Functionalization of sewage sludge char by partial oxidation with molecular oxygen to enhance its adsorptive properties

Atienza-Martínez, M. ; Binti Suraini, N.N. ; Ábrego, J. (Universidad de Zaragoza) ; Fonts, I. ; Lázaro, L. (Universidad de Zaragoza) ; Carstensen, H.H. ; Gea, G. (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

DOI: 10.1016/j.jclepro.2020.125201

Año: 2020

Publicado en: Journal of Cleaner Production 290, 125201 (2020), [12 pp]
ISSN: 0959-6526

Factor impacto JCR: 9.297 (2020)

Categ. JCR: ENGINEERING, ENVIRONMENTAL rank: 6 / 53 = 0.113 (2020) - Q1 - T1
Categ. JCR: GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY rank: 3 / 43 = 0.07 (2020) - Q1 - T1
Categ. JCR: ENVIRONMENTAL SCIENCES rank: 18 / 272 = 0.066 (2020) - Q1 - T1

Factor impacto SCIMAGO: 1.937 - Environmental Science (miscellaneous) (Q1) - Strategy and Management (Q1) - Renewable Energy, Sustainability and the Environment (Q1) - Industrial and Manufacturing Engineering (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/Construyendo Europa desde Aragón
Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/T22-17R
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/CTQ2016-76419-R

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)
Área (Departamento): Área Tecnologi. Medio Ambiente (Dpto. Ing.Quím.Tecnol.Med.Amb.)