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2015|16 Annual Report Fraunhofer IGB - ePhos® – ELECTROCHEMICAL RECOVERY OF PHOSPHORUS

113 3 4 5 Dr.-Ing. Iosif Mariakakis Phone +49 711 970-4231 Dipl.-Ing. Siegfried Egner Phone +49 711 970-3643 Contact Project partner Ovivo LLC, Austin, USA obtained which can then be used directly as a fertilizer. The total quantity of chemicals that would have to be used at the treatment plant would decrease by 40 tons or 20 percent per year. Industrial-scale implementation with flat-panel reactors ith the results from the first pilot tests, in which tubular electrolytic cells were used (Fig. 3), the process was further developed with flat-panel reactors for industrial use ig t the WEFTEC (Water Environment Federation’s Annual Techni- cal Exhibition and Conference) in October 2015 we presented the process for market launch in the USA. Biological phospho- rus elimination with subsequent stabilization of the biomass in anaerobic stages is being employed to an increasing extent at sewage treatment plants in North America. In this method of operation, phosphorus has to be specifically removed from the sewage treatment process to avoid uncontrolled precipita- tions in the filtrate water pipes and sludge dewatering e uip- ment, which otherwise would cause enormous damage and operating costs. Advantages and outlook The ePhos® plant concept is based on the series connection of electrolytic cells in parallel (Fig. 5). As this is a purely electro- chemical process, the cells or cell pathways can be switched on or off by a process control system depending on the demand This beneficial mode of operation and the efficient, chemical-free operation represent unique selling propositions that insure competitiveness. License agreements for industrial use are at present being concluded with interested parties. The first industrial-scale plant in the is to be built and put into operation by the end of 2016. In the future, further process modules will be added to the ePhos® process in order to achieve sustained cycle management of the nutrients at sewage treatment plants. 1 Recovered struvite. 2 The basic principle of the ePhos® process. 3 The ePhos® pilot plant for electrochemical phosphorus precipitation with tubular reactors. 4 An enhanced ePhos® pilot testing with flat-panel reactors. 5 Planning study of an industrial-scale ePhos® plant for a sewage treatment plant with 70,000 PE to recover approx. 73 t/a struvite from 200 m3 /d filtrate water with 250 mg/L orthophosphate. 345 Phone +49711970-4231 Phone +49711970-3643