Forward Osmosis Membrane for Ion Exchange Elution Concentration
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Solution Overview
Problem
Ion exchange processes face challenges in reducing the volume of elution solutions, which are often high in salinity and contain hazardous substances, leading to increased disposal and transportation costs, and require energy-intensive evaporation processes for concentration.
Innovation Solution
Coupling forward osmosis with ion exchange to concentrate and recover solvent from elution solutions, reducing their volume and improving subsequent processing efficiency, while minimizing the need for chemical additions and energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If evaporation processes are used to concentrate elution solutions, then the solution concentration is improved, but energy consumption increases significantly
Solution Approach 1:
The patent uses forward osmosis, which relies on the phase transition principle of water moving from low osmotic pressure to high osmotic pressure regions through a semi-permeable membrane. This allows concentration without thermal evaporation, dramatically reducing energy consumption while achieving the desired solution concentration.
Solution Approach 2:
The patent replaces the thermal/mechanical evaporation system with a membrane-based osmotic system. Instead of using heat to evaporate water and concentrate solutions, the system uses osmotic pressure differential to drive water transfer, substituting a low-energy biological/chemical process for a high-energy thermal process.
2Loss of substance
If elution solution volume is reduced through conventional methods, then disposal costs decrease, but processing complexity increases
Solution Approach 1:
The patent extracts water from the elution solution through forward osmosis, separating it from the concentrated solutes. This extraction approach directly reduces the volume requiring disposal while simultaneously producing a valuable concentrated product stream, avoiding the need for complex multi-step processing systems.
Solution Approach 2:
The patent recovers water from the elution solution for potential reuse in regeneration processes, rather than simply discarding it. This recovery approach reduces disposal volumes and costs while creating a resource loop, simplifying overall waste management without increasing processing complexity.
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 effectively reduces elution solution volumes by 60-85%, leading to significant cost savings and enabling the recovery of solvent for reuse in ion exchange regeneration cycles, thereby decreasing disposal and transportation costs.
Implementation Method 1
coupling forward osmosis with ion exchange to concentrate and recover solvent from elution solutions
Implementation Method 2
Forward osmosis is a process that uses a membrane to separate two liquid solutions based on their osmotic pressure
Implementation Method 3
Ion exchange is a process that uses a resin with surface and interstitial functional groups contained in a contactor or vessel
Data Source
AI summary
The invention relates to a system and method of use for concentrating a solution that is eluted from an ion exchange process (elution solution) during an ion exchange regeneration using the osmotic pressure of the salt saturator. This method recovers solvent from the elution solution that could be used in a future ion exchange regeneration process. The concentration of the elution solution may include the precipitation and removal of solids from the elution solution.