Single-Layer Filter Media Gradient Structure for Water Filtration
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Solution Overview
Problem
Dual- and multi-layer water filters experience significant decreases in flow rate due to air entrapment and bio-slime growth, leading to inefficient filtration of lead and other metal particulates, well before their expected lifetime performance.
Innovation Solution
A single-layer filter media with a gradient of distinct density layers, utilizing fibrillated nanofibers and active powders, which captures colloidal particles and allows them to become soluble, preventing air entrapment and bio-slime growth, while maintaining efficient flow rates and extended filter life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual-layer or multi-layer filter media are used to capture colloidal particles, then filtration effectiveness is improved, but flow rate decreases significantly before expected lifetime
Solution Approach 1:
The patent combines multiple filter media layers into a single integrated layer where the first filter media (for soluble materials) and second filter media (for colloidal particles) are merged. This eliminates the interface between layers where air entrapment occurs, maintaining filtration effectiveness while preventing flow rate degradation.
Solution Approach 2:
The patent extracts and removes the harmful air pockets that get trapped between separate filter media layers. By using a single integrated layer, the design eliminates the spaces where air entrapment occurs, thereby maintaining consistent flow rates throughout the filter's operational life.
2Reliability
If multiple filter media layers are used to create physical barriers, then contaminant capture is improved, but air entrapment occurs reducing flow rate
Solution Approach 1:
The patent merges the first and second filter media into a single integrated layer with distinct functional zones. The first zone captures soluble materials while the second zone captures colloidal particles, eliminating the interface between layers and preventing air entrapment that would otherwise reduce flow rate.
3Reliability
If dual-layer filter media are used, then filtration performance is improved, but bio-slime growth occurs at interfaces
Solution Approach 1:
The patent combines multiple filter media into a single integrated layer, eliminating the interfaces between layers where bio-slime growth typically occurs. This single-layer design maintains filtration performance while removing the conditions that promote harmful biological growth.
4Productivity
If single-layer filter media is used, then flow rate is maintained, but filtration effectiveness may be reduced
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the single filter media layer. The first zone is optimized for capturing soluble materials while the second zone is optimized for capturing colloidal particles, allowing the single layer to provide the filtration effectiveness of multiple layers while maintaining flow rate.
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 single-layer filter media achieves efficient removal of soluble and insoluble particulates, including lead, with improved flow performance and extended filter life, comparable to or exceeding dual-layer designs, while eliminating issues of air entrapment and bio-slime growth.
Implementation Method 1
the at least two distinct density layers form a physical barrier for the colloidal material for capturing the colloidal particles
Implementation Method 2
utilizing fibrillated nanofibers and active powders, which captures colloidal particles and allows them to become soluble
Implementation Method 3
a water filter for gravity filtration applications
Data Source
AI summary
A single sheet water filter media for gravity filtration applications that improves flow performance over the product life while maintaining sufficient metal reduction, wherein at least two distinct density gradients of the single sheet form a physical barrier for capturing colloidal and insoluble contaminants, retaining the colloidal and insoluble contaminants until the contaminants become soluble in the fluid, and being removed by the single sheet filter media. The single sheet filter overcomes the difficulties of dual- and multi-layer filters attributable to slower flow rate realized well before the rated lifetime of the product. The two distinct density gradients of the single sheet filter media are created by exerting a force on a liquid slurry, such force resulting in the separation of higher powder loading and fibers that compose the top and bottom density gradients, respectfully.