Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2005-06-14
2005-06-14
Prince, Fred G. (Department: 1724)
Liquid purification or separation
Processes
Treatment by living organism
C210S613000, C210S631000, C210S173000, C210S181000, C210S198100, C210S205000, C210S259000, C435S262500, C071S010000
Reexamination Certificate
active
06905600
ABSTRACT:
A method for treating particulate biodegradable organic waste includes sizing the waste and adding a base prior to introducing the waste to a thermal hydrolysis reactor and hydrolyzing the waste at a temperature of about 130° C. or greater and a pressure greater than the saturated water vapor pressure to produce a slurry including solubilized organic material and residual solids. The solubilized organic material is separated from the residual solids using a liquid/solid separator and the solubilized organics are subjected to anaerobic digestion to produce a methane gas. The base is preferably potassium hydroxide (KOH) at a concentration of about 1%. The method may further include preheating the particulate biodegradable organic waste with latent heat of the separated solubilized organic material prior to thermal hydrolysis.
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CH2M Hill Inc.
Prince Fred G.
Swanson & Bratschun LLC
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