Production of biogas from organic materials

Patent metadata

Field	Value
Publication number	US-9879285-B2
Application number	US-201615085381-A
Country	US
Kind code	B2
Filing date	Mar 30, 2016
Priority date	Jul 20, 2015
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

Waste or organic material is compressed at a pressure sufficient to burst cells, for example 50 bar or more, and separated into a dry fraction and a wet fraction. The wet fraction is treated in an anaerobic digester to produce biogas after removing grit. The wet fraction is diluted, preferably with sludge, before it is degritted. Optionally, floatables are removed from the fraction before it is added to the digester.

First claim

We claim:

1. A process comprising steps of,
pressing solid waste containing organic material to separate the solid waste into a wet fraction containing organic material that is compressed through perforations in a wall of a compression chamber and a dry fraction;
diluting the wet fraction;
degritting the wet fraction; and,
treating the wet fraction in an anaerobic digester.

2. The process of claim 1 wherein floatables are removed from the wet fraction in a dynamic cyclone.

3. The process of claim 1 wherein degritting is performed with a hydrocyclone.

4. The process of claim 1 wherein the wet fraction is diluted to 8-12% solids.

5. The process of claim 1 wherein the wet fraction is diluted with sludge.

6. The process of claim 1 wherein the wet fraction is co-digested with WWTP sludge.

7. The process of claim 1 wherein floatables are removed from the wet fraction.

8. The process of claim 1 wherein the solid waste is pressed at a pressure of at least 50 bar.

9. The process of claim 1 wherein the solids waste is pressed at a pressure sufficient to rupture cells in the organic material.

10. The process of claim 1 wherein the perforations have a size in the range of 4-10 mm.

11. The process of claim 1 wherein the wet fraction has a solids content of at least 20%.

12. The process of claim 1 wherein the solid waste comprises municipal solid waste and the wet fraction is at least 30% of the solid waste.

13. The process of claim 1 wherein the solid waste comprises source separated organics and the wet fraction is at least 70% of the solid waste.

Assignees

• Anaergia Inc

Inventors

• De Lima Vasconcellos Marcelo
• Josse Juan Carlos

Classifications

• C02F11/04

  Anaerobic treatment; Production of methane by such processes · CPC title

• Y02W30/47

  Cross-Sectional Technologies · mapped topic

• B09B3/00

  Destroying solid waste or transforming solid waste into something useful or harmless · CPC title

• C12M21/04

  for producing gas, e.g. biogas (digesters for manure with production of biogas A01C3/028, biological treatment of water, waste water or sewage C02F3/00, C02F11/02, preparation of natural gas or syngas C10L3/06, C10L3/10) · CPC title

• C12M45/02

  by mechanical forces; Stirring; Trituration; Comminuting (crushing, pulverizing, disintegrating in general B02C) · CPC title