Organics recovery from dry fraction

Patent metadata

Field	Value
Publication number	US-11613484-B2
Application number	US-201615167324-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	May 29, 2015
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

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 solid waste including organic material, the method comprising steps of,
a) extruding or pressing the waste to separate a dry fraction from a wet fraction;
b) diluting the dry fraction with water of digester filtrate;
c) pulverizing or milling the diluted dry fraction, and separating the pulverized or milled diluted dry fraction into (i) a liquid fraction that includes residual organics and (ii) dry fraction rejects by passing the pulverized or milled diluted dry fraction to a screen that retains the dry fraction rejects and permits the passage of the liquid fraction while or after pulverizing or milling the diluted dry fraction; and
d) washing the separated dry fraction rejects to remove organic film or organics.

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

3. The method of claim 1 wherein the residual organics are treated in an anaerobic digester.

4. The method of claim 1 wherein wash water produced from washing the dry fraction rejects is treated by anaerobic digestion.

5. The method of claim 1 , wherein extruding or pressing the waste is performed at a pressure from 50 to 180 bar.

6. The method of claim 1 , wherein the wet fraction comprises over 80% of the organic material.

7. The method of claim 6 , wherein the wet fraction comprises over 90% of the organic material.

8. The method of claim 1 , wherein the solid waste is: source separated organics, commercial waste, industrial waste, or any combination thereof.

Assignees

• Anaergia Inc

Inventors

• Josse Juan Carlos
• Benedek Andrew
• Scherson Yaniv D

Classifications

• Y02E50/30

  Fuel from waste, e.g. synthetic alcohol or diesel · CPC title

• Y02A40/20

  Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses · CPC title

• C02F11/122 Primary

  using filter presses (C02F11/123 takes precedence) · CPC title

• Y02P20/145

  the feedstock being materials of biological origin · CPC title

• C02F3/28

  Anaerobic digestion processes · CPC title