'Revolutionary' AOP treatment system trials prove a success
Trials of a revolutionary treatment system that can remove water contaminates to within safe regulatory limits have been completed successfully by Xylem. The eight-month trial, which was completed in partnership with Anglian Water Innovations, involved the use of ozone oxidation, in combination with hydrogen peroxide, to create an Advanced Oxidation Process (AOP).
The objective of the trial was to establish whether the Xylem AOP system, called Promix, is capable of removing background and spiked levels of contaminants, such as Metaldehyde and Clopyralid, from surface water.
Also, the trial was tasked with assessing Promix’s ability to maintain bromate levels below 5µg/l. When oxidised, bromide becomes bromate, which is a human carcinogen and a listed compound by the World Health Organisation and the US Environmental Protection Agency.
Tony Swierk, ozone sales manager at Xylem, said: “The trial clearly demonstrated that when applying relatively high ozone doses in the range of 8-10mg/l provided reduction rates on Metaldehyde of approximately 70-75%. At similar dose rates, approximately 50% reduction of Clopyralid was achieved. At dose ratios of 2.5:1 (H2O2/O3) bromate levels did not exceed 5µg/l at any stage.”
Swierk said: “The increasing concentrations of contaminates are a major concern for UK water companies, who face significant financial penalties from the regulator if they fail to comply. There was some scepticism about the abilities of the AOP Promix system to reduce contaminates without increasing levels of bromate. The results conclusively prove that Promix is a viable option for water companies to reduce contamination without fear of increasing bromate levels.”
Promix works by progressive mixing of the applied ozone through five in-line mixer elements, ensuring virtually no residual ozone is carried forward. Bromate formation can therefore be managed to well below the regulatory level.
Emerging contaminates in the form of pesticides, pharmaceuticals and personal care products are an increasing concern for water companies, who are under pressure to remove contaminates down to below the required regulatory level.
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