Electrochemical advanced oxidation processes (EAOPs) as alternative treatment techniques for carwash wastewater reclamation

Autor(es)

Ganiyu, Soliu O. ^[1] ; dos Santos, Elisama Vieira ^[2] ; Tossi de Araujo Costa, Emily Cintia ^[1] ; Martinez-Huitle, Carlos A. ^{[1, 3]}

Afiliação do(s) autor(es)

^[1] Univ Fed Rio Grande do Norte, Inst Chem, BR-59078970 Natal, RN - Brazil

^[2] Univ Fed Rio Grande do Norte, Sci & Technol Sch, BR-59078970 Natal, RN - Brazil

^[3] UNESP, Inst Chem, Toxicol Evaluat & Removal Micropollutants & Radio, Natl Inst Alternat Technol Detect, DATREM, POB 355, BR-14800900 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Chemosphere; v. 211, p. 998-1006, NOV 2018.
• Citações Web of Science: 8

Resumo

Electrochemical advanced oxidation processes such as electrooxidation (EO), electrooxidation witt hydrogen peroxide generation (EO-H2O2) and electro-Fenton process (EF) have been investigated as alternative treatment techniques for complete removal of anionic surfactants and organic matters from real carwash wastewater. The electrochemical processes were performed with acidified real carwash wastewater using boron doped anode and carbon felt cathode. In all cases, the chemical oxygen demand (COD) removal efficiency was always increased with rise in applied current and complete organic matter decay was achieved at applied current of 500 mA or above after 6 h of electrolysis. Faster and higher COD decay was observed with EF compared to either EO or EO-H2O2 treatment, at all currents and electrolysis time. Besides, complete degradation of anionic surfactants the major organic content of the wastewater could be achieved at all applied currents studied irrespective of the process used, indicating the efficacy of processes for total remediation of real carwash wastewater. The short-chain carboxylic acids formed as the final organic byproducts were identified and quantified by ion-exclusion chromatography More so, lower energy consumption and higher current efficiency were achieved with EF compared to EO-H2O2. Electrochemical treatment was found to be a powerful technology for the complete abatement of organic matter in carwash wastewater for possible reuse. (C) 2018 Published by Elsevier Ltd. (AU)

• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático