Gravity-Fed Water Filter with Composite Antimicrobial Media
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Solution Overview
Problem
Existing gravity-fed filtration systems face challenges with insufficient filtration lag time and contamination risks, particularly in field conditions, where dirty water can contaminate clean water, and there is a need for improved antimicrobial solutions to ensure water purity.
Innovation Solution
A gravity-fed water filtration system featuring a funnel-shaped filtration component with a horizontal layer of antimicrobial material comprising titanium oxide and silver salt, which includes a composite disinfectant media with a support substrate, micrometric aggregates of titanium oxide, and silver aggregates, providing a germicidal surface for effective microorganism reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filtration systems are used, then water filtration is provided, but filtration lag time is insufficient and contamination risks remain
Solution Approach 1:
The patent employs composite filtration media combining multiple materials with distinct functions: activated carbon for adsorption of organic contaminants, titanium oxide for photocatalytic disinfection, and silver compounds for antimicrobial activity. This composite structure enables simultaneous filtration and disinfection processes, reducing the overall filtration lag time while ensuring water purity through multiple mechanism synergies.
Solution Approach 2:
The patent utilizes titanium oxide as a photocatalyst that generates strong oxidative radicals when exposed to light. These radicals rapidly decompose organic contaminants and inactivate microorganisms, significantly accelerating the disinfection process and reducing the time required to achieve potable water quality compared to conventional filtration alone.
2Reliability
If simple filtration structures are used, then device complexity is reduced, but antimicrobial effectiveness is insufficient
Solution Approach 1:
The patent applies different functional materials to specific zones within the filtration structure: activated carbon in the bulk filtration layer for mechanical filtering and adsorption, titanium oxide coating on the filter surface for photocatalytic action, and silver compounds distributed throughout the media for sustained antimicrobial activity. This localized functional differentiation enhances overall antimicrobial effectiveness without requiring a completely complex multi-stage system.
Solution Approach 2:
The filtration media is designed to perform multiple functions simultaneously: physical filtration, adsorption of contaminants, photocatalytic disinfection, and antimicrobial action. The silver compounds provide sustained antimicrobial protection without requiring additional power or complex control systems, while the titanium oxide activates under ambient light conditions, enabling the system to serve itself with minimal external input.
3Ease of repair
If non-replaceable filtration media is used, then device complexity is reduced, but maintenance flexibility is limited
Solution Approach 1:
The filtration system is divided into modular components: a reusable filter housing and replaceable filtration cartridges containing the composite media. This segmentation allows users to replace only the consumable filtration cartridges when depleted or contaminated, while retaining the expensive housing and structural components, thereby enhancing maintenance flexibility without significantly increasing overall device complexity.
Solution Approach 2:
The patent employs disposable or replaceable filtration cartridges that can be discarded after use or regenerated through cleaning processes. The reusable housing and internal structures are recovered and retained for continued use, optimizing resource utilization and simplifying maintenance operations by separating permanent from consumable components.
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 effectively filters and purifies water by reducing microorganisms without chemical residues, ensuring potable water quality and providing a replaceable pre-filter component that can be replaced independently of the disinfectant media, enhancing water safety and convenience.
Implementation Method 1
a horizontal layer of antimicrobial material comprising titanium oxide and a silver salt
Implementation Method 2
composite disinfectant media with a support substrate, micrometric aggregates of titanium oxide, and silver aggregates, providing a germicidal surface for effective microorganism reduction
Implementation Method 3
gravity-fed filtration systems
Implementation Method 4
activated charcoal filter
Data Source
AI summary
A gravity-fed filtration apparatus includes a filter housing having a water inlet near an upper portion of the filter housing and a water outlet near a lower portion of the filter housing. A water filter having a plurality of discs is removably stacked within an interior cavity of the filter housing between the water inlet and the water outlet. An outer perimeter portion of each of the plurality of discs sealingly engages with an inner surface of the filter housing. A first disc of the plurality of discs comprises a first plurality of diffusers and a disinfectant media. A second disc of the plurality of discs comprises a mesh. The lower portion of the filter housing is configured to be disposed in the mouth of a water vessel.