The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 2005
Filed:
Apr. 28, 2003
Clifford J. Arnett, Columbus, GA (US);
Joseph B. Farrell, Cincinnati, OH (US);
Daniel T. Hull, Iii, Atlanta, GA (US);
Steven J. Krugel, Seattle, WA (US);
Perry L. Schafer, Sacramento, CA (US);
Billy G. Turner, Columbus, GA (US);
Warren R. Uhte, Fort Jones, CA (US);
John L. Willis, Norcross, GA (US);
Clifford J. Arnett, Columbus, GA (US);
Joseph B. Farrell, Cincinnati, OH (US);
Daniel T. Hull, III, Atlanta, GA (US);
Steven J. Krugel, Seattle, WA (US);
Perry L. Schafer, Sacramento, CA (US);
Billy G. Turner, Columbus, GA (US);
Warren R. Uhte, Fort Jones, CA (US);
John L. Willis, Norcross, GA (US);
Columbus Water Works, Columbus, GA (US);
Abstract
A method of treating wastewater sludge includes pumping, continuously, raw sludge into a first digester and treating the raw sludge at a specific temperature of between about 51° C. to 60° C.; transferring the treated wastewater sludge to a batch tank; treating the wastewater sludge in the batch tank, anaerobically, at a thermophilic temperature which is not more than 2° C. warmer than the specific temperature in the first digester; and disposing of the treated wastewater sludge as a Class A biosolid. A wastewater sludge treatment system includes a first thermophilic digester for treating raw wastewater sludge at a specific temperature in a range of between about 51° C. to 60° C., and discharging a treated wastewater sludge; a batch tank for receiving the treated wastewater sludge discharged from the first digester and for thermophilically treating sludge at a temperature in a range of between about 51° C. to 60° C. and not more than 2° C. warmer than the specific temperature in the first digester, for between about 0.5 hours and 5 hours; and a disposal mechanism for disposing of the treated wastewater sludge as a Class A biosolid.