Cavitation Bubble Disinfection Device for Energy-Efficient Water Treatment
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Solution Overview
Problem
Existing methods for disinfecting water, such as heating, filtration, chemical disinfection, and plasma sterilization, face inefficiencies and challenges, particularly with high energy consumption, formation of harmful by-products, and limited penetration of UV light, making them impractical for large-scale water treatment.
Innovation Solution
A device that forms a single, stable cavitation bubble within a flow of liquid, allowing for a low-pressure gaseous discharge to be generated efficiently, creating radical species like H, O, and OH that dissolve in the liquid to degrade organic materials, including viruses and microbes, without the electrodes being wetted by the liquid, thus minimizing resistive heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating is used for disinfection, then viruses and microbes are deactivated, but energy consumption becomes prohibitively high
Solution Approach 1:
The invention utilizes cavitation bubble formation and collapse, which involves phase transition of water between liquid and vapor states. The rapid collapse of cavitation bubbles generates localized high temperature and pressure, creating a plasma state that effectively deactivates pathogens without requiring bulk heating of the water, thus resolving the contradiction between disinfection effectiveness and energy consumption
Solution Approach 2:
The system employs periodic electrical discharges through electrodes positioned within the cavitation bubble region. These periodic discharges continuously generate reactive species and maintain plasma conditions, ensuring sustained disinfection effectiveness while avoiding continuous high energy input required by traditional heating methods
2Reliability
If filtration is used to remove viruses, then water is purified, but filters clog easily requiring frequent maintenance
Solution Approach 1:
The invention replaces the mechanical filtration system with a physicochemical disinfection mechanism using cavitation and plasma. Instead of physically blocking pathogens with filters, the system uses reactive species generated by cavitation bubble collapse and electrical discharge to deactivate viruses and microbes in place, eliminating filter clogging and maintenance requirements while maintaining water purification effectiveness
3Reliability
If chemical disinfection is used, then microbes are deactivated, but harmful by-products form in the treated water
Solution Approach 1:
The invention substitutes chemical disinfection agents with a physical-chemical process involving cavitation and plasma generation. Electrical discharge through the cavitation bubble produces reactive oxygen and nitrogen species that deactivate pathogens without introducing persistent harmful by-products, resolving the contradiction between effective microbe deactivation and formation of harmful residual chemicals
Solution Approach 2:
The system changes the fundamental parameters of the disinfection process by using extreme local conditions (high temperature, pressure, and electrical field) within the cavitation bubble rather than relying on chemical reactions in bulk solution. This parameter change enables pathogen deactivation through physical and radical mechanisms that do not produce harmful by-products
4Reliability
If UV irradiation is used for disinfection, then microbes are deactivated, but penetration ability is limited and radiation is absorbed by organic matter
Solution Approach 1:
The invention replaces UV irradiation with electrical discharge through cavitation bubbles. This substitution uses direct electrical energy to generate reactive species locally within and near the bubbles, eliminating the penetration and absorption limitations of UV light while maintaining effective microbe deactivation
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
This approach enables efficient disinfection with a low electrical power requirement, achieving a 4-log reduction in active virus concentrations and effectively treating contaminated water with varying electrical conductivity, while maintaining high efficiency and minimizing energy loss to heating.
Implementation Method 1
forming a single, stable cavitation bubble due to vaporisation phenomena caused by a reduction in static pressure in the liquid after passing the narrowest portion of the nozzle
Implementation Method 2
vaporisation phenomena caused by a reduction in static pressure in the liquid
Implementation Method 3
generating a continuous gaseous discharge within this single, stable cavitation bubble
Implementation Method 4
low-pressure gaseous discharge to be generated efficiently, creating radical species like H, O, and OH
Implementation Method 5
creating radical species like H, O, and OH that dissolve in the liquid to degrade organic materials, including viruses and microbes
Data Source
AI summary
An energy-efficient disinfection or sterilisation of contaminated liquid, such as water contaminated with viruses or microbes includes an asymmetric configuration of a cavitation nozzle made from dielectric material that enables the formation of a single, stable cavitation bubble of a large volume. A low-pressure gaseous plasma is continuously formed inside the cavitation bubble by electrodes to prevent contact of the metallic electrode with liquid water and Ohmic heating of the contaminated water. The electrodes are connected to a high voltage power supply. The power supply enables formation of a continuous stable gaseous discharge inside the cavitation bubble and radicals and radiation useful for destruction of viruses to the levels below the current US EPA standard in few minutes, while the temperature of liquid water remains practically unchanged. Use is not only for hospitals and pharmaceutical companies but the food industry and agriculture as well.