Hazardous or toxic waste destruction or containment – Processes for making harmful chemical substances harmless,... – By hydropyrolysis or destructive steam gasification – e.g.,...
Reexamination Certificate
2011-06-28
2011-06-28
Mayes, Melvin C (Department: 1732)
Hazardous or toxic waste destruction or containment
Processes for making harmful chemical substances harmless,...
By hydropyrolysis or destructive steam gasification, e.g.,...
C588S318000, C588S405000
Reexamination Certificate
active
07968760
ABSTRACT:
A method of treating particulate biodegradable organic waste by thermal hydrolysis. The method includes subjecting a quantity of the particulate biodegradable waste to thermal hydrolysis at a temperature above about 130° C. and a pressure at or above the saturated water vapor pressure to produce a slurry. The slurry will include solubilized organic material and unhydrolyzed residual solids. The method further includes decreasing the pressure at which the slurry is maintained. Typically, the step of decreasing slurry pressure will occur in a flash tank, which allows the separation of an organic acid-rich steam from other hydrolysis products. The method further includes capturing the steam or other condensable gases released when pressure is decreased and condensing the steam or other condensable gases into a condensate. The captured condensate may then be added to a quantity of particulate biodegradable waste prior to thermal hydrolysis. Also disclosed is an apparatus for practicing the method described above.
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CH2M Hill Inc.
Davis Sheng H
Dorsey & Whitney LLP
Mayes Melvin C
LandOfFree
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