Vortex Diode Cavitation for Ballast Water Disinfection
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Solution Overview
Problem
Current methods for treating ship's ballast water are inadequate in effectively disinfecting without using chemicals, UV, or ultrasound, and often result in environmental pollution due to the introduction of invasive species, with existing technologies failing to achieve desired microbial kill rates and efficiency.
Innovation Solution
The use of a vortex diode with tangential inlet and axial outlet ports, incorporating hydrodynamic cavitation and filtration through bleed holes, which generates cavitation for disinfection and segregates suspended solids, allowing for efficient treatment of ballast water without chemicals or chemical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical disinfection methods are used, then microbial kill rate is improved, but environmental pollution and harmful byproducts increase
Solution Approach 1:
The invention converts the harmful effect of high-pressure water jets into beneficial cavitation bubbles that disinfect water. The high-pressure jets create vacuum zones that draw in air and form cavitation bubbles, which then collapse to generate micro-jets that kill microorganisms without chemicals.
Solution Approach 2:
The invention replaces chemical disinfection systems with a mechanical cavitation system. Instead of using chemicals to kill microorganisms, the system uses mechanically generated cavitation bubbles that collapse to create physical micro-jets and shock waves, achieving disinfection through mechanical means.
2Reliability
If UV treatment is used, then disinfection effectiveness is improved, but system complexity and cost increase
Solution Approach 1:
The invention replaces UV radiation systems with a mechanical cavitation system. Instead of using ultraviolet light to disinfect, the system uses mechanically generated cavitation bubbles that collapse to create physical micro-jets and shock waves, achieving disinfection through purely mechanical means.
Solution Approach 2:
The cavitation system is self-sustaining once initiated. The high-pressure water jets automatically create the cavitation bubbles needed for disinfection without requiring external energy inputs like UV lamps, making the system simpler and more self-regulating.
3Reliability
If ultrasound treatment is used, then microbial destruction is improved, but energy consumption and equipment complexity increase
Solution Approach 1:
The invention replaces ultrasonic vibration systems with a mechanical cavitation system driven by high-pressure water jets. Instead of using ultrasonic waves to destroy microorganisms, the system uses focused high-pressure jets that create cavitation bubbles, achieving microbial destruction through a different mechanical mechanism.
Solution Approach 2:
The invention uses hydraulic principles by employing high-pressure water jets to create cavitation. The system uses the water itself as the medium to generate the cavitation bubbles through pressure variation, eliminating the need for separate ultrasonic transducers and reducing energy consumption.
4Quantity of substance
If filtration alone is used, then removal of suspended solids is improved, but microbial disinfection is insufficient
Solution Approach 1:
The invention merges filtration and cavitation disinfection into a single integrated system. The high-pressure water jets that create cavitation also serve as the filtration medium, and the cavitation bubbles provide both disinfection and enhanced filtration through their collapse, achieving both suspended solid removal and microbial destruction simultaneously.
Solution Approach 2:
The high-pressure water jet system performs multiple functions: it creates cavitation bubbles for disinfection, provides mechanical filtration through the jet flow, and generates the pressure differential needed for water circulation. This multi-functionality eliminates the need for separate filtration and disinfection systems.
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 achieves significant microbial reduction and filtration in a single process, reducing environmental impact by effectively disinfecting ballast water and filtering out organisms, meeting IMO guidelines while being cost-effective and eco-friendly.
Implementation Method 1
Cavitation is a phenomenon of formation, growth and collapse of micro bubbles within a liquid. In hydrodynamic cavitation, the pressure variation in the flowing liquid causes cavitation. If the pressure falls below a critical value, usually below the vapor pressure of the medium at operating temperature, then small bubbles or vapor cavities are formed in the fluid.
Implementation Method 2
The apparatus and method of the present invention for sea water treatment have particular utility in a ship to treat ship's ballast water that is being transported from one region to another.
Data Source
AI summary
The invention disclosed provides an apparatus and method for filtration and disinfection of ship's ballast water, such as sea water, based on hydrodynamic cavitation. The apparatus comprises a vortex diode with a tangential entry port and an axial outlet port with single or multiple bleeding holes. The disinfected water may be re-circulated through the system for additional disinfection or released from the tank into the surrounding waterways. The disinfection of seawater/ship's ballast water is achieved through filtration and hydrodynamic cavitation and the method does not involve use of any chemicals or any chemical reaction. The invented apparatus and method is simple, eco-friendly and can be fitted on to existing intake and discharge systems of any ship with minor modifications. It poses no risk to the health of the ship's crew unlike chemical methods and requires no special skill or additional manpower for its operation. The apparatus and method is capable of effectively sterilizing hazardous organisms contained in ballast water stored in a ballast tank.