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Method and apparatus for the treatment of particulate biodegradable organic waste

a biodegradable organic waste and treatment method technology, applied in biological water/sewage treatment, biological sludge treatment, multi-stage water/sewage treatment, etc., can solve the problems of inefficient inefficient yokoyama process, and insufficient solubilization or liquid removal, etc., to achieve more efficient anaerobic digestion, reduce the volume of particulate biodegradable organic waste, and save volume requirements

Inactive Publication Date: 2005-12-15
CH2M HILL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach reduces the volume of waste, produces a methane-rich gas, and allows for efficient composting of residual solids, providing an economically feasible and environmentally sound disposal method while minimizing ammonia and recalcitrant soluble compounds.

Problems solved by technology

Incineration is a costly alternative, skeptically viewed by the Korean public because of environmental concerns.
While Yokoyama provides considerable benefit over conventional landfill or incineration disposal of food wastes, the process taught by Yokoyama is not energy efficient, nor does it maximize solubilization or liquid removal from residual solid phases.
Further, Yokoyama does not minimize the soluble fraction recalcitrant to biodegradation or ammonia produced from thermal hydrolysis.
Solheim fails to optimize energy usage in the hydrolysis process.
Furthermore, Solheim does not teach any benefit in separating solubilized organics and residual solids before anaerobic digestion.
The bacterial hydrolysis step taught by Shih fails to provide sufficient solubilization and solids dewatering potential to minimize the volume of residual solids.
It, therefore, is not fully effective at minimizing the volume of solid wastes which must be disposed of.

Method used

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  • Method and apparatus for the treatment of particulate biodegradable organic waste
  • Method and apparatus for the treatment of particulate biodegradable organic waste
  • Method and apparatus for the treatment of particulate biodegradable organic waste

Examples

Experimental program
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examples

[0032] The following examples are provided for illustrative purposes only and are not intended to limit the scope of the invention.

Test Material:

[0033] A number of bench tests were conducted to evaluate the efficacy of hydrolyzation under various operating conditions and anaerobic digestion of the solubilized organics under different operating conditions. The feed stocks used in the examples below were taken from food waste obtained from Korean restaurants in the Seattle metropolitan area. Approximately 80 gallons of food waste was collected from three Korean restaurants and maintained in cold storage. Two heavy-duty household (“garbage”) grinders were used to grind the particulate waste to approximately 3 / 16″ or less sized particles. After the food waste was ground, it was put into two 50-gallon coated steel drums designated as Sample A and Sample B. Sample A was used for the first 9 hydrolysis treatability tests (cooks 1-9) and Sample B was used for cooks 10-19, which are descr...

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Abstract

A method for treating particulate biodegradable organic waste includes adjusting the pH as necessary to provide an acidic pH prior to introducing the waste to a thermal hydrolysis reactor and hydrolyzing the waste at a temperature of about 130° C. or greater and a pressure greater than the saturated water vapor pressure to produce a slurry including solubilized organic material and residual solids. The solubilized organic material is separated from the residual solids using a liquid / solid separator and the solubilized organics are subjected to anaerobic digestion to produce a methane gas. The method may further include preheating the particulate biodegradable organic waste with latent heat of the separated solubilized organic material prior to thermal hydrolysis.

Description

RELATED APPLICATIONS [0001] This application is a continuation of U.S. patent application Ser. No. 10 / 286,454, filed Oct. 31, 2002, entitled “Method And Apparatus For The Treatment Of Particulate Biodegradable Organic Waste,” which claims priority from U.S. Provisional Patent Application Ser. No. 60 / 339,846, filed on Nov. 16, 2001, entitled “Method and Apparatus for the Thermal Hydrolysis and Anaerobic Treatment of Particulate Biodegradable Organic Waste” and from U.S. Provisional Patent Application Ser. No. 60 / 366,389, filed on Mar. 21, 2002, entitled “Method and Apparatus for the Thermal Hydrolysis and Anaerobic Treatment of Particulate Biodegradable Organic Waste,” each of which in incorporated by reference herein.FIELD OF THE INVENTION [0002] This invention is directed to a method for the treatment of particulate biodegradable organic waste, and more particularly to a method and apparatus for the thermal hydrolysis and anaerobic treatment of particulate biodegradable organic was...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C05F5/00C05F17/00C02F3/28C02F11/18B09B3/00C02F1/02C02F9/00
CPCB09B3/00Y02A40/209C02F1/66C02F3/28C02F3/286C02F9/00C02F11/18C05F5/00C05F17/0027C05F17/0045C12M21/04C12M45/04C12M45/06C12M45/20C02F1/025Y02P20/145Y02W30/43Y02E50/343C12M45/02Y02W30/47C05F7/00C05F11/00C05F17/10C05F17/50Y02A40/20Y02E50/30Y02W30/40C02F11/02
Inventor LEE, JOHN W. JR.
Owner CH2M HILL
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