Adsorption Electrooxidation Tank for Selective PFC Removal
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Solution Overview
Problem
Existing technologies struggle to efficiently and selectively remove trace amounts of perfluorinated compounds from wastewater due to their high chemical stability and solubility, leading to environmental persistence and health risks, with current methods showing limited effectiveness and efficiency, especially when present in complex pollutants.
Innovation Solution
A device and method utilizing an adsorption electrooxidation tank with insoluble electrodes and granular activated carbon, performing oxidation and decomposition through adsorption and electrooxidation, maintaining a specific water level, and optionally including pretreatment for high suspended solids, to selectively and efficiently remove perfluorinated compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional treatment methods (ozone treatment, activated carbon adsorption, reverse osmosis, ion exchange, nanofiltration, membrane treatment, oxidation treatment) are used to remove perfluorinated compounds, then some removal capability is achieved, but the removal efficiency is not high and continuous operation is limited
Solution Approach 1:
The patent combines adsorption and electrooxidation processes into a single integrated system. Granular activated carbon performs adsorption while simultaneously serving as the electrode material for electrooxidation, merging two treatment mechanisms that could operate separately. This integration allows the system to address both the adsorption capacity needs and the oxidation completeness requirements in one unified process, improving both removal efficiency and continuous operation capability.
Solution Approach 2:
The patent implements continuous operation by maintaining the electrooxidation process continuously, where electrical current is applied continuously to the granular activated carbon electrode to generate oxidizing species. This continuous electrochemical action prevents the adsorbent from becoming saturated and allows for continuous degradation of perfluorinated compounds, eliminating the need for periodic shutdowns or replacements that limit continuous operation in conventional systems.
2Measurement precision
If general-purpose water treatment technology is applied to remove trace perfluorinated compounds, then some treatment is achieved, but selectivity is insufficient due to trace amounts and complex pollutants
Solution Approach 1:
The patent applies local quality by using granular activated carbon with specific surface properties and electrochemical characteristics that are locally optimized for perfluorinated compound degradation. The electrode material and its surface state are specifically tailored to enhance interaction with PFCs, creating a localized high-performance treatment zone that distinguishes itself from general-purpose treatment processes, thereby achieving both high selectivity and efficiency for trace contaminants.
Solution Approach 2:
The patent utilizes parameter changes by applying electrical current to alter the electrochemical state of the granular activated carbon, transforming it from a passive adsorbent to an active electrochemical reactor. This parameter change (application of electrical energy) enables the system to selectively degrade perfluorinated compounds through in-situ generation of oxidizing species, achieving high selectivity for trace PFCs even in the presence of complex wastewater matrices.
3Productivity
If perfluorinated compounds are partially decomposed, then some form transformation occurs, but the perfluorinated compound remains as another type and cannot be fully removed
Solution Approach 1:
The patent employs strong oxidants generated through electrooxidation at the granular activated carbon electrode. The electrical current drives the formation of highly reactive oxidizing species (such as hydroxyl radicals, superoxide radicals, and other electrochemical oxidants) that possess sufficient strength to completely degrade the chemically stable perfluorinated compounds. This accelerated oxidation process overcomes the inherent resistance of PFCs to decomposition, achieving complete mineralization rather than mere transformation, thereby eliminating the loss of substance problem.
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 method achieves stable and continuous removal of perfluorinated compounds without generating waste, ensuring high selectivity and efficiency by prolonging the breakthrough point of the adsorbent and avoiding the need for additional chemicals, thus addressing environmental and health concerns.
Implementation Method 1
oxidizing and decomposing a perfluorinated compound contained in raw water through adsorption and electrooxidation in an adsorption electrooxidation tank
Implementation Method 2
oxidizing and decomposing a perfluorinated compound contained in raw water through adsorption and electrooxidation in an adsorption electrooxidation tank
Data Source
AI summary
A device and a method for selectively removing a perfluorinated compound according to one embodiment of the present disclosure may include: oxidizing and decomposing a perfluorinated compound contained in raw water through adsorption and electrooxidation in an adsorption electrooxidation tank including a reaction unit comprising insoluble electrodes including a dimensionally stable anode (DSA) or a boron-doped diamond (BDD) electrode having a multi-electrode structure in which anodes and cathodes are arranged, and granular activated carbon filled between the insoluble electrodes; and maintaining a water level within the reaction unit at a height greater than or equal to a reaction height of the insoluble electrodes by a head adjustment device.