TY - GEN
T1 - Electrochemical wastewater treatment
T2 - ISES Solar World Congress 2019, SWC 2019 and IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2019, SHC 2019
AU - Greenlee, Lauren F.
AU - Qing, Geletu
AU - Kékedy-Nagy, László
N1 - Funding Information:
LKN and LFG acknowledge the US National Science Foundation (NSF) for financial support of this work through the INFEWS/T3 Award # 1739473. GQ and LFG acknowledge the Hawaii Farm Bureau for financial support of this work through grant # 65587. The authors acknowledge the University of Arkansas Institute for Nanoscience and Engineering for support and access to characterization instrumentation.
Publisher Copyright:
© 2019. The Authors. Published by International Solar Energy Society Selection and/or peer review under responsibility of Scientific Committee
PY - 2020
Y1 - 2020
N2 - Electrochemical approaches and technologies have the potential to be used and applied to a wide range of water and wastewater treatment needs, particularly if these technologies are paired with a renewable energy source such as solar energy. Renewable-powered electrochemical technology can be used for rural, remote applications and in other scenarios where non-chemical approaches are desirable. Electrochemical technologies can also be potentially used where electrode and electrocatalyst design can be tailored to address specific treatment requirements, such as selective contaminant removal, resource recovery, and disinfection. The research results presented here focus on two applications of electrochemical technology to wastewater treatment: electrochemical precipitation of magnesium ammonium phosphate, known as struvite, for nutrient recovery and simultaneous ammonia oxidation and disinfectant generation for aquaculture wastewater. Experiments on electrochemical struvite precipitation comparing a pure magnesium and a magnesium alloy electrode demonstrated that the pure magnesium electrode produces more current; both anodes result in a crystalline struvite precipitate, as confirmed by x-ray diffraction. Cyclic voltammetry studies for aquaculture wastewater treatment using graphite and graphite-supported PtRu films as the anode demonstrate that the presence of PtRu reduces the voltage required for ammonia oxidation. When graphite is used as the cathode, the disinfectant molecule hydrogen peroxide is produced, suggesting electrochemical disinfection is possible in parallel with ammonia oxidation.
AB - Electrochemical approaches and technologies have the potential to be used and applied to a wide range of water and wastewater treatment needs, particularly if these technologies are paired with a renewable energy source such as solar energy. Renewable-powered electrochemical technology can be used for rural, remote applications and in other scenarios where non-chemical approaches are desirable. Electrochemical technologies can also be potentially used where electrode and electrocatalyst design can be tailored to address specific treatment requirements, such as selective contaminant removal, resource recovery, and disinfection. The research results presented here focus on two applications of electrochemical technology to wastewater treatment: electrochemical precipitation of magnesium ammonium phosphate, known as struvite, for nutrient recovery and simultaneous ammonia oxidation and disinfectant generation for aquaculture wastewater. Experiments on electrochemical struvite precipitation comparing a pure magnesium and a magnesium alloy electrode demonstrated that the pure magnesium electrode produces more current; both anodes result in a crystalline struvite precipitate, as confirmed by x-ray diffraction. Cyclic voltammetry studies for aquaculture wastewater treatment using graphite and graphite-supported PtRu films as the anode demonstrate that the presence of PtRu reduces the voltage required for ammonia oxidation. When graphite is used as the cathode, the disinfectant molecule hydrogen peroxide is produced, suggesting electrochemical disinfection is possible in parallel with ammonia oxidation.
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U2 - 10.18086/swc.2019.48.01
DO - 10.18086/swc.2019.48.01
M3 - Conference contribution
AN - SCOPUS:85086830189
T3 - Proceedings of the ISES Solar World Congress 2019 and IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2019
SP - 2359
EP - 2367
BT - Proceedings of the ISES Solar World Congress 2019 and IEA SHC International Conference on Solar Heating and Cooling for Buildings and Industry 2019
A2 - Cardemil, Jose Miguel
A2 - Guthrie, Ken
A2 - Ruther, Ricardo
PB - International Solar Energy Society
Y2 - 4 November 2019 through 7 November 2019
ER -