Vinasse degradation using Pleurotus sajor-caju in a combined biological – Electrochemical oxidation treatment

• Published in: Separation and purification technology Vol. 192; pp. 287 - 296
• Main Authors: Vilar, Débora S., Carvalho, Giovana O., Pupo, Marília M.S., Aguiar, Mario M., Torres, Nádia H., Américo, Juliana H.P., Cavalcanti, Eliane B., Eguiluz, Katlin I.B., Salazar-Banda, Giancarlo R., Leite, Manuela S., Ferreira, Luiz F.R.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 09-02-2018
• Subjects: AOP’s; Biodegradation; Combined treatment; Toxicity; Vinasse; Biodegradation; AOP’s; Combined treatment; Toxicity; Vinasse
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2017.10.017

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•Pleurotus sajor-caju showed high degradation potential of vinasse.•Electrochemical oxidation improved the efficiency of biological treatment.•The toxicity of vinasse with biological and combined treatment was reduced.•The combined treatment was efficient in vinasse degradation.
Industrial wastewater treatment, by combined processes, has recently been seen as a novel and economically attractive strategy. The use of Pleurotus sajor-caju, followed by electrochemical oxidation (EO) for sugarcane vinasse degradation was investigated. Vinasse degradation treatment with P. sajor-caju yielded efficient color removal (97%), turbidity (99%), chemical oxygen demand (COD) (50.6%), and total organic carbon (TOC) (57.3%). Ligninolytic enzyme production was seen, and the highest laccase activity were obtained after 12th day of fermentation (varying between 341–400UIL–1) and for peroxidase manganese the highest activity was seen between the 9th and 12th day of fermentation (varying between 1400–1494UIL–1). Concomitantly, the mycelial biomass presented a high concentration (13.63gL–1) on the 15th day of growth. In optimized conditions, the EO using as anode Ti/(RuO2)0.7(IrO2)0.1(Sb2O3)0.2 further degraded vinasse, reaching a final color removal of 100%, COD of 66% and TOC of 61%. This additional procedure allowed the elimination of vinasse toxicity reaching 0% lethality for Lactuca sativa and Raphidocelis subcapitata.