Stability and efficiency of Fe3+ EDDS complex for the treatment of secondary effluent in the photo-Fenton process

Autor(es)

Ahile, Ungwanen J. ^[1] ; Wuana, Raymond A. ^[2] ; Itodo, Adams U. ^[2] ; Sha'Ato, Rufus ^[2] ; Malvestiti, Jacqueline A. ^[3] ; Dantas, Renato F. ^[3]

Afiliação do(s) autor(es)

^[1] Benue State Univ, Dept Chem, PMB 102119, Makurdi - Nigeria

^[2] Univ Agr, Dept Chem, PMB 2373, Makurdi - Nigeria

^[3] Univ Estadual Campinas, UNICAMP, Sch Technol, Paschoal Marmo 1888, BR-13484332 Limeira, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Desalination and Water Treatment; v. 222, p. 366-374, MAY 2021.
• Citações Web of Science: 0

Resumo

This study focuses on the use of Fe3+ EDDS for degradation of methylene blue and wastewater disinfection using the photo-Fenton process. The stability of Fe3+ EDDS was tested at different pH values ranging from 4 to 11. The study finds that an increase in the iron precipitate and a decrease in degradation efficiency comes about as pH increases. An investigation into the Fe:L ratio shows that when a high amount of ligand is used, the amount of iron released from the complex is reduced; with an iron-ligand ratio of 1:1.5 being the most suitable one for the Fe3+ EDDS system. Furthermore, the result of careful examination of temperature changes shows that at the increase in temperature of the reaction system, there was a decrease in the efficiency of degradation of reaction. The process was more effective at a temperature of 25 degrees C than at higher temperatures, occasioned by higher iron precipitate. The results of the disinfection and regrowth of microorganisms also show that the efficiency of the process is pH-dependent with pH 7 having the best disinfection and less regrowth rate as compared to a pH value of 9, for instance. (AU)

• Processo FAPESP: 14/17774-1 - Influência da composição do efluente secundário na desinfecção por processos oxidativos avançados
• Beneficiário: Renato Falcão Dantas
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores