Flash Calcined Magnesia Biocide Powder for Aquaculture Disease Control
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Solution Overview
Problem
Aquaculture faces challenges in managing diseases and biofilm growth due to the use of toxic systemic biocides, which can lead to resistance and environmental contamination. There is a need for non-toxic, broad-spectrum disease preventatives that can effectively target pathogens in aquatic, benthic, and infrastructure ecosystems without harming cultivated species or the environment.
Innovation Solution
The development of a biocide powder produced through flash calcination of carbonate compounds and magnesium hydroxide, which is then blended to achieve a high surface area and specific calcium/magnesium ratio. This powder is used to create a stable slurry that can be applied as a contact biocide, effectively suppressing biofilm growth and pathogen spread across various aquaculture ecosystems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If toxic systemic biocides are used to prevent disease and biofilm growth, then bioactivity is improved, but environmental safety and non-toxicity deteriorate
Solution Approach 1:
The patent transforms the chemical form of magnesium from bulk oxide to nano-scale particles through flash calcination, changing the physical parameter of particle size to enhance bioactivity. This parameter change allows the material to be effective at lower concentrations, reducing toxicity while maintaining or improving bioactivity against pathogens and biofilms.
Solution Approach 2:
The patent creates a composite material system combining nano-magnesia with other minerals and organic matter through flash calcination of marine sediment. This composite approach enhances the bioactivity and broadens the spectrum of effectiveness against different pathogens while maintaining environmental safety, as the complex mineral matrix reduces the likelihood of resistance development.
2Ease of manufacture
If conventional calcination methods are used, then manufacturing simplicity is maintained, but surface area and bioactivity deteriorate
Solution Approach 1:
The patent utilizes phase transitions during flash calcination, where rapid heating and cooling cycles transform the crystal structure of magnesium carbonate to nano-scale magnesia. This phase transition process inherently generates high surface area without requiring additional mechanical grinding or size-reduction steps, thus maintaining manufacturing simplicity while achieving high bioactivity.
Solution Approach 2:
The flash calcination process employs periodic action through rapid heating and cooling cycles. This periodic thermal treatment creates the necessary conditions for nano-scale particle formation, achieving high surface area materials through a relatively simple, repeatable manufacturing process that doesn't require complex equipment or multiple processing steps.
3Productivity
If high population density is maintained in aquaculture, then productivity is improved, but disease spread and pathogen transmission deteriorate
Solution Approach 1:
The patent employs a self-service approach where the nano-biocide material continuously provides disease prevention and biofilm suppression without requiring active management or reapplication. The material's high surface area enables sustained release of bioactive components, allowing intensive aquaculture systems to maintain high productivity while the material autonomously protects against disease spread in high-density conditions.
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 biocide powder effectively prevents disease and biofilm growth in aquaculture systems by maintaining healthy ecosystems, reducing the need for toxic chemicals, and promoting a stable, oxygenated environment that inhibits pathogenic microbes. It also helps in removing heavy metals and excess nutrients from the water, enhancing the overall health and sustainability of aquaculture operations.
Implementation Method 1
Flash calcination of materials is a relatively new process, first described by Sceats and Horely (WO 2007/112496) and subsequently by Sceats and Hodgson (AU 2014374829) and Sceats et al (AU 2015904534).
Implementation Method 2
Such a material would likely be a contact biocide to ensure that it is active against a wide spectrum of diseases.
Implementation Method 3
The biocide powder effectively prevents disease and biofilm growth in aquaculture systems by maintaining healthy ecosystems, reducing the need for toxic chemicals, and promoting a stable, oxygenated environment that inhibits pathogenic microbes. It also helps in removing heavy metals and excess nutrients from the water
Data Source
AI summary
A process and apparatus for manufacture of biocide products are described. The biocide properties arise from the caustic calcined powder, from carbonates such as such as magnesite and dolomite, and from hydroxides such as brucite. The method of manufacture is based on the production of high surface area oxide particles using an indirectly heated counterflow reactors for specifically calcining the carbonates and the hydroxides without significant sintering. The biocide products may be a powder or a hydrated slurry. A hydrated slurry is preferred for agriculatural applications as a spray. For aquaculture applications, the products have a preferred particle size distribution to impact the aquatic and benthic ecosystems, and a Ca/Mg ratio that promotes the growth of the cultivates species when applied as a powder or a slurry. For applications such as a marine paint, the powder product or the slurry product is mixed with various agents to form a setting coating, and is applied to the infrastructure that is otherwise subject to biofilm growth.