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oai:recercat.cat:10256/206652024-06-18T12:06:54Zcom_2072_452955com_2072_2054col_2072_453062

Electrified biotrickling filters as tertiary urban wastewater treatment Osset-Álvarez, Miguel Pous Rodríguez, Narcís Hasan, Shadi W. Naddeo, Vicenzo Balaguer i Condom, Maria Dolors Puig Broch, Sebastià Enginyeria ambiental Environmental engineering Bioelectroquímica Bioelectrochemistry Aigües residuals -- Depuració -- Desnitrificació Sewage -- Purification -- Nitrogen removal Nitrification-denitrification is a well-established method in wastewater treatment plants (WWTPs). Ammonium (NH4+) is oxidized to nitrate (NO3-) using oxygen (O2) as electron acceptor (nitrification) and NO3- is further reduced to dinitrogen gas (N2) under anoxic conditions using organic matter as electron donor (denitrification) [1]. However, secondary effluents can occasionally contain excessive nitrogen content [2]. Biofilters can be a suitable technology to reach the nitrogen standards, but the lack of electron donors in urban wastewater might hinder the performance of denitrification [3,4]. Microbial electrochemical technologies (MET) have been postulated as a promising alternative for nitrogen removal [5]. Full ammonium removal was reported for the first time in 2008 in METs [6]. Thereafter, different configurations have been studied. For example, simultaneous nitrification-denitrification was promoted in an aerated biocathode [7] or the integration of bioelectrochemical nitrogen removal in a WWTP configuration [8], among others. Following the principle of integrating METs into existing wastewater treatment technologies, electrified biotrickling filters (e-biofilters) aims at upgrading the current biotrickling filters by incorporating a submerged, electrified zone to promote bioelectrochemical denitrification [9]. Consequently, e-biofilters maintains nitrification activity and promotes denitrification processes in wastewaters with a low Carbon/Nitrogen ratio, such as secondary wastewaters. For this reason, this work assesses for the first time the application of an e-biofilter to treat the secondary effluent of an urban WWTP This research was carried out in the project “Wireless Aquaponic Farming in Remote Areas: A smart adaptive socio-economic solution” (WAFRA) funded within the 7th Framework Program (ERANETMED). The authors acknowledge funding from the Spanish Ministry of Science (PCI2018-092946). M. O-A. was supported by a grant from University of Girona (IFUdG2018/50). S.P. is a Serra Hunter Fellow (UdG-AG-575) and acknowledges the funding from the ICREA Academia award. LEQUIA has been recognized as a consolidated research group by the Catalan Government (2017-SGR-1552) 2021-12 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion peer-reviewed http://hdl.handle.net/10256/20665 http://hdl.handle.net/10256/20665 eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.cscee.2021.100143 info:eu-repo/semantics/altIdentifier/issn/2666-0164 Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess application/pdf Elsevier Case Studies in Chemical and Environmental Engineering, 2021, vol. 4, art.núm. 100143 Articles publicats (D-EQATA)