3D Printed Membrane Spacer for Filtration Anti-Fouling
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Solution Overview
Problem
Current membrane filtration technologies face challenges with membrane fouling, particularly in wastewater treatment, due to limitations in printing resolution and design flexibility, which hinder the effective separation of small oil droplets and pollutants, and require complex spacer designs that are difficult to manufacture using conventional techniques.
Innovation Solution
A method involving direct 3D printing of complex structures onto porous membranes using a printing-on-membrane approach, allowing for the creation of 3D-structured hybrid membranes with integrated functional parts, such as metallic micromesh and polymeric membranes, without the need for assembly, using photo-polymerization and micro-stereolithography to achieve high permeate flux and anti-fouling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional 3D printing is used to create complex spacer designs, then design flexibility and manufacturing ease are improved, but printing resolution is insufficient to accurately print membrane pore sizes
Solution Approach 1:
The patent merges the membrane and spacer into a single integrated structure fabricated by 3D printing. The membrane is printed as the base layer, and the spacer is printed directly on top of it in the same manufacturing process, eliminating the need for separate assembly and enabling complex geometries that were previously impossible to manufacture
Solution Approach 2:
The patent transitions from 2D membrane-spacer assemblies to 3D printed structures with complex spatial geometries. The spacer features three-dimensional lattices, arches, and curved surfaces that provide enhanced flow distribution and anti-fouling properties while maintaining structural integrity
2Ease of manufacture
If conventional membrane module assembly is used, then manufacturing simplicity is maintained, but design flexibility for complex geometries is limited
Solution Approach 1:
The patent combines multiple manufacturing steps into a single 3D printing process. The membrane support layer, active membrane layer, and spacer structure are all fabricated simultaneously in one continuous print job, eliminating the need for separate assembly operations while enabling complex geometries
Solution Approach 2:
The patent utilizes variable printing parameters including infill density, layer height, and extrusion rate to create regions with different mechanical properties and pore sizes within the same structure, enabling optimization of both structural support and filtration performance
3Adaptability or versatility
If integrated 3D printing is used to fabricate membrane and spacer, then design flexibility and anti-fouling performance are improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the membrane module into functionally distinct zones printed with different parameters: a support layer with higher infill density for structural integrity, an active membrane layer with optimized pore structure for filtration, and a spacer with open lattice geometry for flow distribution. Each zone is printed with material properties tailored to its specific function
4Ease of manufacture
If conventional spacer designs are used, then manufacturing ease is maintained, but hydrodynamic flow and anti-fouling performance are limited
Solution Approach 1:
The patent employs curved and rounded spacer geometries including arches, domes, and cylindrical supports instead of sharp corners and flat surfaces. These curved features promote smoother fluid flow, reduce turbulence and dead zones, and minimize particle accumulation, thereby enhancing hydrodynamic performance and anti-fouling properties
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 approach enables the fabrication of all-in-one filtration devices with enhanced anti-fouling and anti-clogging properties, improved hydrodynamic flow, and increased design flexibility, effectively addressing membrane fouling and separation challenges in wastewater treatment, while reducing manufacturing complexities and fluid leaks.
Implementation Method 1
causing the ink to solidify can involve curing the ink using light
Implementation Method 2
In the filtration process, purified water passes through the membrane, whereas the oil droplets, plastic micro-particles, and solutes are rejected by the membrane
Implementation Method 3
purified water passes through the membrane
Data Source
AI summary
Three-dimensional printing on a membrane of a filtration device is described herein. Forming the filtration device involves receiving a membrane comprising a porous material, depositing an ink into pores of the porous material, causing the ink to solidify, and continuously building three-dimensional printed structures via micro-stereolithographic three-dimensional printing. Solidifying the ink causes the ink to bond with the membrane.