Warren R Uhte

US Patent:

20040011718, Jan 22, 2004

Filed:

Apr 28, 2003

Appl. No.:

10/425131

Inventors:

Clifford Arnett - Columbus GA, US
Joseph Farrell - Cincinnati OH, US
Daniel Hull - Atlanta GA, US
Steven Krugel - Seattle WA, US
Perry Schafer - Sacramento CA, US
Billy Turner - Columbus GA, US
Warren Uhte - Fort Jones CA, US
John Willis - Norcross GA, US

Assignee:

Columbus Water Works

International Classification:

C02F011/04
C02F003/00

US Classification:

210/175000, 210/609000, 210/603000, 210/613000

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.