Incorporation of ozone-driven processes in a treatment line for a leachate from a hazardous industrial waste landfill: Impact on the bio-refractory character and dissolved organic matter distribution

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Inalmar D. Barbosa Segundo (Author) Other; Ana I. Gomes (Author) FEUP; Bianca M. Souza Chaves (Author) Other; Minkyu Park (Author) Other; André B. dos Santos (Author) Other; Rui Boaventura (Author) FEUP; Maria Francisca Moreira (Author) FEUP; Tânia F. C. V. Silva (Author) Other; Vítor J. P. Vilar (Author) FEUP

Journal

Title: Journal of Environmental Chemical Engineering

Vol. 9

Pages: 1-16

ISSN: 2213-3437

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 12 Citations

Associated Projects

LA LSRE-LCM - Financiamento Plurianual 2020-2023 para a Unidade LA LSRE-LCM Laboratório de Processos de Separação e Reacção - Laboratório de Catálise e Materiais

AIProcMat@N2020 - Advanced Industrial Processes and Materials for a Sustainable North Region of Portugal2020

Other information

Authenticus ID: P-00T-YJW

DOI: 10.1016/j.jece.2021.105554

Abstract (EN): The current work aimed to evaluate the feasibility of including ozone (O-3)-based advanced oxidation processes (AOPs), as an intermediate step, in a multistage treatment system for non-biodegradable sulphur-rich leachate from a hazardous industrial solid waste landfill (HISWL), combining chemical and biological oxidation technologies. O-3-based AOPs covered perozonation (O-3/H2O2), photo-assisted ozonation (O-3/UVC), and photoassisted perozonation (O-3/H2O2/UVC). All O-3-driven processes were applied to HISWL leachate directly after sulphur compounds removal via catalytic oxidation and chemical precipitation. Moreover, ozonation was also tested after a sequential coagulation step using ferric or aluminium salts (O-3/Fe2+ or O-3/Al3+), and O-3/H2O2/UVC system was likewise tried after Fe-mediated coagulation targeting photo-Fenton-assisted ozonation (O-3/PF). The best-performing treatment train encompassed: (i) catalytic oxidation with H2O2 (stoichiometric amount) under free pH, to convert sulphite and sulphide ions into oxidised sulphur species, including sulphate; (ii) chemical precipitation of sulphate as barite mineral without pH correction; (iii) O-3/H2O2 process for ca. 2.1-h (natural pH; room temperature; 3.5 kg O-3 and 1.1 kg H2O2 per m(3) leachate), to degrade refractory organic matter and improve biodegradability; and (iv) biological oxidation to remove the remaining bioavailable organics fraction. This four-stage approach allowed shifting from a highly recalcitrant wastewater to an effluent in full agreement with the regulation for industrial wastewater discharge into the municipal sewer network. Furthermore, the effectiveness of the O-3/H2O2 process over the dissolved organic matter transformation was corroborated by fluorescence excitation-emission matrix and size exclusion chromatography analysis.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16