Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2005-06-21
2005-06-21
Prince, Fred G. (Department: 1724)
Liquid purification or separation
Processes
Treatment by living organism
C210S613000, C210S181000, C210S259000
Reexamination Certificate
active
06908555
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.
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Arnett Clifford J.
Farrell Joseph B.
Hull, III Daniel T.
Krugel Steven J.
Schafer Perry L.
Columbus Water Works
Prince Fred G.
Varitz, P. C. Robert D.
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