Water & Wastewater Treatment Magazine
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30 | DECEMBER 2018 | WWT | www.wwtonline.co.uk Innovation Zone Drinking water treatment Nyex (Arvia Technology) The Nyex treatment system is used to reduce hard-to-treat organics, micropollutants and colour from water and wastewater streams. The containerised units can be scaled to the application required, and Arvia has already reported successful results in removing micropollutants including metaldehyde to below 0.1µg/L. As well as drinking water treatment, Nyex has various other uses. For example, it can be added to the process train of a municipal wastewater treatment works to carry out a tertiary stage prior to discharge to the environment, or sited at a pesticide manufacturing plant to capture residues before they are released within effluent discharged to surface water. It is designed to combine the advantages of adsorption and oxidation within a single unit – water flows from the top of the unit through a bed of Nyex media. Contaminant organics are adsorbed onto the Nyex surface and a low voltage electric current is passed through, causing the adsorbed organics to be oxidised. Treated water flows from the bottom of the unit where it can either be safely used, re-used in- process or discharged to the environment. As it targets the organic rather than the entire body of water, treatment cost is proportional to the organic load. A er Anglian Water established Nyex's effectiveness in removing several trace substances from wastewater final effluent in trials, Scottish Water this year undertook the world's first long-term trial of the technology on drinking water at a specially established pilot plant in West Lothian, seeking to assess the effectiveness of the system in removing organic material from raw water. Bench trials have shown the Arvia system could remove 68 per cent of organic material from water. CarboPlus (Saur) Specifically developed to address pesticide issues, CarboPlus is an activated carbon treatment process for a broad range of micropollutants including metaldehyde, as well as precursors to trihalomethane (THM) and pharmaceuticals. It is a compact system that is located upstream of the final filtration stage and integrated into new or existing treatment units. The water is placed in contact with a large quantity of carbon, with new carbon regularly added in low quantities under a principle of continuous renewal, and the system's reactor separates the water and carbon using gravity, with the treated water exiting via ducts at the top. As well as a powdered activated carbon option that uses a small amount of polymer and Ferric chloride, CarboPlus can also be used with microgranular activated carbon, which requires no chemicals at all. Based on technology that was originally patented in 1995, CarboPlus is in use within industrial, wastewater as well as drinking water systems and has been adopted in over 20 different sites in France.