Evaluation of the influence of trace metals on methane production from domestic sewage, using the Plackett-Burman experimental design

Autor(es)

da Silva, Julliana Alves ^[1] ; Braga, Adriana F. M. ^[2] ; Fermoso, Fernando G. ^[3] ; Zaiat, Marcelo ^[2] ; Silva, Gustavo H. R. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Dept Civil & Environm Engn, Av Engenheiro Luiz Edmundo Carrijo Coube 14-01, BR-17033360 Bauru, SP - Brazil

^[2] Univ Sao Paulo, Ctr Res Dev & Innovat Environm Engn, Sao Carlos Sch Engn EESC, Biol Proc Lab, Engn Ambiental Bloco 4-F, Av Joao Dagnone 1100, BR-13563120 Sao Carlos, SP - Brazil

^[3] CSIC, Inst Grasa, Campus Univ Pablo de Olavide, Edificio 46, Seville 41013 - Spain

• Tipo de documento: Artigo Científico
• Fonte: Journal of Environmental Management; v. 294, SEP 15 2021.
• Citações Web of Science: 0

Resumo

Methanogenesis involves several enzymes with trace metal components that catalyze major metabolic pathways and, therefore, requires a sufficient supply of micronutrients such as iron, nickel or cobalt. The statistically-based Plackett-Burman experimental design was adopted in this study to identify which trace metal have a statistically significant effect on the maximum methane production from domestic sewage. The addition of Barium (Ba), Cobalt (Co), Copper (Cu), Iron (Fe), Manganese (Mn), Nickel (Ni) and Selenium (Se) was tested in batch reactors using domestic sewage as the substrate and sewage sludge as the inoculum. The results showed that the addition of Fe was statistically significant, positively affecting the maximum CH4 production (p-value 0.05). The results are expressed in L of CH4 per g of Chemical Oxygen Demand added, increasing it from 0.10 to 0.13 LCH4 gCODadd -1 . In L of CH4 per g of Volatile Solids, increased it from 0.031 to 0.040 LCH4 gVS-1. The addition of Se was statistically significant, but with a negative effect on the maximum methane production (p-value 0.002), which decreased from 0.13 to 0.10 LCH4.gCODadd- 1 . Moreover, six different Fe concentrations (0, 40, 80, 120, 160 and 200 mgL-1) were tested, showing that the addition of 120 mgL-1 had the greatest effect for statistically improving the maximum methane production, with 33% improvement (0.12 +/- 0.003 to 0.16 +/- 0.012 LCH4 gCODadd - 1 ) compared to no addition of Fe and the specific CH4 production to 0.040 +/- 0.001 LCH4 gVS-1. (AU)

• Processo FAPESP: 18/00213-8 - Dinâmica de metais traço na digestão anaeróbia de vinhaça: Efeito da suplementação de Ba
• Beneficiário: Adriana Ferreira Maluf Braga
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/18367-1 - Microalgas como solução para recuperação de nutrientes provenientes de esgoto sanitário de alta carga
• Beneficiário: Gustavo Henrique Ribeiro da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular