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Efficient ammonia recovery from wastewater using electrically conducting gas stripping membranes

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Abstract

Recovery of nutrients, such as ammonia, from wastewater offers an attractive approach to increase the overall sustainability of waste management practices. Conventional wastewater treatment processes require significant energy input, and the useful form of nitrogen (ammonia), is usually lost. Ammonia, a major component of fertilizers, is conventionally manufactured using the Haber–Bosch process, which accounts for approximately 2% of worldwide energy demand. A better approach would efficiently capture ammonia directly from the wastewater. In this study, ammonia is recovered directly by using an electrically conducting gas-stripping membrane that is immersed into a wastewater reactor. Under cathodic potentials, these membranes were used to facilitate conversion of ammonium (NH4+) into ammonia (NH3), which was then extracted by either circulating an acid solution or by applying a vacuum on the back side of the membrane. The mechanism involves water electrolysis, which generates OH, and transforms ammonium to ammonia that is stripped through the membrane. By engineering the surface and transport properties of the membrane 68.8 ± 8.0 g N per m2 d−1 of ammonia was recovered, with an energy consumption of 7.1 ± 1.1 kW h kg−1 N.

Graphical abstract: Efficient ammonia recovery from wastewater using electrically conducting gas stripping membranes

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Supplementary files

Article information


Submitted
15 Nov 2019
Accepted
12 May 2020
First published
13 May 2020

Environ. Sci.: Nano, 2020, Advance Article
Article type
Paper

Efficient ammonia recovery from wastewater using electrically conducting gas stripping membranes

A. Iddya, D. Hou, C. M. Khor, Z. Ren, J. Tester, R. Posmanik, A. Gross and D. Jassby, Environ. Sci.: Nano, 2020, Advance Article , DOI: 10.1039/C9EN01303B

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