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CC BY-NC-ND V4.0, Open Access
Journal article
Bioelectrochemical extraction of ammonium from low-strength wastewater with concomitant generation of high-purity hydrogen
Environmental technology, ahead-of-print
2022
PMID: 36314060
Abstract
Bioelectrochemical systems (BES) are emerging environmental biotechnology for recovering ammonia from waste streams. It has been tested extensively for treating ammonium-rich wastewater. This study examined the suitability of BES to facilitate carbon removal and ammonium extraction from a low ammonium liquor (3.7 mM) that mimics municipal wastewater, and concomitant production of high-purity hydrogen gas, which could potentially be harnessed as a fuel or internally recycled for ammonia stripping. Results showed that a two-chamber cation exchange membrane-equipped BES enabled a high hydrogen yield (22.8 m(3) H-2 m(-3) d(-1); > 98% cathodic efficiency) and chemical oxygen demand (COD) removal (80%; 2.43 kg COD m(-3) d(-1) at a hydraulic retention time of 4.4 h). However, for the treatment of wastewater, the system demanded high energy (2.3 kWh kg COD-1; 152 kWh kg(-1) N removed) and base for pH adjustment. The technology may be more suitable for recovering ammonium from wastewaters with molar ammonium to BOD ratio closer to the desired stoichiometric ratio of four, and for waste streams containing sufficient alkalinity or pH-buffering capacity, eliminating the need for dosing cation-bearing alkali.
Details
- Title
- Bioelectrochemical extraction of ammonium from low-strength wastewater with concomitant generation of high-purity hydrogen
- Authors/Creators
- Ka Yu Cheng - CSIRO Land and WaterAnna H. Kaksonen - Commonwealth Scientific and Industrial Research OrganisationRalf Cord-Ruwisch - Murdoch Univ, Sch Engn & Informat Technol, Murdoch, WA, Australia
- Publication Details
- Environmental technology, ahead-of-print
- Publisher
- forma UK Limited, trading as Taylor & Francis Group
- Number of pages
- 12
- Identifiers
- 991005585963507891
- Copyright
- © 2022 Commonwealth Scientific and Industrial Research Organisation (CSIRO).
- Murdoch Affiliation
- School of Engineering and Energy
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.83 Bioengineering
- 3.83.1487 Microbial Fuel Cell
- Web Of Science research areas
- Environmental Sciences
- ESI research areas
- Environment/Ecology