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Coupled Inverse Fluidized Bed Bioreactor with Advanced Oxidation Processes for Treatment of Vinasse

  • Received: 26 June 2017 Accepted: 06 November 2017 Published: 13 November 2017
  • Vinasse is the wastewater generated from ethanol distillation; it is characterized by high levels of organic and inorganic matter, high exit temperature, dissolved salts and low pH. In this work the treatment of undiluted vinasse was achieved using sequentially-coupled biological and advanced oxidation processes. The initial characterization of vinasse showed a high Chemical Oxygen Demand (COD, 32 kg m-3), high Total Organic Carbon (TOC, 24.5 kg m-3) and low pH (2.5). The first stage of the biological treatment of the vinasse was carried out in an inverse fluidized bed bioreactor with a microbial consortium using polypropylene as support material. The fluidized bed bioreactor was kept at a constant temperature (37 ± 1ºC) and pH (6.0 ± 0.5) for 90 days. After the biological process, the vinasse was continuously fed to the photoreactor using a peristaltic pump 2.8 × 10-3 kg of FeSO4•7H2O were added to the vinasse and allowed to dissolve in the dark for five minutes; after this time, 15.3 m3 of hydrogen peroxide (H2O2) (30% w/w) were added, and subsequently, the UV radiation was allowed to reach the photoreactor to treat the effluent for 3600 s at pH = 3. Results showed that the maximum organic matter removed using the biological process, measured as COD, was 80% after 90 days. Additionally, 88% of COD removal was achieved using the photo-assisted Fenton oxidation. The overall COD removal after the sequentially-coupled processes reached a value as low as 0.194 kg m-3, achieving over 99% of COD removal as well as complete TOC removal.

    Citation: Karla E. Campos Díaz, José L. Álvarez Cruz, Miriam L. Lira Rodríguez, Erick R. Bandala. Coupled Inverse Fluidized Bed Bioreactor with Advanced Oxidation Processes for Treatment of Vinasse[J]. AIMS Geosciences, 2017, 3(4): 538-551. doi: 10.3934/geosci.2017.4.538

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  • Vinasse is the wastewater generated from ethanol distillation; it is characterized by high levels of organic and inorganic matter, high exit temperature, dissolved salts and low pH. In this work the treatment of undiluted vinasse was achieved using sequentially-coupled biological and advanced oxidation processes. The initial characterization of vinasse showed a high Chemical Oxygen Demand (COD, 32 kg m-3), high Total Organic Carbon (TOC, 24.5 kg m-3) and low pH (2.5). The first stage of the biological treatment of the vinasse was carried out in an inverse fluidized bed bioreactor with a microbial consortium using polypropylene as support material. The fluidized bed bioreactor was kept at a constant temperature (37 ± 1ºC) and pH (6.0 ± 0.5) for 90 days. After the biological process, the vinasse was continuously fed to the photoreactor using a peristaltic pump 2.8 × 10-3 kg of FeSO4•7H2O were added to the vinasse and allowed to dissolve in the dark for five minutes; after this time, 15.3 m3 of hydrogen peroxide (H2O2) (30% w/w) were added, and subsequently, the UV radiation was allowed to reach the photoreactor to treat the effluent for 3600 s at pH = 3. Results showed that the maximum organic matter removed using the biological process, measured as COD, was 80% after 90 days. Additionally, 88% of COD removal was achieved using the photo-assisted Fenton oxidation. The overall COD removal after the sequentially-coupled processes reached a value as low as 0.194 kg m-3, achieving over 99% of COD removal as well as complete TOC removal.


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