108532 20220511133136.0 doi 10.1016/j.jclepro.2020.125201 sideral 122440 ART-2020-122440 eng Atienza-Martínez, M. (orcid)0000-0002-5047-5106 Functionalization of sewage sludge char by partial oxidation with molecular oxygen to enhance its adsorptive properties 2020 Access copy available to the general public Unrestricted This study investigates the activation of sewage sludge char through partial oxidation with molecular oxygen with the goal to increase the concentration of oxygen-containing surface functional groups and to enhance its ammonium adsorption capacity. The effects of oxidation temperature (200–350 °C), oxygen concentration (5–21 vol %) and oxidation time (30–120 min) on the degree of char oxidation are analyzed. The results obtained by thermogravimetric and elemental analysis, and Fourier Transform Infrared and X-ray Photoelectron spectroscopy corroborate the incorporation of oxygenated functional groups on the surface of sewage sludge char either at low temperature (200 °C) using air or at higher temperature (350 °C) using 5% O2 for 30 min. The oxidation of sewage sludge char hardly increases its specific surface area. The operating conditions during oxidation must be carefully controlled to avoid runaway reactions that lead to total oxidation of char. The evolution of CO and CO2 during oxidation is a good indicator of the advance of the oxidation/burn-off reactions. The ammonium adsorption capacity of sewage sludge char increases after oxidation under mild operating conditions, providing support to the idea of onsite utilization of sewage sludge as ammonium adsorbent in waste water treatment plants. This would provide a step forward towards the implementation of a circular economy. info:eu-repo/grantAgreement/ES/DGA-FEDER/Construyendo Europa desde Aragón info:eu-repo/grantAgreement/ES/DGA-FEDER/T22-17R info:eu-repo/grantAgreement/ES/MINECO-FEDER/CTQ2016-76419-R info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 9.297 2020 ENGINEERING, ENVIRONMENTAL 6 / 53 = 0.113 2020 Q1 T1 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY 3 / 43 = 0.07 2020 Q1 T1 ENVIRONMENTAL SCIENCES 18 / 272 = 0.066 2020 Q1 T1 1.937 2020 Environmental Science (miscellaneous) 2020 Q1 Strategy and Management 2020 Q1 Renewable Energy, Sustainability and the Environment 2020 Q1 Industrial and Manufacturing Engineering 2020 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Binti Suraini, N.N. Ábrego, J. Universidad de Zaragoza (orcid)0000-0003-4493-6540 Fonts, I. (orcid)0000-0001-7035-1955 Lázaro, L. Universidad de Zaragoza (orcid)0000-0001-8797-936X Carstensen, H.H. (orcid)0000-0003-0501-7605 Gea, G. Universidad de Zaragoza (orcid)0000-0002-4364-2535 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 290, 125201 (2020), [12 pp] J. clean. prod. Journal of Cleaner Production 0959-6526 903279 http://zaguan.unizar.es/record/108532/files/texto_completo.pdf Postprint 2776876 http://zaguan.unizar.es/record/108532/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:108532 articulos driver 2022-05-11-13:14:28 ARTICLE