288, 209/930
• US Class Current: 71/11
• CPC Class Codes: A61L 11/00 Methods specially adapted for refuse disintegrating medical waste B02C19/0075; disposal of medical waste B09B3/00
• CPC Class Codes: B03B 9/06 specially adapted for refuse
• CPC Class Codes: B09B 3/00 Destroying solid waste or transforming solid waste into something useful or harmless
• CPC Class Codes: B09B 3/40 involving thermal treatment, e.g. evaporation processes using mineral binders involving a melting or softening step B09B3/29; involving radiation B09B3/50
• CPC Class Codes: Y10S 209/93 Municipal solid waste sorting
• CPC Class Codes: Y10S 71/901 Refuse conditioning

Abstract

A method for treating solid municipal waste material including placing solid municipal waste in a rotating chamber having an interior at ambient pressure, heating the waste at ambient pressure, and controlling the moisture content of the waste.

Claims

1. A method for treating solid municipal waste material containing inorganic and organic waste comprising:

a. feeding said waste material into a rotatable chamber having a first end for receiving said waste material and a second end for discharging waste material from said rotatable chamber, said rotatable chamber being open to the atmosphere,

b. adding water to said rotatable chamber,

c. heating said waste material in said chamber from about 10 minutes to about 90 minutes while rotating said rotatable chamber by injecting steam at a temperature of from about 212 degrees F. to about 500 degrees F. into said rotatable chamber to heat said waste material to a temperature of from about 212 degrees F. to about 500 degrees F. to sterilize waste material and soften said organic waste material,

d. conveying said waste material through said rotatable chamber and removing treated waste material from said rotatable chamber while said rotatable chamber is rotating and said steam is being injected, and

e. separating a portion of said inorganic waste from said organic waste.