Explore Mechanism, Features, Advantages, Applications of Electro Oxidation For Wastewater Treatment
Electro Oxidation Wastewater Treatment
In this content, Evoaeo team members have a brief introduction about the pathways/mechanisms, features and advantage, and current and potential application areas, challenges and drawbacks of electro oxidation wastewater treatment techniques, did not miss the key factors impact the treatment efficiency, objectives, and target of this EO technology, what is more, our comprehensive solution with appliable strategies we can offer to mitigate challenges, maximum treatment efficiency, and reduce energy consumptions.
Electro oxidation, also named electrochemical advanced oxidation processes ( EAOPs), or anodic oxidation, one of most innovative and advanced wastewater treatment techniques amongst advanced oxidation processes (AOPs) that adopted to mineralize refractory organic contaminants in complex industrial effluents. Unlike conventional biological treatment methods and advanced oxidation processes, electro oxidation can remove most of the reclatriant organic compounds that resistant to conventional biological treatment methods, what is more, electro oxidation treatment processes does not require extra chemicals and there will be no or few sludge generated from the mineralization processes, it requires electrochemical cell setup, electrodes, electricity input, and electro oxidation/reduction reactions within the electrolysis processes.
How Does Electro Oxidation Wastewater Treatment Works? The Mechanism
Electro oxidation treatment of wastewater comes with two parts when it comes to oxidation processes: direct and indirect oxidation, in this section, Evoaeo team explains how these two pathways and mechanisms enhance the comprehensive capability and efficiency when it comes refractory organic compounds mineralization and eventually complete removal.
Once electricity applied, electrons trafer between the electrolyte and anode, certain types of organic pollutants can be oxidized directly on the surface of the anode via a direct electron transfer from their molecules directly to the electrode surface, this oxidation processes happens directly without involves of active intermediates/oxidants, for instance, reactive oxygen species or other oxidizing agents. Indirect oxidation invloves electrochemical generation of reactive oxidizing agents, for instance, hydroxyl radicals (OH), it’s a reactive oxygen specie with higher oxidation potential amongst its types and other highly active radicals, and then sulfate radicals (SO) within the electrolytic reaction processes. These radicals can mineralize lots of organic compounds by breaking chemical bonds such as C-C, C-N, and etc, degrade these compounds into ingranic forms or simpler organic compounds/intermediates with smaller molecules for much further mineralization via a vast variety of pathways, instead of concentrating, EO usually does not for further treatment afterwards.
Main Factors Affect Electro Oxidation Wastewater Treatment Efficiency
We discussed about the mechanisms of electro oxidation wastewater treatment processes within the previous section of this page, within the previous section. In this part, we will cover main factors affect electro oxidation wastewater treatment efficiency, mainly based on our years of experiences with electro oxidation treatablity test, wastewater treatment product research and development processes, and implement of electro oxidation wastewater treatment products, from trial scale, to pilot scale industrial wastewater treatment projects. Check the key points affect electro oxidation wastewater treatment efficiency we listed below:
Electrode materials
People in water and wastewater treatment industry and electrochemical research niche have adopted a vast variety of electrode materials for electro oxidation wastewater treatment processes, factors such as: Capability of electrochemical generation of oxidizing agents, which eventually affects the comprehensive organic compounds removal efficiency as different electrode has different surface property and electro-catalytic activity. Chemical and mechanical robust, electrodes with stable chemical and mechanical stability can emit constant and stable performance within the electrolytic processes, and that means less chance of fouling. Stainless steel, platinum, lead dioxide (PbO2), mixed metal oxide(MMO), titanium, and boron-doped diamond (BDD) electrodes and etc, are adopted to conduct electro oxidation wastewater treatment, we will resume dicussions about comparison of different electrode materials in electro oxidation application in other contents.
Surface area
Actually electro oxidation reaction efficiency will be affected by the surface area of an electrode, as active area of electrodes, electron transfer, and larger surface area means enhanced electro oxidation of refractory organic compounds within the electrolyte (wastewater), therefore improve the comprehensive oxidation efficiency, yes, as you may have noticed from the previous section, surface area is one of those factors impact direct and indirect oxidation.
Wastewater compositions
Characteristics such as oxidation potentials, potential to be degraded into intermediates, or inorganic matters, are different amongst different type of organic pollutants, and ions in the waste streams might affect the conductivity of the electrolytes, therefore it’s critical to conduct treatability testing prior to electro oxidation technology implement in actual wastewater treatment, that is to identify the content of the wastewater you need treat, via electro oxidation.
pH level
Hydroxyl radicals are the major group of reactive oxygen species mineralize organic compounds within the electro oxidation processes, and yes, pH level within the electrolyte (wastewater) does affect the electrochemical generation of these active oxidizing agents on the surface of anode, as hydroxyl radicals will be more prevailing in alkaline conditions, according to our tests.
Current density
Current density reflects the mass transfer of electron, as current density could actually affect the efficiency of direct oxidation, transfer of electrode, therefore it’s critical to keep some mediate current density to expedited oxidation reaction rate, but yet, minimize chances of undesired oxygen evolution, that is the key to constant electro generation of reactive oxygen species.
Electrochemical cell design
Electrochemical cells are critical when it comes to implements of electro oxidation wastewater treatment processes, as they are the main spaces for electrolytic processes, and distance between electrodes, active electrode surface area, cell holding space, flow rate, initial COD level, hydraulic retention time, and COD removal efficiency.
Features & Advantages of Electro Oxidation Wastewater Treatment
Environmental friendly
Redox reagents used to mineralize organic pollutants anre electrochemically generated during the wastewater electrolysis processes,which means electro oxidation doesn't require the addition of toxic chemicals, while our team add salts such as Na2SO4, NaCl, etc., in practical application of electrochemical oxidation of organic compounds to improve conductiviy if it's a low conductive solutions..
Efficiency
Electro oxidation is highly efficient when it comes to removal of various types of organic compounds found in waste streams from different industries.
Easy operation and automate,modular design
Given its mediate requirement toward operation conditions, ease to add automatic operator access, modularized design to fit into various scales of wastewater treatment needs, electro oxidation is a great option for complex wastewater treatment projects.
Less chance of sludge generation
Unlike other advanced oxidation processes (AOPs) such as Potassium permanganate oxidation and Fenton processes (an Iron-based AOPs treatment method), electro oxidation has no or few byproducts when it comes to sludge formation.
Electro Oxidation Wastewater Treatment Application Ranges
Electro oxidation wastewater treatment can be applied to treat complex wastewater.
Wastewater with different pH level (except those with fluoride ion)
Organic wastewater with high salinity, higher salt content means higher conductivity
Further treatment of concentrate after membrane, MVR, RO
Wastewater contain toxic CN-, NaN3, organophosphorus, organic sulfur
Various types of water defined as hazardous waste streams
Improve effluents quality, COD level to compliance with regulations
Organic wastewater with organic pollutants can not treated via conventional biological and advanced oxidation processes treatment methods.
Electro Oxidation Wastewater Treatment Efficiency & Results
Check the charts below to find out treatment efficiency and results of electro oxidation wastewater treatment technology, share your water profile to get an assessment over your industrial effluents, it’s free of charge, we offer not only treatment methods, but also a comprehensive solution, service to various industries.
Electro Oxidation Wastewater Treatment Products
We spent years on research of electro oxidation wastewater treatment technology, with years of experiences of persistant prototyping and developing elecrto oxidation wastewater treatment products, and deep comprehension of electrode material selection, electrode surface area optimizations, electrochemical cell and reactor set-up, electrolytic processes optimization, treatment objects optimizations, flow rate fluctuation, COD removal efficiency, energy efficiency, and etc. Evoaeo is one of the major manufacturers who can supply a full scale electro oxidation wastewater treatment products to meet specific requirement in different practical applications, join us to explore electro oxidation water treatment products.
Electro Oxidation Wastewater Treatment Electrode Material
Key factors to consider about while selecting an electrode material for electro oxidation water treatment: Electrode materials for electro oxidation or electrolytic treatment processes are usually fabricated with conductive metal substrate, while external part are coated with reactive catalyst material, given the truth that oxidizing agents are critical for electrolytic treatment processes, capability of massive electrochemical generation of hydroxyl raidals (•OH) is one of major factors to consider when it comes to electrode material selection. Reactivity ranking of different electrode from the lowest to the highest, active electrodes such as tin oxide, lead dioxide (PbO2), iridium oxide (IrO2) non-active electrodes such as Pt (platinum), and boron-doped diamond electrode (BDD) are selected for the electro oxidation treatment process.
Electrode materals with higher oxygen overpotential could not only emit higher oxygen evolution, which means these electrodes expdited electrochemical generation of hydroxyl radicals, but also reduce side reactions, for instance, oxygen generation, boron doped diamond electrode is one of electrode with the highest oxygen overpotential, which make it one of the most efficient anodes for eletro oxidation.Mixing For the most effective results, it’s often best to mix and match different electrode materials for each application. This can help to maximize reactivity while minimizing energy use and costs.
Boron doped diamond electrode is one of the non-active electrode materials with unmatched electrochemical and physical properties such as high stability, higher pontetial window/oxygen overpotential which means much higher efficiency when it comes to massive electrochemical generation of oxidizing agents, resistant to corrosion, with less chance of fouling, does not require regular replacing.
Electro Oxidation Wastewater Treatment Trial Test Module Electrochemical Reactor
The electro oxidation trial test module unit is an electrochemical reactor, it’s one of the most important electrochemical cell in our trial scale product line, designed exclusively for trial scale testing, treatability study over electro oxidation technology,enables users to evaluate the impact of this technology on water and wastewater treatment.
Equipped with premium quality boron-doped diamond (BDD) electrodes, and titanium cathodes, magnetic stirrer, AC power supply, and supporting accessories to improve efficiency of wastewater electrolysis processses. With a capacity of 1000 mL, sampling hole, minimized compact size, it serves as a testing equipment for trial scale electro oxidation treatment technique, it’s an ideal tool to conduct electro oxidation treatability trial for chemical and electrochemical research agencies, wastewater treatment product development laboratories, and water and wastewater treatment companies, environmental services.
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Electro Oxidation Trial Module Unit
Electro Oxidation Wastewater Treatment Portable Testing Kit
Electro oxidation portable testing kit is the latest electro oxidation equipment within the trial scale product line, with display panel, current/voltage control, ready to install input and output interface, this testing kit is the very first portable on-site electro oxidation treatment equipment designed for wastewater treatment plants, manufacturers, environmental services, wastewater management seeking effective and sustainable wastewater treatment methods prior to reuse or safely discharged into environment, and seeking balance between treatment objectives, efficiency, compliance with increasing regulations and environmental concerns.
Free Consultation Over Electro Oxidation Wastewater Treatment
Eavoaeo is a company specializes in offering solution to tackle the challenges from complex wastewater with our years of experiences with electro oxidation wastewater treatment technology, we offer customized solution to a vast variety of businesses and industries dealing with obstinate organic chemicals in their effluents. We offer free water profile analysis, contact our wastewater treatment experts now!
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Our EO wastewater treatment services also covers:
Industrial wastewater treatment
Facilitating safe water reuse
Ensuring compliance with discharge regulations
Reducing the need for wasteful wastewater incineration