Coagulation and Microfiltration Application for Sugarcane Vinasse Clarification

Autor(es)

Sacchi, Gabriel Dibbern ^[1] ; Leite, Luan de Souza ^[1] ; Penalva Reali, Marco Antonio ^[1] ; Bichara, Andressa ^[1] ; Regali Seleghim, Mirna Helena ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Hydraul & Sanitat, Av Trabalhador Sao Carlense 400, BR-13566590 Sao Paulo, SP - Brazil

^[2] Fed Univ Sao Carlos UFSCar, Ctr Biol & Hlth Sci, Dept Ecol & Evolutionary Biol, Rod Washington Luiz, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: WATER AIR AND SOIL POLLUTION; v. 231, n. 12 DEC 3 2020.
• Citações Web of Science: 0

Resumo

Sugarcane vinasse, also known as distillery wastewater, is a key by-product of the ethanol industry. Vinasse characteristics and their huge volume pose environmental concerns about the choice of treatment method. Microfiltration (MF) has been efficiently applied to vinasse clarification; however, it has been underexplored in the literature. In this context, the present study investigated the application of coagulation and cross-flow MF for vinasse clarification. To maximize the process efficiency, operational parameters were optimized using the one-factor-at-a-time method in batch tests. The optimal values were Superfloc C492 concentration of 5 mg L-1, backpulsing frequency of 10 min, and vinasse temperature of 45 degrees C, which showed a removal of 35.0, 86.0, and 99.9% for chemical oxygen demand (COD), color, and turbidity, respectively. The optimization process significantly improved the vinasse flux but did not show any influence in the permeate quality. Optimal parameters were successfully applied to the continuous mode in the MF system, which operated during 164 h at an average flux of 21.6 L h(-1) m(-2). High removals were reached for color (79.3%) and turbidity (99.6%), and low removal was found for COD (31.6%), which are in agreement with the batch mode tests. This work showed the importance of operational optimization, and the results provide valuable support for establishing practical guidelines for vinasse clarification in the ethanol industry. (AU)

• Processo FAPESP: 11/07264-8 - Flotação por Ar Dissolvido aplicado à separação de microalgas cultivadas em fotobiorreator, alimentado com vinhaça pré-tratada físico-quimicamente, com vistas à produção de biodiesel
• Beneficiário: Gabriel Dibbern Sacchi
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 11/23891-2 - Flotação de microalgas cultivadas em fotobiorreatores alimentados com vinhaça pré-tratada por coagulação, floculação e sedimentação ou microfiltração, com vistas à produção de biodiesel
• Beneficiário: Marco Antonio Penalva Reali
• Modalidade de apoio: Auxílio à Pesquisa - Regular