Continuous Ammonia Recovery from Wastewaters Using an Integrated Capacitive Flow Electrode Membrane Stripping System

  • Changyong Zhang
    Changyong Zhang
    UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
  • Jinxing Ma
    Jinxing Ma
    UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
    More by Jinxing Ma
  • Jingke Song
    Jingke Song
    UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
    College of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, P. R. China
    Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, P. R. China
    More by Jingke Song
  • Calvin He
    Calvin He
    UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
    More by Calvin He
  • , and 
  • T. David Waite*
    T. David Waite
    UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
    *Phone/fax: +61-2-9385-5060; e-mail: [email protected]
Cite this: Environ. Sci. Technol. 2018, 52, 24, 14275–14285
Publication Date (Web):November 21, 2018
https://doi.org/10.1021/acs.est.8b02743
Copyright © 2018 American Chemical Society
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Abstract

We have previously described a novel flow-electrode capacitive deionization (FCDI) unit combined with a hydrophobic gas-permeable hollow fiber membrane contactor (designated “CapAmm”) and presented results showing efficient recovery of ammonia from dilute synthetic wastewaters (Zhang et al., Environ. Sci. Technol. Lett.2018, 5, 43–49). We extend this earlier study here with description of an FCDI system with integrated flat sheet gas permeable membrane with comprehensive assessment of ammonia recovery performance from both dilute and concentrated wastewaters. The integrated CapAmm cell exhibited excellent ammonia removal and recovery efficiencies (up to ∼90% and ∼80% respectively). The energy consumptions for ammonia recovery from low-strength (i.e., domestic) and high-strength (i.e., synthetic urine) wastewaters were 20.4 kWh kg–1 N and 7.8 kWh kg–1 N, respectively, with these values comparable to those of more conventional alternatives. Stable ammonia recovery and salt removal performance was achieved over more than two days of continuous operation with ammonia concentrated by ∼80 times that of the feed stream. These results demonstrate that the integrated CapAmm system described here could be a cost-effective technology capable of treating wastewaters and realizing both nutrient recovery and water reclamation in a sustainable manner.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.8b02743.

  • Details on the analytical methods and calculations, and further experimental data such as temporal variation of effluent conductivity using different carbon content, temporal variation of cathode pH in different operation scenario, variation of NH3–N (and NH4+) concentration in cathode chamber and acid chamber, distribution of ammonia, treatment of real domestic wastewater, urine, and long-term operation results of CapAmm (Figures S1–S12 and Table S1) (PDF)

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