Concentration and oxidation are two principles traditionally used for the treatment of recalcitrant organic compounds in wastewater. These processes destroy toxic compounds but are often costly, require highly reactive and hazardous chemicals, and are usually limited by mass transport considerations, particularly at low and trace concentrations.
Arvia has developed a process that combines the benefits of concentration and oxidation: adsorption coupled with electrochemical oxidation to regenerate the adsorbent. This delivers a process where the organics are concentrated onto the surface of a conducting, carbon-based adsorbent (eliminating the mass transport limitations), but then oxidizes the organic to carbon dioxide and water through electrochemical oxidation (which regenerates the adsorbent for reuse). They have developed the process such that adsorption and regeneration can be achieved continuously and simultaneously.
The significant benefits resulting from this combination of processes include the production of higher quality effluent, the destruction of organics, no sludge or waste stream is produced, no chemicals are used, and the process is scalable, modular, and low maintenance.
An additional benefit in an early stage of development is the potential of the process to achieve microbial reduction. This is beneficial if the water is intended for reuse as it prevents a buildup of bacteria in the system which would otherwise need to be reduced using chemical biocides.