Compact Ceramic Filter Using Diatomaceous Earth and Metallic Compounds
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Solution Overview
Problem
Conventional ceramic filters are bulky, non-portable, and ineffective in removing pathogens such as protozoa, bacteria, and viruses from drinking water, leading to unpalatable and potentially harmful water sources, which often necessitate expensive bottled water solutions.
Innovation Solution
A ceramic filter composition comprising 75-87% diatomaceous earth, 10-20% flux, and 0.03-0.4% metallic compounds like copper, with a preferred compression ratio and thickness, capable of removing particles larger than 1.5µm, including protozoa like Cryptosporidium and Giardia, through a manufacturing process involving specific diatomaceous earth and flux combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional ceramic filters are used, then filtration is provided, but they are bulky and non-portable
Solution Approach 1:
The patent changes the physical and chemical parameters of the ceramic filter by using specific ratios of diatomaceous earth (75-87%), flux (10-20%), and metallic compounds (0.03-0.4%). The compression ratio is optimized to 0.30-0.55, and thickness is reduced to 2.0-4.5mm, making the filter compact and portable while maintaining effectiveness
Solution Approach 2:
The patent creates a composite ceramic material combining diatomaceous earth with specific fluxes and metallic compounds. This composite structure achieves both compact size and high filtration efficiency, resolving the contradiction between portability and filtration performance
2Reliability
If conventional ceramic filters are used, then filtration is provided, but they cannot remove pathogens such as protozoa
Solution Approach 1:
The patent utilizes the natural porous structure of diatomaceous earth, which has pore sizes that can trap protozoa and other pathogens. The controlled porosity combined with the compression ratio creates an effective physical barrier against pathogens while maintaining a relatively simple filter structure
Solution Approach 2:
The patent incorporates metallic compounds (0.03-0.4%), particularly copper and zinc, which provide antibacterial and antimicrobial properties. These metals act as strong oxidants that kill or inhibit pathogens, enhancing pathogen removal efficiency without significantly increasing structural complexity
3Manufacturing precision
If ceramic filters with higher compression ratio are used, then filtration efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the compression ratio to a specific range (0.30-0.55) that balances filtration precision with manufacturing feasibility. This parameter optimization ensures high filtration efficiency while keeping the manufacturing process relatively simple and avoiding excessive complexity
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 ceramic filter effectively removes up to 100% of Giardia and 98% of Cryptosporidium from tap water, providing both excellent filtration and antibacterial properties, making it suitable for various applications including purifying mains tap water.
Implementation Method 1
The ceramic filter is conveniently capable of removing material having a size of 1.5μm or greater in diameter
Implementation Method 2
the term 'flux' is intended to mean a vitrifying agent which reduces the melting temperatures of the ingredients and induces ceramic bonding
Implementation Method 3
The metallic compound is preferably present in the filter in an amount of from about 0.05% to about 0.3%, preferably from 0.1% to about 0.25%, more preferably from about 0.13% to about 0.23%, most preferably about 0.18% by weight of the ceramic filter
Data Source
AI summary
A ceramic filter comprising: (a) from about 75% to about 95% by weight of diatomaceous earth; (b) from about 10% to about 20% by weight of a flux; and (c) from about 0.03% to about 0.4% by weight of a metallic compound; the percentages by weight being percentages by weight of the ceramic filter.