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

1 ESIQIE, Instituto Politécnico Nacional. U.P. Adolfo López Mateos, C.P. 07738, México.
2 Facultad de Ingeniería, UNAM-DEPFI, C.P. 62550, Morelos, México.
3 Division of Hydrologic Sciences. Desert Research Institute. 755, Las Vegas, NV, USA.

Special Issues: Water for an increasing population in a changing climate

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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Keywords vinasse treatment; fluidized bed bioreactor; advanced oxidation process; Chemical Oxygen Demand; ethanol distillation

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. AIMS Geosciences, 2017, 3(4): 538-551. doi: 10.3934/geosci.2017.4.538


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