Solid waste treatment with conversion to gas and anaerobic digestion
AssigneeAnaergia Inc.
InventorsJuan Carlos Josse, Yaniv D. Scherson
Life of this patent
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Abstract
Waste solids are treated by pyrolysis at a temperature over 700 degrees C. to produce char and a gas. The gas is treated in an anaerobic digester. In one system, gas and digestate are brought into contact in a diffusion cone. In another option, headspace gas above the digestate is re-circulated through the digestate, for example by way of an eductor downstream of the diffusion cone.
Claims8
A process comprising steps of,
- a) producing a gas containing hydrogen and carbon monoxide from pyrolysis of a feedstock at a temperature of over 750 degrees C.;
- and,
- b) adding the gas to an anaerobic digester,
- wherein the feedstock comprises plastic.
An apparatus for transferring syngas to digestate comprising a diffusion cone in a sidestream loop wherein the diffusion cone defines an outer surface of part of the sidestream loop with a downwardly increasing cross sectional area.
A process for treating wastewater comprising,
- a) treating the wastewater to generate a sludge;
- b) feeding the sludge to an anaerobic digester to produce biogas and digestate;
- c) dewatering the digestate to produce a cake;
- d) thermally drying the cake to produce a dried cake;
- e) pyrolysing the dried cake at a temperature of over 700 degrees C. or more to produce char and syngas;
- f) feeding the syngas to the anaerobic digester;
- g) monitoring one or more indicators of carbon monoxide inhibition in the anaerobic digester.
Dependencies are inferred from the claim text.