Organics recovery from dry fraction

Patent metadata

Field	Value
Publication number	US-2016346788-A1
Application number	US-201615167324-A
Country	US
Kind code	A1
Filing date	May 27, 2016
Priority date	May 29, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

Solid waste, for example source separated organics (SSO) or commercial and industrial (C&I) waste or both, are treated by first pressurizing the waste against a screen to produce a solids fraction and a liquid fraction. The liquid fraction can be treated in an anaerobic digester. The solids fraction is pulverized or milled, for example with a hammer mill, preferably after being diluted. The pulverized or milled waste is separated again to provide a second solids faction and a second liquid fraction. The liquid fraction can be treated in an anaerobic digester. The solids fraction is primarily inert and can be landfilled, preferably after being washed.

First claim

We claim:

1 . A method of treating waste comprising steps of,
a) extruding or pressing the waste to separate a solids fraction from a liquid fraction; and, b) pulverizing or milling the dry fraction.

2 . The method of claim 1 wherein the liquid fraction is treated in an anaerobic digester.

3 . The method of claim 1 wherein step b) comprises separating the dry fraction into residual organics and dry fraction rejects.

4 . The method of claim 3 wherein the residual organics are treated in an anaerobic digester.

5 . The method of claim 1 further comprising washing the dry fraction rejects.

6 . The method of claim 5 wherein wash water from washing the dry fraction is treated by anaerobic digestion.

7 . An apparatus for treating waste comprising,
a) an extruder or press; and, b) a hammer mill.

8 . The apparatus of claim 7 wherein the hammer mill receives a dry fraction from the extruder or press.

9 . The apparatus of claim 7 further comprising an anaerobic digester.

Assignees

• Anaergia Inc

Inventors

• Josse Juan Carlos
• Benedek Andrew
• Scherson Yaniv D

Classifications

• C05F7/00

  Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses · CPC title

• B30B9/02

  for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material (kitchen equipment A47J; filtering, e.g. straining solids from liquids, using presses in combination with filtering elements B01D; expelling water from textile fabrics or laundry D06C, D06F; drying F26 {; clothes presses D06F69/00, D06F71/00}) · CPC title

• C05F9/04

  Biological compost · CPC title

• B09B5/00

  Operations not covered by a single other subclass or by a single other group in this subclass · CPC title

• C02F3/28

  Anaerobic digestion processes · CPC title