Method of producing biogas and compost

Details Method of producing biogas and compost Method of producing biogas and compost

1984-11-07

1986-01-21

Woo, Jay H.

Gas: heating and illuminating

Processes

Fuel mixtures

71 9, 71 10, 210603, 210607, 210613, 210630, 435167, 435801, C02F 330, C05F 1108, C12P 502

Patent

active

045655529

ABSTRACT:
In the mesophile production of biogas, the temperature of the liquid used during anaerobic, methanogenic, fermentation is raised to the required temperature (about 35.degree. C.) by aerobically prefermenting solid substrate at substantially ambient temperature and of appropriate moisture content to raise its temperature to a temperature greater than that required for the anaerobic, methanogenic, fermentation. Thereafter flooding the fermenting solid substrate with the liquid at substantially ambient temperature to increase the temperature of the liquid by heat exchange, and then removing the liquid and storing it in a heat insulated environment to reduce the moisture content of the solid substrate to a suitable degree. The above steps of aerobic prefermenting and flooding are repeated until the liquid has reached the required temperature, and then leaving the liquid in situ to enable anaerobic methanogenic fermentation to take place. In so doing the supply of external heat for the initial warming up of the substrate may be dispensed with, thereby improving the efficiency of the method.

REFERENCES:
patent: 1456557 (1923-05-01), Imhoff
patent: 1930457 (1933-10-01), Pruss
patent: 2315577 (1943-04-01), Bach
patent: 2572767 (1951-10-01), Schlenz
patent: 2875151 (1959-02-01), Davidson
patent: 3933628 (1976-01-01), Varani

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