A - Human Necessities – 23 – K
Patent
A - Human Necessities
23
K
71/21, 99/33
A23K 1/00 (2006.01)
Patent
CA 1084762
THERMOPHILIC AEROBIC DIGESTION PROCESS FOR PRODUCING ANIMAL NUTRIENTS AND OTHER DIGESTED PRODUCTS Abstract of the Disclosure Animal waste matter, for example manure produced by hogs, sheep, cattle, chickens and humans is aerobically digested at thermophilic digestion temperatures to produce single cell, proteinaceous material suitable for feeding to animals as part of the animals' nutritive diet. Animal waste matter is introduced into a digesting zone that is sufficiently insulated to prevent any substantial heat loss from the digesting material during the digestion process. An oxygenating gas such as air is introduced into the digesting material during all phases of the digestion. The digesting material is simultaneously vigorously agitated. The waste material is placed into the digester at ambient tempera- tures and is contacted with the oxygenating gas at a rate and is agitated at a level effective to cause thermogenic microbial digestion of the materials present in the waste matter. Since the microbial digestion is thermogenic and because the digester is insulated the temperature of the digestion waste material will rise from ambient to thermophilic digestion temperatures. There- after, the digesting mixture is continuously contacted with the oxygenating gas at a rate and is agitated at a level effective to maintain the thermophilia digestion temperatures for a period of at least four days. In a broader aspect of the present invention, lignocel- lulosic materials, such as woody plants, as well as biochemically degradable organic materials, such as sewage sludges, organic domestic and industrial wastes and animal, vegetable and fruit processing plant wastes, are digested by the thermophilic micro- organisms present in the foregoing process. When the foregoing -1- process has reached thermophilic digestion temperatures, ligno- cellulosic material and biodegradable organic wastes can be placed in the digester, preferably in chipped or finely divided form. The lignin is digested out of the lignocellulosic complex in a period of about four days after placement in the digester, leaving free individual cellulosic cells that can be assimilated by animals. Likewise, biodegradable materials are digested in a similar amount of time. Alternatively, lignocellulosic material or biodegradable material in the form of an aqueous slurry can be placed in a digester with a small quantity of animal waste matter or a thermophilic bacterial culture extracted from the fecal matter digestion process described above. Thereafter the slurry is agitated and aerated in accordance with the foregoing require- ments. The aqueous slurry will gradually rise to thermophilic digestion temperatures and can be maintained at those temperatures to substantially digest the lignin out of the lignocellulosic complex or to digest the biodegradable material, as the case may be. -2-
264811
Coulthard Thomas L.
Saben Hugh S.
Townsley Philip M.
Coulthard Thomas L.
Saben Hugh S.
Smart & Biggar
Townsley Philip M.
LandOfFree
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