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Capacitive deionization for nutrient recovery from wastewater with disinfection capability

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Abstract

This study demonstrates that capacitive deionization can be effectively used for the removal and recovery of dominant nitrogen (ammonium) and phosphorus (phosphate salts) species present in wastewater. Moreover, low concentrations of chlorine and other oxidants can be generated in situ for disinfection. With an applied voltage from 1.2 V to 3.0 V, salts, ammonium, and phosphorus can be quickly removed from water and adsorbed on the electrodes due to the formation of an electrical double layer, and results show that the removal efficiency was 77.5–91.2% for salts, 60.5–95.7% for ammonium, and 46.4–80.7% for phosphorus, respectively. In addition, most of the adsorbed ions are released back to the concentrate during regeneration, so high nutrient recovery can be accomplished as well. Such a simple electrochemical process can be promising to solve both nutrient and salinity problems after biological treatments for discharge and reuse, and the additional disinfection function adds further benefits to improve water quality and safety with low cost.

Graphical abstract: Capacitive deionization for nutrient recovery from wastewater with disinfection capability

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Publication details

The article was received on 05 Sep 2017, accepted on 17 Oct 2017 and first published on 17 Oct 2017


Article type: Communication
DOI: 10.1039/C7EW00350A
Citation: Environ. Sci.: Water Res. Technol., 2018, Advance Article
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    Capacitive deionization for nutrient recovery from wastewater with disinfection capability

    Z. Ge, X. Chen, X. Huang and Z. J. Ren, Environ. Sci.: Water Res. Technol., 2018, Advance Article , DOI: 10.1039/C7EW00350A

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