Decontamination Using a One Atmosphere Uniform Glow Discharge Cold Plasma

Decontamination Using a One Atmosphere Uniform Glow Discharge Cold Plasma
Author:
Publisher:
Total Pages: 29
Release: 2002
Genre:
ISBN:

Atmospheric Glow Technologies is developing an innovative mobile atmospheric plasma decon system based upon the patented one atmosphere uniform glow discharge plasma (OAUGDP) technology. This advanced system will be a deployable military protection system that will decontaminate highly toxic chemicals and microorganisms on sensitive equipment, personnel protective equipment, and aircraft, vehicle, and shelter interiors. Phase I efforts demonstrated feasibility of the system in the neutralization of chemical warfare simulants (99.3% reduction). Phase II efforts will extend studies to biological warfare agents including spores, building upon the proven efficacy of the OAUGDP against a wide range of microorganisms. Future work will involve optimizing the system for recirculation of the airflow and air cooling. Studies are currently underway to determine the concentration of atmospheric plasma produced active species as well as the extent of chemical and biological degradation achieved. The system will also be tested for materials and device compatibility as well as neutralization studies of actual chemical and biological warfare agents.

Decontamination and Sterilization of Surfaces by Means of a One Atmosphere Uniform Glow Discharge Plasma

Decontamination and Sterilization of Surfaces by Means of a One Atmosphere Uniform Glow Discharge Plasma
Author:
Publisher:
Total Pages: 49
Release: 2000
Genre:
ISBN:

Decontamination of surfaces that have been exposed to biological agents must be accomplished quickly under battlefield conditions. Current decontamination processes utilize corrosive solutions. which require careful handling and can damage the equipment that must be treated. A simple. fast-acting. and safe method for equipment decontamination would minimize equipment downtime and minimize the number of personnel needed. It has been demonstrated that exposure of microorganisms to gas discharge plasma reaction products leads to their destruction. In particular. an air stream. treated by the One Atmosphere Uniform Glow Discharge Plasma (OAUGDP). has been shown to destroy microorganisms in a time frame of tens of seconds. Simulants of biological agents coating surfaces similar to military equipment were exposed to the OAUGDP reactor under various operating parameters. Exposure time was the principal variable. The performance of the OAUGDP reactor applied to several types of microorganism was evaluated. All microorganisms used were destroyed within seconds to minutes of plasma exposure. The results indicate that the OAUGDP can be successfully used for military biological decontamination. The OAUGDP reactor is especially useful for the decontamination of sensitive equipment. which would be harmed by chemical washes.

Utilizing A One-Atmosphere Uniform Discharge Plasma for Bio/Chem Agent Sterilization/Decon

Utilizing A One-Atmosphere Uniform Discharge Plasma for Bio/Chem Agent Sterilization/Decon
Author: Malcolm McLean
Publisher:
Total Pages: 21
Release: 1998
Genre:
ISBN:

Initial experimental results demonstrated that the One Atmosphere Uniform Glow Discharge Plasma (OAUGDP) will cause structural changes in simulants for chemical agents. Phase I results established "proof of concept", that is, that the active species generated by the OAUGDP will react with and cause structural changes in chemical agent simulants. This was demonstrated using the simulant methyl salicylate (oil of wintergreen). Gas chromatography/mass spectrometry results indicate the formation of a new species with a molecular weight 16 amu greater than methyl salicylate. Based partially on this, the plasma active species is postulated to be atomic oxygen. It should be noted that methyl salicylate does not appear to react with ozone gas under standard temperature and pressure conditions. Also arising from the Phase I work is the elucidation of three distinct theories covering electrohydrodynamic (EHD) methods of neutral gas flow control. The theories are comprehensively discussed in the theoretical results section of this report. EHD flow control was developed during the Phase I work and was supported in part by Phase I funds.

Optimization of the Mod-VIII One Atmosphere Uniform Glow Discharge Plasma Reactor® for Surface Energy Treatment

Optimization of the Mod-VIII One Atmosphere Uniform Glow Discharge Plasma Reactor® for Surface Energy Treatment
Author:
Publisher:
Total Pages: 72
Release: 2006
Genre:
ISBN:

A plasma reactor system has been developed to provide roll-to-roll surface treatment of fabrics and films using an air plasma. Effects of air plasma surface treatment at one atmosphere can include etching, cleaning, sterilization, disinfection, and increasing surface energy, all without the use of chemical inputs and with minimal toxic by-products. Webs can be continuously and uniformly treated by proper control of gas flow, electrode configuration, plasma parameters, fabric speed, and fabric tension. Tests conducted in this work focused on raising the surface energy of PET and HDPE using various electrode configurations. For industrial applications, the exposure time required to make the surface wettable (having a contact angle less than 20 degrees) should be one second or less. The reactor system was tested with a variety of electrode geometries, two of the more successful of which were a variable gap curved-to-flat plate geometry that consists of a rotating, grounded, stainless steel drum in combination with a flat transparent upper electrode. In this configuration, a One Atmosphere Uniform Glow Discharge Plasma(OAUGDP)® exists at the minimum gap, but tends to transition to a filamentary glow discharge as the gap widens. This filamentation was minimized by proper gas flow and adjustment of the dielectric barrier configuration, reducing any negative impact on processing results. When a transparent electrode configuration is in use, the phenomenology of this unique plasma volume can be studied in situ in both the normal and transverse directions with respect to the electric field. Results are compared to previous experiments conducted in the Plasma Sciences Laboratory using static sample exposure, including effects of the exposure duration time and the ageing effect. Contact angle measurements based on the sessile water drop test were conducted to confirm proper operation and uniformity of effect.

Cold Plasma

Cold Plasma
Author: MDPI
Publisher: MDPI
Total Pages: 184
Release: 2021-01-20
Genre: Medical
ISBN: 3039366033

Non-equilibrium plasma (or low-temperature plasma, LTP) offers a chemically rich medium without the need for high power and elevated temperatures. This unique characteristic has made LTP very useful for various industrial and biomedical applications where thermal effects are not desirable. In addition, the relative simplicity of the design of sources capable of generating non-equilibrium plasma at atmospheric pressure makes LTP a very attractive technology that can accomplish the same or better results than much more complex and expensive approaches. This book describes various low-temperature plasma sources and some of their environmental and biomedical applications. The plasma sources covered in this book include low-temperature plasma jets which are novel devices that can launch low-power, low-temperature plasma plumes in ambient air. These plasma plumes can accurately and reliably be aimed at a surface to be treated or at a biological target such as cells and tissues. The application of these plasma jets in medicine, including in cancer therapy, are thoroughly discussed in this book. The contents of this book will appeal to engineers, medical experts, academics, and students who work with plasma technology.

Microbial Decontamination in the Food Industry

Microbial Decontamination in the Food Industry
Author: Ali Demirci
Publisher: Elsevier
Total Pages: 841
Release: 2012-06-26
Genre: Technology & Engineering
ISBN: 0857095757

The problem of creating microbiologically-safe food with an acceptable shelf-life and quality for the consumer is a constant challenge for the food industry. Microbial decontamination in the food industry provides a comprehensive guide to the decontamination problems faced by the industry, and the current and emerging methods being used to solve them.Part one deals with various food commodities such as fresh produce, meats, seafood, nuts, juices and dairy products, and provides background on contamination routes and outbreaks as well as proposed processing methods for each commodity. Part two goes on to review current and emerging non-chemical and non-thermal decontamination methods such as high hydrostatic pressure, pulsed electric fields, irradiation, power ultrasound and non-thermal plasma. Thermal methods such as microwave, radio-frequency and infrared heating and food surface pasteurization are also explored in detail. Chemical decontamination methods with ozone, chlorine dioxide, electrolyzed oxidizing water, organic acids and dense phase CO2 are discussed in part three. Finally, part four focuses on current and emerging packaging technologies and post-packaging decontamination.With its distinguished editors and international team of expert contributors, Microbial decontamination in the food industry is an indispensable guide for all food industry professionals involved in the design or use of novel food decontamination techniques, as well as any academics researching or teaching this important subject. Provides a comprehensive guide to the decontamination problems faced by the industry and outlines the current and emerging methods being used to solve them Details backgrounds on contamination routes and outbreaks, as well as proposed processing methods for various commodities including fresh produce, meats, seafood, nuts, juices and dairy products Sections focus on emerging non-chemical and non-thermal decontamination methods, current thermal methods, chemical decontamination methods and current and emerging packaging technologies and post-packaging decontamination

Plasma Assisted Decontamination of Biological and Chemical Agents

Plasma Assisted Decontamination of Biological and Chemical Agents
Author: Selçuk Güçeri
Publisher: Springer Science & Business Media
Total Pages: 306
Release: 2011-10-12
Genre: Science
ISBN: 1402084390

Plasma decontamination is a rapidly expanding area of modern science and engineering. An increasing number of engineers are using plasma methods for decontamination of chemical and biological agents. Plasma decontamination is effectively applied today to clean and sterilize different surfaces, high volume air and water streams, industrial exhausts, and even living tissue of animals and humans. This book provides a fundamental introduction to virtually all aspects of modern plasma decontamination, as well as the most recent technological achievements in the area. The book is segmented into four specific sections of modern plasma decontamination: (1) plasma bio-decontamination, including disinfection and sterilization of surfaces, water and air streams; (2) plasma decontamination of chemical agents, including cleaning of air, water, and industrial exhaust gases from different pollutants and especially volatile organic compounds VOC; (3) plasma treatment of living tissue, including different subjects of plasma medicine from skin sterilization to tissue engineering; (4) major electric discharges applied for the plasma-assisted decontamination of chemical and biological agents.

Decontamination of Fresh and Minimally Processed Produce

Decontamination of Fresh and Minimally Processed Produce
Author: Vicente M. Gómez-López
Publisher: John Wiley & Sons
Total Pages: 577
Release: 2012-05-01
Genre: Technology & Engineering
ISBN: 0813823846

Attempts to provide safer and higher quality fresh and minimally processed produce have given rise to a wide variety of decontamination methods, each of which have been extensively researched in recent years. Decontamination of Fresh and Minimally Processed Produce is the first book to provide a systematic view of the different types of decontaminants for fresh and minimally processed produce. By describing the different effects – microbiological, sensory, nutritional and toxicological – of decontamination treatments, a team of internationally respected authors reveals not only the impact of decontaminants on food safety, but also on microbial spoilage, vegetable physiology, sensory quality, nutritional and phytochemical content and shelf-life. Regulatory and toxicological issues are also addressed. The book first examines how produce becomes contaminated, the surface characteristics of produce related to bacterial attachment, biofilm formation and resistance, and sublethal damage and its implications for decontamination. After reviewing how produce is washed and minimally processed, the various decontamination methods are then explored in depth, in terms of definition, generation devices, microbial inactivation mechanisms, and effects on food safety. Decontaminants covered include: chlorine, electrolyzed oxidizing water, chlorine dioxide, ozone, hydrogen peroxide, peroxyacetic acid, essential oils and edible films and coatings. Other decontamination methods addressed are biological strategies (bacteriophages, protective cultures, bacteriocins and quorum sensing) and physical methods (mild heat, continuous UV light, ionizing radiation) and various combinations of these methods through hurdle technology. The book concludes with descriptions of post-decontamination methods related to storage, such as modified atmosphere packaging, the cold chain, and modeling tools for predicting microbial growth and inactivation. The many methods and effects of decontamination are detailed, enabling industry professionals to understand the available state-of-the-art methods and select the most suitable approach for their purposes. The book serves as a compendium of information for food researchers and students of pre- and postharvest technology, food microbiology and food technology in general. The structure of the book allows easy comparisons among methods, and searching information by microorganism, produce, and quality traits.

Sttr-97 Sterilization and Decontamination of Matter with a One Atmospheric Glow Discharge

Sttr-97 Sterilization and Decontamination of Matter with a One Atmospheric Glow Discharge
Author: Battle Glascock
Publisher:
Total Pages: 27
Release: 1998
Genre:
ISBN:

The investigation into the sterilization and decontamination of matter with one atmospheric glow discharge yielded many new direction for this unique technology. Our original direction for the project was to design and build a prototype atmospheric glow discharge system to allow for the treatment of various pathogenic microorganisms. The primary goals were to determine the minimum power density to required sterilization using various gas mixtures and media types. Various atmospheres and power settings were used to determine the feasibility of this systems use and its potential for field operations in a portable sterilization and decontamination system.