| Title: |
ELECTROCHEMICAL RECOVERY OF NITROGEN AND HYDROGEN FROM URINE ; VALORISATION ELECTROCHIMIQUE DE L’AZOTE ET DE L’HYDROGÈNE CONTENU DANS L’URINE |
| Authors: |
Bastide, Stéphane; Benyahia, Raihana; Rebiai, Lamia; Bah, Kadiatou; Muller-Bouvet, D.; Torralba, E.; Cachet‐vivier, Christine; Akkari, Sophia; Sánchez-Sánchez, Carlos, M; Hopsort, Guillaume; Loubière, Karine; Latapie, Laure; Groenen Serrano, Karine; Tzedakis, Theodore; López Viveros, Melissa; Azimi, Sam; Rocher, Vincent |
| Contributors: |
Institut de Chimie et des Matériaux Paris-Est (ICMPE); Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS); Centre National de la Recherche Scientifique (CNRS); Laboratoire Interfaces et Systèmes Electrochimiques (LISE); Institut de Chimie - CNRS Chimie (INC-CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS); Laboratoire de Génie Chimique (LGC); Université Toulouse III - Paul Sabatier (UT3); Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP); Communauté d'universités et établissements de Toulouse (Comue de Toulouse); SIAAP - Direction du Développement et de la Prospective; Syndicat interdépartemental pour l'assainissement de l'agglomération parisienne (SIAAP); ANR-19-CE04-0009,HYUREA,PRODUCTION D'HYDROGENE PHOTOASSISTEE PAR OXYDATION DE L'UREE(2019) |
| Source: |
Innover dans les pratiques d’exploitation et de maintenance pour l’assainissement de demain. Enseignements scientifiques et techniques de la phase IIdu programme Mocopée (2018-2022) ; https://hal.science/hal-04298155 ; Innover dans les pratiques d’exploitation et de maintenance pour l’assainissement de demain. Enseignements scientifiques et techniques de la phase II du programme Mocopée (2018-2022), Axe 4 (Chapitre 3), Editions Johanet, pp.256-267, 2023, 979-10-91089-48-7 ; https://www.editions-johanet.net/ |
| Publisher Information: |
CCSD; Editions Johanet |
| Publication Year: |
2023 |
| Collection: |
Université Toulouse III - Paul Sabatier: HAL-UPS |
| Subject Terms: |
urée; urine synthétique; électrolyse; alcalinisation; hydrogène; [CHIM.CATA]Chemical Sciences/Catalysis; [CHIM.MATE]Chemical Sciences/Material chemistry |
| Description: |
Trame des chapitres de l’ouvrage de fin de phase II - Mocopée ; International audience ; Most of the nitrogen present in wastewater is in its ammoniacal form (NH4+) and originates from the urea in human urine. It is mainly treated biologically in wastewater treatment plants, requiring energy for aeration and producing intermediate forms such as nitrous oxide or nitrite. In the case of a collection of this nitrogen in the form of urea, a treatment by electrochemistry would allow both its oxidation into dinitrogen and the production of a renewable energy source, hydrogen, according to the ideal reaction: CO(NH2)2 + H2O -> CO2 + N2 + 3 H2In order to evaluate the interest of such a process, we have carried out research within the framework of the ANR HYUREA project (2020-24). The aim of this chapter is to present the principles and results concerning the thermodynamic data, the identification of the electrochemical reactions involved and the reaction products formed under different operating conditions. Our studies have shown the necessity of an initial alkalinization of urea with an optimal NaOH concentration NaOH of 1 mol L-1. This initial step makes it possible to recover 45% of the phosphorus present in the urine in the form of: Ca5(PO4)3OH + Mg(OH)2. With "ideal" short-time electrolysis (1 h), the formation of nitrite and N2 is observed, with respective faradaic yields of ~70% and ~25%. However, long-time electrolysis (~40 h), which is required to remove a significant amount of urea shows however that other products such as ammonia and cyanates are formed. The removal of urea takes place at a lower anode potential than for water electrolysis, with an energy gain of 19% for H2 production. Thus, if the concept of a process to remove urea while producing H2 is validated, research must be conducted to promote N2 production as the primary oxidation pathway. ; La majorité de l’azote présent dans les eaux usées est sous sa forme ammoniacale (NH4+) et a pour origine l’urée provenant de l’urine humaine. Sous cette ... |
| Document Type: |
book part |
| Language: |
French |
| Availability: |
https://hal.science/hal-04298155; https://hal.science/hal-04298155v1/document; https://hal.science/hal-04298155v1/file/Mocopee_OuvragePhase2_HYUREA%20VF.pdf |
| Rights: |
info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.9876C0B3 |
| Database: |
BASE |