Cassette-Style Rotating Anode Assembly for Scaled Electrode Renewal
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Solution Overview
Problem
Existing electrocoagulation reactors face issues with electrode scaling and diminished effectiveness due to metal coating processes, necessitating the use of readily removable and resurfaceable structures, and chemical coagulation generates significant sludge volumes.
Innovation Solution
A rotating electrode assembly with a housing, including a motor-driven shaft and planar electrodes, facilitates continuous fluid recirculation and exposure to an electric field for effective electrocoagulation, with removable cassette-style electrodes for easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical coagulation is used to remove contaminants, then contaminant removal is achieved, but large volumes of sludge with significant bound water content are generated
Solution Approach 1:
The patent replaces chemical coagulation methods with electrocoagulation, using electrical energy to generate reactive ions and metallic hydroxides in situ. This substitution eliminates the need for chemical coagulants like alum or ferric chloride, thereby avoiding the generation of large volumes of sludge while maintaining effective contaminant removal through electrochemical reactions.
Solution Approach 2:
The patent changes the fundamental mechanism from chemical addition to electrical energy application. By applying an electric field across electrodes, the system generates reactive species through electrochemical reactions rather than relying on chemical coagulants. This parameter change from chemical concentration to electrical field strength enables contaminant removal without producing bound water-containing sludge.
2Reliability
If electrodes are used in electrocoagulation reactors, then electrocoagulation effectiveness is improved, but electrode scaling and metal coating processes diminish effectiveness over time
Solution Approach 1:
The patent employs a rotating electrode assembly that continuously moves through the fluid. This dynamic configuration prevents scaling and metal coating accumulation on electrode surfaces by constantly exposing fresh surfaces to the contaminant-laden fluid. The rotation mechanism ensures that no single area of the electrode remains stationary long enough for significant scaling to occur, thereby maintaining electrocoagulation effectiveness over extended operation periods.
Solution Approach 2:
The rotating electrode design allows for continuous renewal of active electrode surfaces. As electrodes rotate, scaled or coated portions are effectively discarded from the active zone, while fresh metal surfaces are continuously presented to the fluid for electrocoagulation. This continuous discarding of scaled surfaces restores electrode effectiveness without requiring complete replacement.
3Stability of the object's composition
If fixed electrode structures are used in electrocoagulation reactors, then structural stability is maintained, but readiness for removal and resurfacing is reduced
Solution Approach 1:
The electrode assembly is segmented into modular components that can be independently removed and replaced. The rotating electrode assembly is designed as a separate, removable unit from the reactor housing, allowing easy extraction for resurfacing or replacement. This segmentation maintains structural stability during operation while enabling convenient maintenance activities.
Solution Approach 2:
The electrode structure transitions from a fixed, static configuration to a dynamic, rotatable assembly that can be easily removed. The rotating electrode design incorporates coupling mechanisms that allow the assembly to be detached from the drive shaft and removed from the reactor. This dynamic design maintains operational stability during use while providing easy access for maintenance, resurfacing, or replacement.
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 apparatus achieves efficient contaminant removal with reduced sludge generation and maintains electrode effectiveness by allowing easy replacement of corroded components, enhancing the electrocoagulation process.
Implementation Method 1
In electrocoagulation, reactive ions may be generated in situ by oxidation of an effective anode material or reactive metallic hydroxides may be generated within the effluent. Such process offers an alternative to the addition of salts, polymers, or polyelectrolytes. Metals, colloidal solids, and suspended particles and oil droplets may be removed from wastewater by agglomeration or coagulation and resultant separation from the aqueous phase.
Implementation Method 2
reactive ions may be generated in situ by oxidation of an effective anode material
Implementation Method 3
the motor rotates the inner shaft such that, when fluid is contained within the housing and the motor rotates the inner shaft, the fluid is caused to pass through a first volume between the inner shaft and the first planar stationary electrode and to flow radially outward between the first planar stationary electrode and the first rotatable electrode
Data Source
AI summary
An apparatus for removing contaminants from fluid is disclosed. The apparatus includes a rotating electrode assembly including an inner shaft rotatably mounted within the housing and a first rotatable planar electrode extending radially outward from the inner shaft. The apparatus also includes a first planar stationary electrode having a first opening, the first opening shaped to permit the inner shaft to pass through the first opening, the first planar stationary electrode extending parallel to the first rotatable planar electrode, wherein the first planar stationary electrode and the first rotatable planar electrode are configured to be coupled to an external source. In addition, the apparatus includes a motor assembly including a motor and a first outer shaft coupled to the inner shaft. The rotating electrode assembly is configured to be removed from the housing when the inner shaft is decoupled from the first outer shaft.