Diffusiophoretic Water Filtration with Gas-Permeable Membrane
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Solution Overview
Problem
Existing water filtration technologies face challenges in efficiently removing charged colloidal particles from water without complex channel structures and effective cleaning mechanisms, leading to inefficiencies and fouling issues.
Innovation Solution
A diffusiophoretic water filtration device featuring a pressurized gas chamber, an inlet manifold, and a flow chamber with a gas-permeable membrane that induces diffusiophoretic motion in colloidal particles, allowing for easy cleaning and variable outlet control, utilizing a PDMS sheet for the membrane that is gas-permeable but water-impermeable, and includes a channel structure for enhanced fluid velocity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a gas-permeable membrane is used to induce diffusiophoretic motion, then charged colloidal particles are effectively concentrated and removed, but the membrane is prone to fouling and requires complex cleaning mechanisms
Solution Approach 1:
The patent extracts the colloidal particles from the bulk water stream by inducing diffusiophoretic motion toward the membrane surface, where they are concentrated and removed through side outlets. This prevents particles from accumulating on the membrane surface, thereby reducing fouling while maintaining high filtration efficiency
Solution Approach 2:
The patent applies preliminary anti-action by using the diffusiophoretic effect to actively draw charged particles away from the membrane surface before they can deposit and cause fouling. The gas permeating through the membrane creates concentration gradients that generate electrostatic fields, which repel charged particles from the membrane surface
2Productivity
If complex channel structures are used for particle removal, then filtration effectiveness is improved, but device complexity and maintenance difficulty increase
Solution Approach 1:
The patent segments the outlet into multiple side outlets positioned at different locations along the membrane. This allows particles concentrated at different positions to be efficiently removed through the nearest outlet, improving particle removal efficiency while keeping the overall structure simpler than complex internal channel systems
Solution Approach 2:
Instead of using complex internal channels to transport particles away from the membrane, the patent inverts the approach by allowing particles to concentrate at the membrane surface and then removing them through side outlets. This simplifies the device structure while maintaining effective particle removal
3Ease of repair
If the flow chamber is designed for easy cleaning, then maintenance is simplified, but control over fluid velocity and particle concentration may be reduced
Solution Approach 1:
The patent employs dynamic control of the gas flow rate through the membrane to adjust the diffusiophoretic effect strength. By varying the gas pressure and flow rate, the system can optimize particle concentration efficiency while maintaining simple chamber geometry that allows easy cleaning access
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 device effectively concentrates colloidal particles for easy removal, reduces fouling, and allows for efficient filtration of both colloidal and non-colloidal particles, with easy maintenance and low energy consumption, achieving high water quality through controlled diffusiophoretic motion and gravitational aid.
Implementation Method 1
the gas being carbon dioxide and permeating the membrane upwardly from the gas chamber in a direction normal to the membrane so as to induce diffusiophoretic motion on at least some of the colloidal particles
Implementation Method 2
the sheet being made of a gas permeable membrane, the gas capable of permeating the membrane
Implementation Method 3
achieving high water quality through controlled diffusiophoretic motion and gravitational aid
Data Source
AI summary
A diffusiophoretic water filtration device has a pressurizable gas chamber for receiving a pressurized gas; an inlet manifold for receiving a colloidal suspension including colloidal particles in water; a flow chamber having an inlet and an outlet, the flow chamber for receiving the colloidal suspension at the inlet from the inlet manifold, the colloidal suspension flowing between the inlet and at least one outlet in a flow direction; and a gas membrane separating the gas chamber and the flow chamber, the sheet being made of a gas permeable membrane, the pressurized gas capable of permeating the membrane, the membrane being water impermeable, the gas membrane having a first side facing the pressurized gas chamber, and a second side facing the flow chamber, the flow chamber having a plurality of channels, each channel contacting the second side of the membrane; and an outlet splitter separating a first outlet from a second outlet and splitting the plurality of channels, the first outlet for receiving water having a higher concentration of some of the colloidal particles than the second outlet.