Acidogenesis is a key step in the anaerobic biotransformation of organic micropollutants

Autor(es)

Carneiro, Rodrigo B. ^{[1, 2]} ; Gonzalez-Gil, Lorena ^[1] ; Andrea Londono, Yudy ^[3] ; Zaiat, Marcelo ^[2] ; Carballa, Marta ^[1] ; Lema, Juan M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Santiago Compostela, Sch Engn, Dept Chem Engn, Rua Lope Gomez de Marzoa, E-15782 Santiago De Compostela - Spain

^[2] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Hydraul & Sanitat, Biol Proc Lab LPB, 1100 Joao Dagnone Ave, BR-13563120 Sao Carlos, SP - Brazil

^[3] Univ Antioquia, Univ Res Headquarters SIU, Fac Engn, St 70 52-21, Medellin - Colombia

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF HAZARDOUS MATERIALS; v. 389, MAY 5 2020.
• Citações Web of Science: 0

Resumo

Understanding the role of the different anaerobic digestion stages on the removal of organic micropollutants (OMPs) is essential to mitigate their release from wastewater treatment plants. This study assessed the fate of 21 OMPs during hydrolysis and acidogenesis to elucidate the contribution of these stages to the overall anaerobic removal. Moreover, the removal mechanisms and factors influencing them were investigated. To this purpose, a fermentation reactor was operated and fed with two different substrates: starch (to jointly evaluate hydrolysis and acidogenesis) and glucose (to isolate acidogenesis). Results indicate that sulfamethoxazole was highly biotransformed (> 80 %), while galaxolide, celestolide, tonalide, erythromycin, roxithromycin, trimethoprim, octylphenol and nonylphenol achieved a 50-80 % biotransformation. Since no significant differences in the biotransformation efficiencies were found between starch and glucose fermentation, it is stated that the enzymatic activities involved in starch hydrolysis do not significantly contribute to the cometabolic biotransformation of OMPs, while acidogenesis appears as the major player. Moreover, a higher biotransformation (>= 15 percentage points and p <= 0.05) was found for galaxolide, celestolide, tonalide, erythromycin and roxithromycin during acidogenesis in comparison with the efficiencies reported for the acetogenic/methanogenic step. The biotransformation of some OMPs was explained considering their chemical structure and the enzymatic activities. (AU)

• Processo FAPESP: 17/13066-0 - Influência da atividade hidrolítica e acidogênica na biotransformação anaeróbia de micropoluentes orgânicos
• Beneficiário: Rodrigo Braz Carneiro
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado