Self-Cleaning Electro-Reaction Unit for Wastewater
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Solution Overview
Problem
Existing wastewater treatment systems using electro-reaction units (ERUs) face challenges with electrode passivation, requiring frequent maintenance and costly cleaning processes, especially in smaller systems without dedicated staff, as the formation of oxide layers on electrodes hampers continuous operation and efficiency.
Innovation Solution
A self-cleaning ERU design with a reaction chamber and a separation chamber, featuring a dedicated zone with movable hard elements that receive kinetic energy to constantly remove oxide layers and foulants from electrodes, allowing for continuous operation with minimal maintenance, using a single type of consumable electrodes to generate coagulation and oxidation species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electro-reaction units are used for wastewater treatment, then treatment effectiveness is improved, but electrode passivation occurs requiring frequent maintenance
Solution Approach 1:
The patent implements a self-cleaning mechanism where hard elements (such as sand or gravel) are circulated through the reaction chamber to automatically remove oxide layers and foulants from electrode surfaces. This self-service cleaning system eliminates the need for manual intervention and frequent maintenance, allowing the ERU to maintain treatment effectiveness continuously without human operation for cleaning.
Solution Approach 2:
The system performs preliminary cleaning action by continuously circulating hard elements through the reaction chamber before passivation significantly impacts performance. The hard elements constantly scour the electrode surfaces, preventing the buildup of oxide layers that would otherwise require frequent manual maintenance interruptions.
2Reliability
If manual cleaning interventions are implemented, then electrode performance is maintained, but operational continuity is disrupted and costs increase
Solution Approach 1:
The automated self-cleaning system using circulating hard elements performs electrode maintenance without requiring system shutdown or manual intervention. This maintains operational continuity while ensuring electrode performance is preserved through continuous automated cleaning during normal operation.
Solution Approach 2:
The patent replaces manual mechanical cleaning interventions with an automated mechanical cleaning system. Hard elements are pumped through the reaction chamber to automatically scour electrodes, substituting human-operated cleaning mechanisms with an automated system that maintains productivity and operational continuity.
3Reliability
If non-consumable anode material is used, then oxidation species generation is improved, but cost and complexity increase
Solution Approach 1:
The self-cleaning mechanism enables the use of simple, inexpensive consumable anode materials (such as iron or aluminum) to generate oxidation species. The automated hard element circulation continuously removes oxide layers from these consumable electrodes, allowing them to function effectively without requiring expensive non-consumable materials like boron-doped diamond, thereby reducing device complexity and cost.
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 self-cleaning ERU effectively maintains high treatment efficiency for a year without electrode replacement, achieving 99.99% pathogen kill and stable pollutant removal, reducing maintenance costs and extending operational periods, suitable for small-scale wastewater treatment systems.
Implementation Method 1
means for providing kinetic energy to the hard elements, thereby causing localized bombardment of the electrodes for constantly removing the undesired oxide layer and other foulants forming on the electrodes
Implementation Method 2
Electrical current (AC or DC) will cross the electrolyte (e.g. wastewater) from the anode to the cathode. The electric power circulating between the two electrodes of the electrolytic cell submerged in the wastewater generates, depending on the electrodes material, corrosion of the anode, wastewater decomposition by electrolysis and other electro-catalytic phenomena such as oxidation.
Implementation Method 3
other electro-catalytic phenomena such as oxidation
Implementation Method 4
The hard elements are movable therein and have a hardness at least greater than a hardness of an oxide layer forming on the electrodes
Data Source
AI summary
The present invention relates to the treatment of wastewater by electrochemical reactions. More particularly, an Electro-Reaction Unit (ERU) is disclosed. The ERU is provided with at least one electrolytic cell comprising a pair of self-cleaned electrodes for purifying wastewater. Along with electro-reactions, electrodes of the ERU are submitted to passivation, i.e. coverage with an oxide layer. The present invention provides a solution for alleviating passivation with a self-cleaning system comprising hard elements, confined in a cage and movable therein, for bombardment of the electrodes and rupture of the oxide layer. The present invention further provides a related process.