Biorreator com membranas anaeróbio de duplo estágio para o tratamento do vinhoto

• Ano de defesa: 2012
• Autor(a) principal: Vera Tainá Franco Vidal Mota
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Meio Ambiente e Recursos Hídricos; Saneamento; Biorreatores; Meio ambiente; Engenharia sanitária; Vinhaça
• Link de acesso: http://hdl.handle.net/1843/ENGD-92JPNM

This study evaluated the treatment of sugarcane vinasse in a two-stage anaerobic membrane bioreactor (AnMBR). For a better comprehension of the effluent characteristics and its behavior during biological degradation, this research initially undertook a detailed characterization of vinasse and its aerobic and anaerobic biodegradability. Afterward it was studied the treatment of vinasse in a system comprised of an upflow acidogenic reactor followed by a methanogenic reactor coupled to a membrane module. The vinasse samples differed greatly among themselves; however, the parameters present in the soluble fraction, in general, showed little variability. Vinasse samples showed an excellent biodegradability (>96.5%) and low percentage of inert COD (<3.5%) in both aerobic and anaerobic conditions. During acclimatization, priority was given to maintaining safe levels of VFA and bicarbonate alkalinity in the methanogenic reactor. After acclimatization period, the averageconcentrations of VFA in the raw effluent, in effluent from acidogenic reactor and in permeate were 2141, 3525 and 72 mg.L-1 (as acetic acid), respectively. The separation of the stages was also verified by biogas composition. In the biogas of the acidogenic reactor, methane concentration was negligible, whereas the biogas from the methanogenic reactor consisted of approximately 64% methane and 36% carbon dioxide. Color and turbidity removal was 57.4 ± 15.4% and 97.2 ± 2.0% respectively. The AnMBR showed satisfactory results in removal of organic matter. The overall removal of COD and TOC was 96.9 ± 0.7%and 95.0 ± 1.1% respectively. Regarding filtration performance it was found that cake layer formation showed to be the limiting factor determining the operational permeability. The results showed that the treated effluent in the two-stage AnMBR showed a very high qualitycompared to raw vinasse for use as fertilizer in agriculture low content of biodegradable organic matter, free of suspended solids, neutral pH and less prone to acidification. Furthermore it may be evaluated the possibility of applying a post-treatment for recovery of inorganic nutrients. It is recommended future researches towards optimize the filtration conditions in order to increase the viability of the process.