Pathogen destruction process for biosolids
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United States of America Patent
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Sep 10, 2002
Grant Date -
N/A
app pub date -
Oct 9, 2000
filing date -
Oct 9, 2000
priority date (Note) -
Expired
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Abstract
A method of treating a waste stream comprising feeding a waste stream into a reactor constructed and arranged for a fast start and maintained in a thermophilic temperature regime of between about 50.degree. C. and 62.degree. C. for a HRT of less than or equal to 48 hours, wherein the reactor contents are maintained at a pH less than or equal to 6.5; drawing a portion of the contents of the reactor and feeding the drawn contents into a second reactor which is maintained in a mesophilic temperature regime of between about 28.degree. C. to 38.degree. C. for a HRT of at least thirteen days; and replacing the contents drawn from the first reactor with more waste from the waste stream. Alternately, the waste stream may be initially treated in a mesophilic reactor, followed by treatment in a thermophilic reactor, or a single stage thermophilic reactor may be used.
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