Development of a treatment train for the remediation of a hazardous industrial waste landfill leachate: A big challenge

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020

Autores

Segundo, IDB (Autor) Outra; Moreira, FC (Autor) Outra; Silva, TFCV (Autor) Outra; Webler, AD (Autor) Outra; Boaventura, RAR (Autor) Outra; Vitor Vilar (Autor) FEUP

Revista

Título: Science of the Total Environment

Vol. 741

ISSN: 0048-9697

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 4 Citações

Projetos Associados

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

Outras Informações

ID Authenticus: P-00S-BBQ

DOI: 10.1016/j.scitotenv.2020.140165

Abstract (EN): This study focuses on the development of a treatment train for a leachate from a hazardous industrial waste landfill (HIWL) previously treated by: (i) catalytic oxidation with hydrogen peroxide (H2O2) for sulphide and sulphite conversion into oxidized sulphur species, including sulphate, and (ii) chemical precipitation of sulphate as barite. The complete treatment line counted on four more stages: (iii) 1st biological oxidation for removal of biodegradable organic compounds and nitrogen species, (iv) coagulation with ferric chloride (coagulant dose of 100 mg Fe L-1, pH 2.8) for removal of a fraction of recalcitrant organics and suspended solids, (v) photo-Fenton oxidation using ultraviolet A (UVA) radiation (PF-UVA) (pH 2.8, initial total dissolved iron content of 140 mg L-1, treatment time of-4 h) for recalcitrant organics degradation and biodegradability improvement, and (vi) 2nd biological oxidation for removal of the biodegradable organic matter resulting from the PF-UVA process. The use of anodic oxidation or photoelectro-Fenton processes in stage (v) demonstrated to be unfeasible. A chemical oxygen demand (COD) below 1000 mg O-2 L-1, a common limit imposed by municipal wastewater treatment plants (MWWTPs) to effluents discharged into the municipal sewer, was achieved after a feasible treatment time (-4 h) using the multistep approach. The remediation of the HIWL leachate proved to be a big challenge.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11