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A novel device to increase the electron sink in Metlands

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  • Amanda Prado de Nicolás, IMDEA WATER, Department of Chemical Engineering, Universidad de Alcalá, Spanien
  • Carlos A. Ramirez-Vargas
  • Carlos Alberto Arias
  • Abraham Esteve-Núñez, University of Alcalá, Department of Analytical Chemistry and Chemical Engineering, University of Alcalá, Spanien
Base on the concept of METland®, Microbial Electrochemical Wetland, this experiment has incorporated a novel device to increase the electron sink. Therefore, the efficiency of the wastewater treatment process improved.
Wastewater treatment is based on biological degradation of the sewage through oxidative reactions where microbes generate electrons. These treatments are usually limited by the availability of electron acceptors, such as oxygen. Microbes operating at METs, the so‐called electroactive bacteria (EAB), break down organic compounds while forming a biofilm on an electroconductive material. EAB are able of giving electrons extracellularly directly to the bed material. All those electrons are finally consumed by soluble electron acceptors present in the water. The presence of the conductive material has been proved to accelerate the biodegradation rate of bacteria through Direct Interspecies Electron Transfer (DIET).
In order to reduce the bottleneck that involves the electrons transport from the electroconductive bed to the last electron acceptor, electrons sink was designed. E-sinks were buried in the electroconductive bed, thus the concentration of electron acceptor in the system was increased. This allowed the degradation reactions of organic matter to be much faster throughout the electroconductive biofilter depth.
To evaluate the effect of these devices, three laboratory-scale electrogenic biofilters have been implemented each one with a different bed material coke, biochar and gravel. The systems were fed with urban wastewater and the efficiency was evaluated. For this purpose, different physical-chemical parameters have been measured, such as COD, BOD5, NH4+, NO3-, pH and conductivity. In addition, Electric Potential (EP) profiles were analyze in order to evaluate the electrons flow, depending on the electron acceptors available in the system.
TitelBook of Abstracts 8th International Symposium on Wetland Pollutant Dynamics and Control WETPOL 2019, 17 – 21 June, 2019, Aarhus University, Denmark
RedaktørerCarlos A. Arias, Carlos A. Ramírez-Vargas, Lorena Peñacoba-Antona, Hans Brix
Antal sider1
ForlagAarhus University
ISBN (trykt)978-87-971486-0-0
ISBN (Elektronisk)978-87-971486-1-7
StatusUdgivet - 2019
BegivenhedWETPOL2019: 8th International Symposium on Wetland Pollutants Dynamics and Control - Aarhus Universitet, Aarhus, Danmark
Varighed: 17 jun. 201921 jun. 2019
Konferencens nummer: 8


KonferenceWETPOL2019: 8th International Symposium on Wetland Pollutants Dynamics and Control
LokationAarhus Universitet

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