Estudo cinético da biodegradação de triclosan em efluente sintético utilizando carvão ativado como suporte em reator batelada

Abstract

In this work, the removal of Triclosan in aqueous solution was evaluated by applying a system containing biofilm in a batch reactor. The support used was coconut shell activated carbon with a particle size of 8-12 mesh. The concentrations of Triclosan evaluated were: 5.62 ± 0.01, 9.34 ± 0.66, and 14.37 ± 0.88 mg L-1, with initial pH in the range 6.7 - 7.07 and stirring speed of 150 rpm. The results showed that the amount of biomass adhered to the support was 8.29 mg gsuport-1, reaching 100% removal of Triclosan in 100 min of contact time for the concentration of 14.37 ± 0.88 mg L-1 and 45 min for the other concentrations studied. Regarding the kinetic parameters obtained through the Michaelis-Menten kinetic model, the value of the half saturation constant relative to Triclosan (KA) indicated a higher affinity for the effluent at higher concentration. The degradation rate (avRma), was higher for the lower concentrations. The results indicate that the process of biodegradation of Triclosan in aqueous solution using activated carbon as biomass support is possible and can be applied for effluents containing this emerging contaminant. Keywords: Effluent; Emerging Contaminants; Bioreactor; Michalis-Menten Kinetics.