Patent ID: 7458325
Filing Date: 2008-12-02
Classification: F23G

Abstract:
1. A process for thermally treating bio-solids, comprising the steps of: heating a first lot of bio-solids in a first rotatable container such that organic compounds present therein volatilize and combust and moisture present is driven off the first lot of bio-solids to form a first lot of thermally treated bio-solids and a first volume of hot gases and fines; removing the first lot of thermally treated bio-solids from the first container, transporting the first volume of hot gases and fines to a second rotatable container and introducing a second lot of bio-solids to the second rotatable container, and contacting the first volume of hot gases and fines with the second lot of bio-solids in the second rotatable container, the second lot being in an amount sufficient to simultaneously cool the gases and fines in the first volume to a desired temperature while heating the second lot of bio-solids such that organic compounds present therein volatilize and combust and moisture present is driven off the second lot of bio-solids to form a second lot of thermally treated bio-solids and a second volume of hot gases and fines; separating the hot gases from the fines in the second volume; and removing the second lot of thermally treated bio-solids from the second rotatable container.