Chlorine Dioxide Decontamination System with Permeable Activation Cup
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Solution Overview
Problem
Existing chlorine dioxide (ClO2) fumigant decontamination systems face challenges such as the production of excess humidity, corrosive by-products, and lack of control over the disinfection process, making them unsuitable for large-scale building decontamination and repeated sterilization tasks, especially in corrosion-sensitive environments.
Innovation Solution
A modular and portable ClO2 decontamination system that generates ClO2 fumigant in situ, minimizing water vapor and acid vapors, with a system comprising a chlorine dioxide fumigant activating area, a bypass flow area, and a neutralizing area, using a permeable activation cup to separate water and by-products, allowing for flexible control over the decontamination process and ensuring sterilization of both large and small objects, including those in sealed packages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ClO2 is produced in acidic solutions of sodium chlorite or sodium chlorate, then effective decontamination is achieved, but excess humidity and corrosive by-products are generated
Solution Approach 1:
The system divides the decontamination process into separate functional zones: a ClO2 generation area where the fumigant is produced, and a neutralizing area where corrosive by-products are treated. This spatial segmentation allows effective decontamination while isolating harmful by-product generation from sensitive areas.
Solution Approach 2:
A neutralizing agent is introduced as an intermediary substance in the neutralizing area to chemically react with and neutralize corrosive by-products (such as hydrochloric acid mist) before they can cause damage to electronic equipment or metallic structures. This mediator enables the use of effective ClO2 generation methods while protecting against their harmful effects.
2Productivity
If ClO2 is transported under pressure or in liquid phase, then transportation efficiency is improved, but explosive risks increase
Solution Approach 1:
The system performs preliminary generation of ClO2 fumigant directly at the decontamination site rather than transporting it. The ClO2 is produced on-demand in the generation area from sodium chlorite or sodium chlorate solutions, eliminating the need for high-pressure or liquid-phase transportation and thereby avoiding explosive risks entirely.
Solution Approach 2:
The system uses in-situ generation where the decontamination equipment itself produces the ClO2 fumigant using local reagents (sodium chlorite or sodium chlorate solutions) and an acid source. This self-service approach eliminates external transportation needs and allows controlled, low-concentration production safe for building environments.
3Productivity
If humidification is added to improve ClO2 fumigant effectiveness, then decontamination efficiency increases, but corrosion of electronic equipment and metallic structures occurs
Solution Approach 1:
The system separates the humidification function from the ClO2 generation function by placing it in a dedicated neutralizing area. Humidification occurs after ClO2 has performed its decontamination function, and the humidity is combined with neutralizing agents that prevent corrosion rather than promote it.
Solution Approach 2:
Neutralizing agents serve as intermediaries that counteract the corrosive effects of humidity and by-products. These agents are introduced in the neutralizing area to chemically neutralize corrosive substances (like hydrochloric acid mist) that would otherwise damage electronic equipment and metallic structures during or after decontamination.
4Reliability
If carbon filtration is used to neutralize ClO2, then neutralization is achieved, but fire hazard increases due to ClO2 buildup in carbon pores
Solution Approach 1:
The system uses chemical neutralizing agents (such as sodium thiosulfate or other reducing agents) as intermediaries to neutralize ClO2 through chemical reaction. This chemical neutralization method avoids the physical adsorption mechanism of carbon filtration that traps ClO2 in pores, thereby eliminating the fire hazard while maintaining effective neutralization.
Solution Approach 2:
The system changes the neutralization mechanism from physical adsorption (carbon filtration) to chemical reaction (using reducing agents). This parameter change in the neutralization approach maintains effectiveness while eliminating the dangerous accumulation of ClO2 in porous media that creates fire hazards.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides efficient, one-pass neutralization, reducing costs and time for decontamination projects, ensuring sterilization is maintained even after repeated handling and changes in custody, while avoiding corrosive by-products and enhancing safety by minimizing explosive risks.
Implementation Method 1
The activation cup is permeable to air and substantially impermeable to water and reaction by-products
Implementation Method 2
ClO2 is produced in acidic solutions of sodium chlorite (NaClO2), or sodium chlorate (NaClO3)
Implementation Method 3
The end-products of ClO2 neutralization/degradation reactions are chloride (Cl—), chlorite (ClO—) and chlorate (ClO3—)
Data Source
AI summary
A scalable, portable and modular chlorine dioxide fumigant decontamination system having an activating area and a neutralizing area which may be housed separately or as a single operationally connected unit, and which may be configured as a closed loop system connected to a decontamination chamber for decontamination of articles, or as an open loop system for decontamination of interiors and large confined spaces, and employing a specialized activating cup that is permeable to air yet substantially impermeable to water and chlorine dioxide reaction by-products such that directing air through the activation cup releases nearly pure chlorine dioxide fumigant. Methods and articles relating to the system are also described.