Maro Publications

Disposal

Patent Abstracts

*10/30/2013
from 8/14/2012

Maro Topics

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Patent Abstracts

2. 8,518,324 
Microwave remediation of medical wastes

Medical wastes, e.g., infectious hospital medical wastes, represent a major component of hazardous wastes generated in the U.S. annually. In 2000, the U.S. generated more than 4.5 million tons of medical wastes. The method used most widely for their disposal continues to be incineration. Incineration suffers from problems of high handling, packaging and transportation costs, residual environmental pollution, high overall cost and severe local opposition. Those problems have been exacerbated by the provisions of the Clean Air Act of 1990. Alternatives to incineration, such as on-site autoclaving and shred-and-steam (with the steam generated by microwaves) suffer from similar drawbacks.

In current practice, medical wastes in hospitals, physicians' offices, medical labs, or other medical settings are currently segregated at the point of generation as "bio-medical waste", "bio-hazard (sharps)" and regular non-infective trash. Those medical wastes are then collected and transported to a centralized facility. From there, part of the medical wastes, typically about 35%, are treated by microwave-steam methods in very large, plant-like facilities set up in large, dedicated rooms or in multiple, mobile tractor-trailers (e.g. those offered by Stericycle Inc (Lake Forest, Ill.) or Sanitec Inc (Sun Valley, Calif.)). The remaining medical waste is transported off-site, frequently to another state or province, for incineration in very large incineration facilities. The entire centralized collection methodology entails a large overhead with, e.g., specialized training required for the medical waste transporters.

Microwave chemistry and biology utilize microwave radiation, frequently from domestic (2.45 GHz) microwave ovens, to take the place of heat reflux or catalysts in carrying out organic and inorganic reactions. Reactions that may take days under thermal reflux at high temperatures can be completed in under an hour and sometimes in minutes under microwave radiation.

Chandrasekhar of Ashwin-Ushas Corporation, New Jersey, developed a remediation of medical wastes a using a wave active fluid, a microwave enhancer, and a viscosity modifying agent. Methods include immersing medical waste in the remediation composition and then irradiating the medical waste and the remediation composition to remediate the medical waste. The devices include a container for the medical waste and the remediation composition, a microwave radiation source and a temperature monitoring device. (RDC 8/28/2013)

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1. 8,240,258 
Burner for waste plastic
 
Bang and Patti of South Korea and California, developed a burner which uses solid fuels, especially waste plastic fuels.  Burner size is minimized by having multiple combustion chambers concentrically located around a rotating screw conveyor.  Heat efficiency is improved by having air passages disposed around the combustion chambers, thus preheating air for the combustion prior to its delivery to the combustion chambers, while simultaneously thermally insulating the combustion chambers against the environment.  Waste plastic is transported from a fuel hopper to the combustion chambers by a rotating screw conveyor having the spiraling auger blades.  Speed of screw conveyor rotation controls the consumption of waste plastic and, thus, the amount of thermal energy generated in the burner. (RDC 8/14/2012)

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Interested!!
Bookmark this page to follow future developments!.
(RDC 6/5/2012)

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Roger D. Corneliussen
Editor
www.maropolymeronline.com

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921
E-Mail: cornelrd@bee.net  

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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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** Date of latest addition; date of first entry is 8/14/2012.