Bipolar Electrode Assembly With Selective Anode Coating for Wastewater Cells
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Solution Overview
Problem
Existing electrolytic cells with bipolar electrodes for wastewater treatment face challenges in catalyst utilization, manufacturing complexity, and high costs due to the need for full catalyst coating on both anode and cathode surfaces, leading to premature failure and increased expenses, especially with expensive catalysts like diamond.
Innovation Solution
The design features a stacked arrangement of anode, cathode, and bipolar electrode assemblies with interleaved orientations, using conductive spacers to maintain optimal distances and catalyst coating only on anode surfaces, connected via threaded bolts and non-conductive spacers to prevent delamination and simplify assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If catalyst is coated on the entire surface of bipolar electrodes (both anode and cathode portions), then the electrode structure is simple and easy to manufacture, but catalyst utilization is poor and costs increase significantly
Solution Approach 1:
The patent applies local quality by coating catalyst only on the anode portions of bipolar electrodes rather than the entire surface. The cathode portions are left uncoated, creating different surface properties in different regions of the same electrode structure. This selective coating reduces catalyst consumption while maintaining effective electrochemical oxidation at the anode surfaces where it is needed.
2Quantity of substance
If catalyst is coated only on anode portions of bipolar electrodes, then catalyst utilization improves and costs reduce, but the electrode assembly complexity increases
Solution Approach 1:
The patent segments the bipolar electrode into distinct anode and cathode portions with different functional requirements. By dividing the electrode surface into coated (anode) and uncoated (cathode) regions, the system achieves better catalyst utilization. The segmentation is implemented through controlled coating processes that apply catalyst only to specific portions, reducing overall catalyst quantity while managing the complexity through systematic design.
3Device complexity
If bipolar electrodes are used with full catalyst coating, then electrical connection is simplified, but operational reliability decreases due to catalyst delamination
Solution Approach 1:
The patent improves reliability by applying catalyst only where electrochemical oxidation is required (anode portions). This localized approach prevents catalyst delamination issues on cathode portions where coating would be unnecessary and potentially problematic. The selective coating strategy ensures that catalyst layers are only applied to surfaces where they will remain stable and functional, thereby improving overall system reliability.
4Ease of manufacture
If monopolar cells are used instead of bipolar cells, then catalyst coating is simpler, but power supply cost and conductor size increase
Solution Approach 1:
The patent employs bipolar electrodes that serve dual functions as both anodes and cathodes within the same structure. Each bipolar electrode has portions that function as anodes (coated with catalyst) and portions that function as cathodes (uncoated). This multi-functionality allows the system to achieve efficient electrochemical oxidation while reducing power supply costs and conductor sizes compared to monopolar configurations, as the bipolar design enables current to flow through multiple electrodes in series.
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 configuration enhances catalyst efficiency, reduces manufacturing complexity, and lowers costs by optimizing electrode utilization and current distribution, while maintaining effective wastewater treatment performance.
Implementation Method 1
direct electrochemical oxidation of organic and/or inorganic pollutants whereby such pollutants are oxidized directly on the anode surface
Implementation Method 2
indirect electrochemical oxidation of organic and/or inorganic pollutants through the in-situ generation of chemically oxidizing species (such as hydroxyl, chlorine, oxygen or perchlorate radicals)
Implementation Method 3
Bipolar cells are run at higher voltage and lower current than the monopolar cells (having the same reactive area and operating at the same current density)
Implementation Method 4
electrolytic cell for treating wastewater which comprises a plurality of bipolar electrode assemblies
Data Source
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AI summary
An electrolytic cell for treating wastewater comprises an anode assembly, a cathode assembly and at least one bipolar electrode assembly placed between the anode and the cathode assembly such that the anodes of the anode assembly and the cathodes of the cathode assembly are interleaved with the bipolar plates of the bipolar electrode assembly. Each bipolar electrode assembly comprises a series of bipolar electrodes which operate as an anode or as a cathode, stacked in a vertical direction along a threaded bolt made of an electrically conductive material such that the bipolar electrodes operating as anodes are oriented in an opposite direction to the bipolar electrodes operating as cathodes and have their ends overlapping over a predetermined portion and being separated by conductive spacers. In preferred embodiments, only the anodes and the bipolar electrodes operating as anodes are coated with catalyst which saves costs and simplifies the manufacturing process.