Gravity Flow Filter with Segmented Carbon Block Design
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Solution Overview
Problem
Conventional gravity flow water filtration systems face challenges in achieving both high contaminant reduction and adequate flow rates, with existing filters often requiring long contact times, large volumes, and being prone to channeling issues, which affect the effectiveness and longevity of the filtration process.
Innovation Solution
A gravity-fed carbon block water filter with a solid profile design comprising multiple sub-blocks, featuring 20-90 wt% activated carbon particles and 5-50 wt% binder material, including a lead scavenger like zirconia oxide, which achieves a Filter Rate and Performance (FRAP) factor of 350 or less, ensuring effective contaminant removal and maintaining a flow rate of at least 0.1 liter per minute under 0.1-1.0 psi pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional carbon blocks designed for pressurized systems are applied to gravity flow systems, then the filtration structure is simple and easy to manufacture, but the flow rate is insufficient and does not meet desired flow rates consistently over time
Solution Approach 1:
The filter block is divided into multiple segments or chambers with different media types (activated carbon, ion exchange resin, ceramic media) arranged in series. This segmentation allows each section to perform specific filtration functions while maintaining adequate flow rates through the gravity-fed system, resolving the contradiction between simple structure and sufficient productivity.
Solution Approach 2:
The invention uses composite filtration media combining activated carbon, ion exchange resin, and ceramic materials in a single filter block. This composite approach enhances contaminant removal efficiency while maintaining flow characteristics suitable for gravity flow systems, addressing both the ease of manufacture and adequate flow rate requirements.
2Device complexity
If conventional carbon blocks are used in gravity flow systems, then the device complexity is low, but the filtration effectiveness decreases due to channeling issues and long contact times
Solution Approach 1:
Different regions of the filter block contain different filtration media optimized for specific contaminant types. The ceramic media provides mechanical filtration and biological activity, activated carbon addresses organic contaminants, and ion exchange resin targets metals. This local specialization improves filtration effectiveness without significantly increasing overall device complexity.
Solution Approach 2:
The multi-media design ensures continuous effective filtration by eliminating channeling through the use of media that work synergistically. Each media type contributes to the filtration process, maintaining consistent contaminant removal effectiveness throughout the filter's operational life, thereby improving reliability.
3Reliability
If larger filter volumes are used to improve contaminant removal, then the filtration performance increases, but the compact size requirement is not met
Solution Approach 1:
The filter utilizes porous ceramic media and activated carbon with high surface area to volume ratios. These porous materials provide extensive filtration surface area within a compact form factor, enabling effective contaminant removal in a small filter volume that meets portable device requirements.
Solution Approach 2:
The invention maximizes the use of vertical space and three-dimensional media configuration to achieve high filtration capacity in a compact volume. By optimizing the arrangement and density of filtration media in all three dimensions, the filter achieves effective contaminant removal without requiring large overall volume.
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 solution provides efficient contaminant removal, specifically reducing lead concentrations to less than 10 μg/liter after 151 liters of filtration, while maintaining a reasonable flow rate and compact size, thus enhancing the performance and longevity of gravity flow water filtration systems.
Implementation Method 1
The filter media includes about 20-90 wt % activated carbon particles
Implementation Method 2
including a lead scavenger like zirconia oxide
Implementation Method 3
A lead concentration in a final liter of effluent water filtered by the filter is less than about 10 μg/liter
Data Source
AI summary
A gravity-fed carbon block water filter in one embodiment includes a filter block comprising multiple sub-blocks each comprising filter media walls surrounding and defining a cavity for receiving fluid. Each of the sub-blocks is connected to at least one other of the sub-blocks by filter media of which the filter block is made. In one approach, the filter media includes about 20-90 wt % activated carbon, and about 5-50 wt % binder. In another approach, a lead concentration in a final liter of effluent water filtered by the filter is less than about 10 μg/liter after about 151 liters (40 gallons) of source water filtration, the source water having a pH of 8.5 and containing 135-165 ppb total lead with 30-60 ppb being colloidal lead greater than 0.1 μm in diameter. A gravity-fed water filter in other embodiments has no specified shape but achieves a FRAP factor of about 350 or less.