SiC Separator Layer Filtration for Backwash-Resistant Ceramic Filters
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Solution Overview
Problem
Existing filtration technologies, particularly those using silicon carbide membranes, face challenges with mechanical resistance during backwashing, leading to reduced effectiveness and shortened lifespan, despite improvements in abrasion resistance and selectivity.
Innovation Solution
A filtration structure incorporating a silicon carbide (SiC) membrane with specific porosity, tortuosity, and thickness, along with optional intermediate layers, is developed to enhance mechanical resistance and maintain high filtration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a silicon carbide membrane is used to improve abrasion resistance and selectivity, then filtration performance is improved, but mechanical resistance during backwashing deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the porosity (10-70%), tortuosity (<1.7), and thickness (1-30 μm) of the silicon carbide membrane to optimize both mechanical strength and filtration performance. This resolves the contradiction by finding the optimal parameter range where the membrane maintains sufficient mechanical resistance during backwashing while preserving high filtration efficiency and selectivity.
Solution Approach 2:
The patent employs composite material structure by combining silicon carbide membrane with porous support elements and optional intermediate layers. This composite approach enhances the overall mechanical resistance during backwashing while maintaining the filtration performance benefits of silicon carbide, resolving the strength-reliability contradiction through structural reinforcement.
2Strength
If the membrane thickness is increased to improve mechanical strength, then resistance to backwashing is improved, but filtrate flow rate deteriorates
Solution Approach 1:
The patent optimizes membrane thickness within a specific range of 1-30 micrometers, balancing mechanical strength and flow rate. This parameter optimization ensures the membrane is thick enough to withstand backwashing pressures while remaining thin enough to maintain high filtrate flow rates, resolving the strength-productivity contradiction.
Solution Approach 2:
The patent utilizes highly porous silicon carbide material with porosity between 10-70%, which provides both mechanical strength and high permeability. The porous structure allows the membrane to achieve adequate strength at reduced thickness compared to non-porous materials, simultaneously maintaining high filtrate flow rates while resisting backwashing forces.
3Productivity
If the porosity is increased to improve filtrate flow rate, then productivity is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent identifies an optimal porosity range of 10-70% for silicon carbide membranes that balances mechanical strength and filtrate flow rate. Within this range, the membrane achieves sufficient mechanical strength to withstand operational pressures while maintaining high porosity for excellent flow characteristics, resolving the strength-productivity contradiction.
Solution Approach 2:
The patent employs silicon carbide porous material with controlled pore structure and size distribution. The specific pore architecture provides mechanical reinforcement while maintaining high porosity, enabling the membrane to achieve both adequate strength and high filtrate flow rates simultaneously.
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 SiC membrane exhibits improved resistance to backwashing while maintaining high filtrate flow and selectivity, extending the filter's lifespan and performance.
Implementation Method 1
a porous membrane separating layer making it possible said filtration, the nature and the morphology of which are suitable for stopping the molecules or the particles
Implementation Method 2
when the filtrate spreads through the porosity of the porous support under the pressure of the fluid passing through the filter
Data Source
AI summary
A filter for the filtration of a fluid, such as a liquid, includes or is constituted by a support element made from a porous ceramic material, at least a portion of the surface of the support element being covered with a porous membrane separating layer, the membrane separating layer being constituted essentially of silicon carbide (SiC), its porosity being between 10% and 70% by volume, the median diameter of its pores being between 50 nanometers and 500 nanometers, its mean thickness being between 1 micrometer and 30 micrometers, and its tortuosity being less than 1.7.