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A novel electrochemical reactor for nitrogen and phosphorus recovery from domestic wastewater

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Abstract

To separate and concentrate NH4+ and PO4 3– from the synthetic wastewater to the concentrated solution through a novel electrochemical reactor with circulated anode and cathode using the difference of the concentration between electrode chamber and middle chamber.In recent years, the research on electrochemical processes have been focused on phosphate and ammonium removal and recovery. Among the wide range of possibilities with regards to electrochemical processes, capacitive deionization (CDI) saves the most energy while at the same time does not have continuity and selectivity. In this study, a new electrochemical reactor with electrolyte cyclic flowing in the electrode chambers was constructed to separate and concentrate phosphate and ammonium continuously and selectively from wastewater, based on the principle of CDI. At the concentration ratio of NaCl solution between the electrode chambers and the middle chamber (r) of 25 to 1, phosphate and ammonium in concentration level of domestic wastewater can be removed and recovered continuously and selectively as struvite. Long-term operation also indicated the ability to continuously repeat the reaction and verified sustained stability. Further, the selective recovery at the certain r could also be available to similar technologies for recovering other kinds of substances.

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Acknowledgements

This research was supported by the Key Program of the National Natural Science Foundation of China (Grant Nos. 51238004 & 21521064).

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Correspondence to Peng Liang or **a Huang.

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Ren, S., Li, M., Sun, J. et al. A novel electrochemical reactor for nitrogen and phosphorus recovery from domestic wastewater. Front. Environ. Sci. Eng. 11, 17 (2017). https://doi.org/10.1007/s11783-017-0983-x

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  • DOI: https://doi.org/10.1007/s11783-017-0983-x

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