Conductive Membrane Redox Filtration for Fouling-Resistant Water Treatment
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Solution Overview
Problem
Existing methods for removing refractory organic pollutants from water face challenges such as high energy consumption, membrane fouling, and inefficient degradation with potential secondary pollution, as well as limitations in utilizing the full potential of conductive membranes in electrochemical reactions.
Innovation Solution
A membrane-mediated electro-oxidation-reduction system is designed with anode and cathode conductive membranes connected to an external power supply, incorporating a three-dimensional carbon particles electrode to generate induced electric fields, enhancing electrochemical reactions and reducing membrane pollution through full-cell electrochemical processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If nanofiltration or reverse osmosis membranes are used to separate refractory organic pollutants, then separation efficiency is improved, but energy consumption increases due to high-pressure operation
Solution Approach 1:
The patent changes the operating parameters from high-pressure mechanical filtration to low-pressure electrochemical driving force. By applying electric potential across the conductive membrane, the system achieves pollutant removal through electro-oxidation and electro-reduction reactions rather than mechanical pressure, significantly reducing energy consumption while maintaining separation efficiency
Solution Approach 2:
The patent replaces the mechanical high-pressure filtration system with an electrochemical system. Instead of using mechanical pressure to drive water through the membrane, the system uses electrical energy to drive electrochemical reactions at the membrane surface, achieving both separation and degradation of pollutants with lower energy input
2Manufacturing precision
If membrane filtration is used to remove refractory organic pollutants, then pollutant removal is achieved, but membrane fouling occurs leading to flux reduction and increased energy consumption
Solution Approach 1:
The conductive membrane performs self-cleaning through electrochemical reactions. The applied electric potential generates reactive oxygen species and other oxidizing agents at the membrane surface that continuously degrade organic foulants, preventing their accumulation. This self-cleaning mechanism maintains stable membrane flux and extends operational life without requiring external cleaning interventions
Solution Approach 2:
The patent converts the harmful accumulation of organic pollutants on the membrane surface into a beneficial process. By applying electrochemical treatment, the accumulated organic matter is oxidized and degraded in situ, transforming the fouling problem into an opportunity for continuous pollutant destruction and membrane regeneration
3Productivity
If single oxidation or reduction methods are used to degrade pollutants, then degradation is achieved, but efficiency is low with many by-products and high risk of secondary pollution
Solution Approach 1:
The patent merges oxidation and reduction reactions into a single integrated system. The conductive membrane enables simultaneous electro-oxidation at the anode side and electro-reduction at the cathode side, allowing pollutants to be degraded through multiple pathways. This combination ensures complete mineralization of organic compounds to CO2 and H2O, preventing the formation of harmful intermediate by-products that characterize single-reduction methods
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 system achieves rapid and efficient degradation of refractory organic pollutants with reduced energy consumption, minimal by-products, and self-cleaning capabilities, addressing membrane fouling and enhancing pollutant removal efficiency.
Implementation Method 1
the fluid for treatment passes through the anode conductive membrane (4-4) for electro-oxidation filtration
Implementation Method 2
then passes through the three-dimensional carbon particles electrode (4-6) for adsorption and electrocatalysis; then, carrying out the electro-reduction filtration through the cathode conductive membrane (4-5)
Implementation Method 3
the three-dimensional particles electrode can form an induced electric field between the anode and the cathode, which not only enhances the enrichment of organic matter, but also expands the contact area of the electrochemical reaction
Implementation Method 4
The conductive membrane can make full use of the membrane pore space and 'through-flow' electrochemical reaction, thereby generating strongly redox active species in situ
Implementation Method 5
Nanofiltration or reverse osmosis membranes can separate refractory organic pollutants in water through size screening and electrostatic repulsion
Implementation Method 6
Nanofiltration or reverse osmosis membranes can separate refractory organic pollutants in water through size screening and electrostatic repulsion
Data Source
AI summary
A membrane-mediated electro-oxidation-reduction deep water treatment device and an operation method thereof, is related to the technical fields of electrochemistry, membrane separation and water treatment. The present invention provides a membrane-mediated electro-oxidation-reduction deep water treatment device of which the anode conductive membrane and the cathode conductive membrane are respectively connected to the positive and negative electrodes of an external power supply through conductive connectors. The fluid to be treated vertically penetrates through the conductive membranes (the anode conductive membrane and the cathode conductive membrane). When current passes through, the anode conductive membrane and the cathode conductive membrane produce a synergistic effect of electrochemical oxidation and reduction. At the same time, the three-dimensional carbon particles electrode becomes a bipolar particles electrode due to the induced electric field, so that the conductive membrane and the three-dimensional carbon particles electrode generate active species with strong redox in situ, expanding the reaction area, and being able to quickly degrade refractory organic pollutants in water. The present invention can obtain a membrane-mediated electro-oxidation-reduction deep water treatment device and an operation method thereof.