Treatment of Organics in Wastewater Using Electrogenerated Gaseous Oxidants

Autor(es)

da Silva, Leticia Mirella ; Mena, Ismael F. ; Saez, Cristina ; Motheo, Artur J. ; Rodrigo, Manuel A.

• Tipo de documento: Artigo Científico
• Fonte: Industrial & Engineering Chemistry Research; v. 63, n. 15, p. 9-pg., 2024-04-09.

Resumo

This work focuses on the comparison of the performance of direct electrochemical oxidation with indirect electrolysis mediated by gaseous oxidants in the treatment of diluted wastewater. To do this, energy consumptions of the electrolysis using mixed metal oxide (MMO) electrodes are compared with those required for the production and use of chlorine dioxide in the degradation of methomyl contained in aqueous solutions. Results demonstrate the feasibility of the mediated oxidation process and that this process is competitive with direct oxidation. The oxidants are produced under optimized conditions using the same anodic material applied for the direct degradation of organics, thus avoiding efficiency losses associated with mass transfer limitations in the degradation of dilute organic solutions. Thus, using the ClO2 gaseous oxidant, a concentration of 0.1 mM of methomyl from a solution containing 500 mL is completely removed with an energy consumption as low as 50 Wh. The application of the same energy to a direct electrolytic process for treating the same wastewater can only reach less than half of this removal. These findings may have a very important application in the use of electrochemical technology to achieve the remediation of persistent pollutants in wastewater, where their low concentrations typically make direct processes very inefficient. (AU)

• Processo FAPESP: 17/10118-0 - Estudo e aplicação da tecnologia eletroquímica para a análise e a degradação de interferentes endócrinos: materiais, sensores, processos e divulgação científica
• Beneficiário: Marcos Roberto de Vasconcelos Lanza
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 21/06908-0 - Tratamento eletroquímico para remoção de carbamatos de solo contaminado
• Beneficiário: Leticia Mirella da Silva
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 18/26475-9 - Avaliação e aplicação de eletrodos de misturas de óxidos e de diamante dopado com boro para a degradação de compostos orgânicos com atividade de interferência endócrina
• Beneficiário: Leticia Mirella da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto