| 摘要 |
A method is described for the treatment of animal wastes which facilitates the bacterial decomposition of the waste without many of the economic and operational hindrances of conventional waste treatment. According to the invention, an aqueous medium containing the animal waste is prepared and a foam stabilizer such as a surface active agent or a protective colloid is added to the resulting aqueous medium. The aqueous medium is then foamed into a stable foam with air in the discontinuous phase surrounded by the continuous aqueous medium. Preferably, the medium is innoculated with a bacterial culture before foaming. The foam is then discharged into the fermentation vessels where it is retained for a sufficient period of time, e.g., from about 3 to about 48 hours at a temperature from about 15 DEG to about 60 DEG C. to permit substantially complete bacterial decomposition of the animal waste products. Upon completion of the fermentation, the foam composition is removed from the fermentation vessel and a clear, aqueous effluent is separated for recycle in the process or for discharge. The bacterial cells can be concentrated from the aqueous medium by various solid-liquid separators and finally dried to recover cellular matter containing approximately 60 percent protein.
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