Anaerobic digestion process

Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow

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48197A, 71 10, 195 33, 210 12, 210 16, C02C 114

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active

040409538

ABSTRACT:
The present invention relates to the manufacture of high calorific fuel gas through a process of anaerobic digestion involving retention of a slurry of organic material, maintained at a predetermined volume-to-interface (V/I) ratio and for a desired liquid retention time, pH and temperature to produce substantial amounts of methane gas while minimizing the production of carbon dioxide gas. When operating in the preferred range of volume-to-interface (V/I) relationships, the faster molecular diffusion rate of methane from the slurry as compared with carbon dioxide gas allows virtually all of the methane to be collected from the slurry while a considerably smaller amount of carbon dioxide gas is collected. Instead, the bulk of the carbon dioxide remains in the spent slurry which is transferred as sludge to a loop for carbon dioxide stripping. Liquid retention is controlled by a recirculation-stripping loop. Stripping of the carbon dioxide from the sludge in this loop is greatly improved by adjustment of pH with acid.

REFERENCES:
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patent: 3981800 (1976-09-01), Ort
Sen et al., "Anaerobic Digestion of Liquid Molasses Distillery Wastes," WPCFJ, Oct. 1962, pp. 1015-1025.

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