Liquid purification or separation – Processes – Treatment by living organism
Patent
1982-11-26
1985-01-15
Bashore, S. Leon
Liquid purification or separation
Processes
Treatment by living organism
48111, 48197A, 48209, 210180, 210604, 210630, 435167, 435289, 435311, 435316, C02F 1102, C02F 1104, C02F 330
Patent
active
044937709
ABSTRACT:
Heat can be recovered by biological generation of heat upon aeration of refuse, such as garbage or sludge, in an aeration vessel (11) by introducing oxygen-containing gas, such as air, in a closed cycle (11, 33, 31, 35) to thereby enrich gas withdrawn from the vessel with the oxygen, typically by reintroduction of gas withdrawn from an upper gas portion (43) of the vessel, after introduction of additional oxygen, for example controlled by a valve (65) into a lower portion of the contents of the aeration chamber. Control can be effected automatically, by a control unit (55, 55') through a valve (51, 51') or manually; automatic control can be effected, for example, by sensing oxygen or carbon dioxide concentration by suitable sensors (57, 59) within the vessel. To permit recovery of methane of high quality in a subsequent decomposition and methane recovery container, material withdrawn from the aeration vessel is degassed in degassing chambers (68; 69, 70), for example by storage for about 1/2 hour, and venting of emanating gases. Control of valves regulating flow from, and to, the aerating vessel and the degassing chambers (69, 70) permits preheating of freshly introduced refuse by the material withdrawn from the degassing chambers in a counterflow heat exchanger (17'), while preventing possible escape of non-aerated substances from the vessel (11) by isolating the aeration vessel (11) during introduction of new refuse, and emptying only a chamber (e.g. 69) of said degassing chamber system (68).
REFERENCES:
patent: 3724667 (1973-04-01), McKinney
patent: 3981800 (1976-09-01), Ort
patent: 4062770 (1977-12-01), Kneer
patent: 4071443 (1978-01-01), Gorski et al.
patent: 4207180 (1980-06-01), Chang
patent: 4246099 (1981-01-01), Gould et al.
Bashore S. Leon
Hastings K. M.
UTB Umwelttechnik Buchs AG
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