PRODUÇÃO DE BIOGÁS A PARTIR DE VINHAÇA DE ETANOL DE SEGUNDA GERAÇÃO

• DOI: 10.22533/at.ed.25019031214

• Palavras-chave: Atena

• Keywords: biogas; anaerobic digestion; second generation vinasse; lignocellulosic ethanol; effluent recirculation

• Abstract:

  Anaerobic digestion has raised

  as an efficient solution for both biowastes

  management and renewable energy supply. In

  Brazil, the sucroenergetic industry generates

  great amounts of vinasse, the biowaste from

  ethanol process, which has high contents of

  soluble organic matter. Such feature makes

  vinasse a very suitable wastewater for biogas

  production. Very recently, second generation

  (2G) ethanol process has been implemented in

  the Brazilian industry and 2G vinasse is expected

  to a different chemical composition than first

  generation (1G) vinasse, since the 2G ethanol

  process has different operations. In this study

  we aimed to investigate the 2G vinasse potential

  for biogas production. Affluent 2G vinasse

  was characterized and high concentrations of

  acetic acid, total phenolic compounds (TPC)

  and sulphate were determined. No detectable

  concentration of furans was found. The

  experiment was carried out in a 5 L up flow

  reactor and the process was monitored by

  volumetric biogas production and concentration

  of Chemical Oxygen Demand, acetic acid,

  propionic acid, butyric acid, TPC and sulphate.

  Effluent recirculation was employed in the

  process for a ten days period. The experiment

  reached a mean value for biogas production

  of 0.41 (± 0.19) Lbiogas DQOremov

  -1, which is a

  satisfactory result in comparison to previous

  had a positive impact on biogas production process, which was observed by organic

  acids concentrations decrease. Results indicate that 2G vinasse has a very interesting

  potential for biogas production especially due to its high acetic acid content.

• Número de páginas: 15