2026-04-17T21:31:04Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/216122024-06-18T12:07:25Zcom_2072_452955com_2072_2054col_2072_453062

00925njm 22002777a 4500 dc Botti, Alberto author Pous Rodríguez, Narcís author Cheng, Hao-Yi author Colprim Galceran, Jesús author Zanaroli, Giulio author Puig Broch, Sebastià author 2023-01-01 Economic options to retrofit wastewater treatment plants (WWTPs) without tertiary treatments need to be explored. In this regard, bioelectrochemical systems (BES) can be hybridized with existing technologies, upgrading the removal performance of original techniques while avoiding replacement costs. Yet, few demonstrations of merged systems have been given. For the first time, in this work it was built a lab-scale model of a BES merged with a secondary settler, namely e-settler, to enhance the polishing performance of already existing WWTPs. In particular, to concomitantly increase nitrogen removal and perform wastewater (WW) disinfection, avoiding further tertiary treatments. In the e-settlers, nitrogen removal was increased through bioelectrochemical stimulation. Concomitant ammonium and nitrate removal without nitrite accumulation and a negligible amount of nitrous oxide emissions were observed. Ti-MMO as anode material showed a high disinfectant action. In conclusion, it was demonstrated how a simple bioelectrochemical set-up can upgrade existing WWTPs. The following step requires the study at a larger scale, identifying optimal operational and structural parameters for the in-situ application. The main limitations of the e-settlers were discussed, linking them to possible solutions that need to be deepened in a lab-scale model of conventional secondary treatments (activated sludge followed by secondary settler) This work was funded through: the ELECTRA project [grant agreement no. 826244], which was financially supported by the Horizon 2020 programme of the European Union; the NSFC-EU Environmental Biotechnology joint program (No. 31861133001); the Key Research and Development Project of Shandong Province (No. 2020CXGC011202). S.P is a Serra Húnter Fellow (UdG-AG-575) and acknowledges the funding from the ICREA Academia award. LEQUiA [2017-SGR-1552] has been recognized as consolidated research group by the Catalan Government Open Access funding provided thanks to the CRUE-CSIC agreement with Elsevier http://hdl.handle.net/10256/21612 Aigües residuals -- Plantes de tractament Sewage disposal plants Aigües residuals -- Depuració -- Desnitrificació Sewage -- Purification -- Nitrogen removal Electrifying secondary settlers to enhance nitrogen and pathogens removals