Selective Ion Separation Membranes for Wastewater Resource Recovery
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Solution Overview
Problem
Existing wastewater treatment methods lack the selectivity to efficiently target specific pollutants while preserving valuable resources, often requiring significant energy inputs and generating secondary waste streams, failing to address the need for sustainable water management solutions.
Innovation Solution
A selective ion separation system (SISR) using a pair of electrodes and multi-compartment cells with specific ion exchange membranes, applying a voltage to transport and separate select ions, producing concentrated output streams of desirable constituents while removing undesirable ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional wastewater treatment methods are used, then pollutant removal is achieved, but selectivity for specific pollutants is poor and valuable resources are lost
Solution Approach 1:
The system segments the separation process into multiple compartments with different membrane types (cation exchange, anion exchange, bipolar membranes) arranged in specific sequences. Each membrane layer selectively targets specific ion types, enabling graduated separation of different pollutants and resources from the wastewater stream.
Solution Approach 2:
Different regions of the system employ different membrane properties - cation exchange membranes in some compartments, anion exchange membranes in others, and bipolar membranes at interfaces. This local differentiation of membrane quality enables selective transport of specific ions (monovalent vs. multivalent, cations vs. anions) to achieve high selectivity for target substances.
2Reliability
If conventional treatment methods are used, then treatment effectiveness is achieved, but energy consumption is high
Solution Approach 1:
The system replaces high-energy mechanical treatment processes (aeration, mixing, chemical dosing) with electrochemical driving forces. Electric current applied across the membrane stack provides the energy needed for ion transport, eliminating the need for extensive mechanical aeration and chemical addition required by conventional methods.
Solution Approach 2:
The system changes the energy input parameter from chemical reagents and mechanical energy to electrical energy. By controlling voltage and current density applied across the selective membranes, the system achieves effective pollutant removal and resource recovery with lower overall energy consumption compared to conventional thermal or chemical treatment processes.
3Loss of substance
If conventional treatment methods are used, then pollutant removal is achieved, but secondary waste streams are generated
Solution Approach 1:
The system converts the harmful pollutant-laden wastewater into valuable resources. By passing current through the selective membranes, valuable ions (metal cations, nutrient anions) are concentrated in specific compartments and can be recovered as products, while pollutants are selectively removed. This transforms waste streams into recoverable resources.
Solution Approach 2:
The system simultaneously discards harmful pollutants in specific compartments while recovering valuable constituents in other compartments. The multi-compartment design allows separate collection of different ion types, enabling recovery of metals, nutrients, and other valuable substances from the wastewater stream.
4Productivity
If conventional treatment methods are used, then general treatment is achieved, but selectivity for specific ions is poor
Solution Approach 1:
The system segments the separation process into multiple compartments with different membrane types (cation exchange, anion exchange, bipolar membranes) arranged in specific sequences. Each membrane layer selectively targets specific ion types, enabling graduated separation of different pollutants and resources from the wastewater stream.
Solution Approach 2:
Different regions of the system employ different membrane properties - cation exchange membranes in some compartments, anion exchange membranes in others, and bipolar membranes at interfaces. This local differentiation of membrane quality enables selective transport of specific ions (monovalent vs. multivalent, cations vs. anions) to achieve high selectivity for target substances.
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 SISR system achieves superior selectivity and efficiency in separating specific ions from wastewater, enabling simultaneous water treatment and resource recovery, contributing to sustainable water management and a circular economy.
Implementation Method 1
a first membrane (selective cation exchange membrane that is selective to all monovalent cations or specific cations), the first membrane being impermeable to a first aqueous ion and selectively permeable to a second aqueous ion
Implementation Method 2
applying a voltage across said cathode and anode to transport select ions through compatible ion exchange membranes
Data Source
AI summary
The present disclosure describes an electrochemical system and methods for the selective separation and simultaneous recovery of ionic constituents in a feed-, raw-, or wastewater. The system entails novel electrochemical configurations comprising various ion exchange membranes in concert with a voltage applied across a pair of electrodes. In some embodiments, the novel electrochemical system may include one or more of a pair of electrodes, a first membrane selectively permeable to a first wastewater constituent, a second membrane selectively permeable to a second wastewater constituent, a third membrane selectively permeable to a third wastewater constituent, a fourth membrane impermeable to ions that allows for the separation of a fourth constituent by preventing mixing between first and third product channels when a plurality of membrane stacks are utilized, and at least four spacing frames comprising a structural element, a gasket, and a flow channel.