Filter Medium Nanofiber Web Backwashing Durability
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Solution Overview
Problem
Current water treatment filters face challenges in maintaining mechanical strength and flow rate during backwashing, leading to potential damage and reduced durability, especially when dealing with high-pressure conditions and the accumulation of foreign substances that degrade filtration performance.
Innovation Solution
A filter medium is designed with a nanofiber web and multiple support layers, where the nanofiber web has a basis weight of 30 g/m2 or less and the first support has a basis weight of 250 g/m2 or more, with a thickness of 90% or more of the overall medium, and includes a low melting point component for fusion bonding to enhance mechanical strength and adhesion, while maintaining a high flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressure is applied to clean the filter medium during backwashing, then foreign substances are removed and filtration performance is maintained, but the filter medium may be damaged and delamination may occur
Solution Approach 1:
The filter medium uses a composite structure combining nanofiber web (30 g/m2 or less) with multiple support layers (first support with 250 g/m2 or more and second support). This composite construction provides both the fine filtration capability of the nanofiber web and the mechanical strength to withstand high-pressure backwashing without damage or delamination.
Solution Approach 2:
Different layers of the filter medium have different basis weights optimized for their specific functions: the nanofiber web has low basis weight (30 g/m2 or less) for fine filtration, while the first support has high basis weight (250 g/m2 or more) for mechanical strength. This local differentiation allows each layer to perform its optimal function.
2Reliability
If high pressure is applied during backwashing, then foreign substances are removed, but flow rate is reduced due to compression of the filter medium
Solution Approach 1:
The nanofiber web acts as a flexible thin film that can compress under backwashing pressure to release foreign substances while maintaining its porous structure. The flexible support layers prevent permanent deformation, allowing the medium to recover its flow characteristics after backwashing.
Solution Approach 2:
The filter medium is segmented into multiple functional layers: the nanofiber web for filtration, the first support for mechanical strength, and the second support for additional structural integrity. This segmentation allows the compression during backwashing to be localized to the filtration layer while the support layers maintain overall structural integrity and flow paths.
3Productivity
If the nanofiber web has low basis weight (30 g/m2 or less), then water permeability and flow rate are improved, but mechanical strength and durability during backwashing are reduced
Solution Approach 1:
The low basis weight nanofiber web (30 g/m2 or less) is combined with multiple support layers having high basis weight (first support: 250 g/m2 or more, second support: appropriate weight). This composite structure transfers the mechanical load from the fragile nanofiber web to the strong support layers, allowing the web to maintain its low basis weight for high water permeability while the supports provide the necessary mechanical strength for backwashing durability.
Solution Approach 2:
The support layers act as intermediaries that protect the nanofiber web from direct mechanical stress during backwashing. The first support (with 250 g/m2 or more basis weight) and second support serve as mediators between the high-pressure backwashing force and the delicate nanofiber web, absorbing and distributing the mechanical stress to prevent damage to the filtration layer.
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
This configuration minimizes deformation and damage during backwashing, ensures high flow rates, and extends the filter medium's lifespan by providing excellent durability and resistance to high-pressure conditions, making it suitable for various water treatment applications.
Implementation Method 1
the first support and the second support are fused with each other and with the nanofiber web, respectively, through a low melting point component
Data Source
AI summary
A filter medium is provided. The filter medium according to an embodiment of the present invention comprises a second support body and a nanofiber web layer which are sequentially stacked on each of both surfaces of a first support body, and is a filter medium having a flow path through which a filtrate filtrated in the nanofiber web flows in the direction of the first support body, wherein the nanofiber web has a basis weight of 30 g/m2 or less, the first support body has a basis weight of 250 g/m2 or more, and a thickness of 90% or more of the total thickness of the filter media. Accordingly, even in a backwash process performed at high pressure, as the shape, structural deformation, and damage of the filter medium can be minimized, the use period can be extended. In addition, as the flow path is smoothly secured at high pressure applied at the time of filtration and/or backwashing, the filtration water is quickly discharged to the outside from the inside of the filter medium or the backwashing efficiency is very excellent, and accordingly it is possible to be applied in various ways in various water treatment fields.