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US 6,113,789 AGranted
Pasteurization process
AssigneeWestern Environmental Engineering Company
InventorDennis A. Burke
Life of this patent
Estimating the term…
Abstract
An anaerobic process for digesting organic waste solids to produce residual solids having low levels of pathogens so as to meet regulatory Class A requirements involves a pasteurization step to reduce pathogen levels and digestion of the pasteurized material to reduce the solids volume.
Claims14
An anaerobic process for digesting organic substrates comprising:
- digesting an organic substrate in a first anaerobic reactor to provide solids and liquid products of digestion;
- forming a sludge having a solids content ranging from about 4 to about 12 weight percent by separating the solids from the liquid products of digestion;
- returning a portion of the sludge to the first anaerobic reactor;
- pasteurizing a portion of the sludge by elevating the temperature of the sludge through the injection of steam into the sludge;
- and
- anaerobically digesting a portion of the pasteurized sludge.
3 more elements
Dependencies are inferred from the claim text.