Biohydrogen production from dairy industry wastewater in an anaerobic fluidized-bed reactor
2019
Silva, Aline Neves da | Macêdo, Williane Vieira | Sakamoto, Isabel Kimiko | Pereyra, Daniela de Los Angeles Dalmao | Mendes, Camila Oliveira | Maintinguer, Sandra Imaculada | Caffaro Filho, Roberto Augusto | Damianovic, Marcia Helena Zamariolli | Varesche, Maria Bernadete Amancio | Amorim, Eduardo Lucena Cavalcante de
The present study evaluated the influence of organic loading rate in biohydrogen production from dairy wastewater in an anaerobic fluidized-bed reactor inoculated by natural fermentation of the wastewater used during the operational period. The support material for biomass adhesion was shredded tire. The reactor had a working volume of 908.4 cm³. Biohydrogen production was evaluated using three different organic loading rates (OLR) of 28.7 kgCOD m⁻³d⁻¹, 53.2 kgCOD m⁻³d⁻¹ e 101,7 kgCOD m⁻³d⁻¹ corresponding to the Hydraulic Retention Time (HRT) of 8 h (2.7 L d⁻¹), 6 h (3.6 L d⁻¹) and 4 h (5.4 L d⁻¹), respectively. The hydrogen yield decreased with increasing organic loading rate (OLR) from 2.56 ± 0.62 mol H₂ mol carbohydrate⁻¹ to 0.95 ± 0.28 mol H₂ mol carbohydrate⁻¹ as the OLR increased from 28.65 kgCOD m⁻³d⁻¹ to 95.76 kgCOD m⁻³d⁻¹. The hydrogen content in the biogas (volume of H₂/ volume of biogas) produced and the highest volumetric production were respectively 35.72 ± 9.43% and 0.80 ± 0.21 LH₂ h⁻¹ L⁻¹ obtained when the OLR was 53.25 ± 7.81 kgCOD m⁻³d⁻¹. The main metabolites produced were acetic acid (67.15%-87.42%) and ethanol (6.01%-13.09%). Increasing the applied OLR also caused an increase in bacterial diversity as evidenced by the highest value of the Shannon-Wiener index (2.811) corresponding to the operational phase of the highest OLR (95.76 ± 29.10 kgCOD m⁻³d⁻¹).
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