A - Human Necessities – 23 – K
Patent
A - Human Necessities
23
K
99/34
A23K 1/00 (2006.01)
Patent
CA 1073731
ABSTRACT OF THE DISCLOSURE A biochemical process is provided for the manufacture of a proteinaceous product, useful as a soil additive or as a feed supplement from animal waste and sewage sludge from municipal waste. The process comprises the aerobic microbial treatment of an aqueous suspension of animal waste and includes the introduction of oxygen into the process at a sufficient rate to obtain a maximum digestion rate and a maximum temperature of the aqueous suspension under treatment. Suitable rates are provided by introducing air at a rate of from 0.01 to 0.3 volume air per minute per volume of aqueous suspension under treatment. The suspension is also agitated thoroughly to ensure intimate mixing of the oxygen with the liquid, contributing to optimum thermophilic microbial activity. Preferably the reaction is maintained under adiabatic or near- adiabatic conditions thereby ensuring that the microorganisms that are congene ic in the waste adapt to and remain active at the high treatment temperatures which are employed. If necessary, any increase in pH during the fermentation can be neutralized by the addition of acid. The high temperature also effects pasteurization of the treatment liquid, thereby sterilizing pathogens present therein so that the microorganism cultures can be readily harvested to produce proteinaceous soil additives or feed supplement.
276555
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