Nyex-e

Nyex-e is Arvia’s technological solution based exclusively on chemical electro-oxidation obtained by applying a weak electric field between the Nyex-e electrodes thus generating the hydroxyl radical OH^– capable of oxidizing the polluting macromolecules present in the wastewater to be treated and breaking them down into H₂O , O₂ and CO₂.

The lamellar electrodes that represent the technological heart of the system are packaged inside an HDPE module that constitutes the discrete unit of the Arvia system. Depending on the type of application and the amount of pollutant that needs to be removed, multiple modules can be combined with one another to obtain the desired treatment capacity. The module is installed inside a reinforced fiber glass tank and the flow can pass through it from top to bottom or in the opposite direction, depending on the size and type of configuration chosen.

This technology is a viable alternative, with very low operating costs, to more conventional processes such as filtration on granular carbon and chemical precipitation, in which the regeneration procedure and the need to dispose the sludge resulting from the process epresent the main costs of the treatment stage. It also represents an alternative to the use of ozone, which usually requires highly specialized personnel for its use and high operating costs connected to the large electricity demand and the need of oxygen for the gas generation

The main application of the Nyex-e module is the removal of recalcitrant COD from streams of modest flow but high concentration (10,000 ppm), to reduce their values below 100 ppm. As the hydroxyl radical is not selective, it reacts indiscriminately on all the molecules that can be attacked. Depending on the type of wastewater to be treated and the type of pollutants to be removed, since it can tolerate a high input of COD values, the Nyex-e solution can be used as a polishing after a conventional biological stage. It can also replace the biological stage itself, by adding both the pre-treatment and finishing sections.

Main features:

• Particularly suitable for the polishing of concentrated industrial wastewater streams with low hydraulic flow rates
• It does not produce excess sludge to be sent to further treatment stages
• It does not use chemicals
• It is a modular system that is sized according to the flow rate and the pollutants to be removed
• The management and control operations required are simple and very limited