Abstract
This study evaluated the influence of the applied volumetric organic load on biohydrogen production in an anaerobic sequencing batch biofilm reactor (AnSBBR) with 3.5 L of liquid medium and treating 1.5 L of glycerin-based wastewater per cycle at 30 °C. Six applied volumetric organic loads (AVOLCT) were generated from the combination of cycle periods (3 and 4 h) and influent concentrations (3000, 4000, and 5000 mg chemical oxygen demand (COD) L−1), with values ranging from 7565 to 16,216 mg COD L−1 day−1. No clear relationship was found between the applied volumetric organic load and the hydrogen production. However, the highest hydrogen molar production (MPr 67.5 mol H2 m−3 day−1) was reached when the reactor was operated with a cycle period of 4 h and an influent concentration of 5000 mg COD L−1 (AVOLCT 12,911 mg COD L−1 day−1). This condition also reached the highest molar yield per applied load based on the organic matter (MYALC,m 21.1 mol H2 kg COD−1). In addition, the pretreatment of the sludge/inoculum was found to not influence the productivity/yield of the process, and the use of crude glycerol as a sole source of carbon exhibited a clear disadvantage for hydrogen production compared to pure glycerol. The AnSBBR used for the hydrogen production experiments operated with pure glycerol as a sole carbon source exhibited important practical potential.
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Abbreviations
- ASOLCT :
-
Applied specific organic load based on organic matter (kg COD m−3 day−1)
- AVOLCT :
-
Applied volumetric organic load based on organic matter (kg COD m−3 day−1)
- C CF :
-
Concentration based on organic matter for filtered samples in the effluent (mg COD L−1)
- C CT :
-
Concentration based on organic matter for unfiltered samples in the effluent (mg COD L−1)
- C CT,I :
-
Concentration based on organic matter for unfiltered samples in the influent (mg COD L−1)
- C H2 :
-
Molar concentration (not quantity) of hydrogen at normal conditions of temperature and pressure (mmol-NCTP L-1)
- C CH4 :
-
Molar concentration (not quantity) of methane at normal conditions of temperature and pressure (mmol-NCTP L-1)
- C X :
-
Concentration of biomass in the reactor in total volatile solids per volume of liquid (g TVS L−1)
- C′X :
-
Concentration of biomass in the reactor in total volatile solids per mass of support (g TVS g support−1)
- M TVS :
-
Total biomass in the reactor in total volatile solids (g TVS)
- MPr:
-
Daily molar productivity of hydrogen (mol H2 m−3 day−1)
- MYALC,m :
-
Molar yield per applied load based on organic matter expressed in kilograms (mol H2 kg COD−1)
- MYRLC,m :
-
Molar yield per removed load based on organic matter expressed in kilograms (mol H2 kg COD−1)
- N :
-
Number of cycles per day (cycle day−1)
- n H2 :
-
Daily molar production of hydrogen (mol day−1)
- RSOLCF :
-
Removed volumetric specific load based on organic matter (kg COD g TVS−1 day−1)
- RVOLCF :
-
Removed specific organic load based on organic matter (kg COD m−3 day−1)
- SB:
-
Sodium bicarbonate
- SS:
-
Solutions of the salts specified in “Wastewater”
- SMPr:
-
Daily specific molar productivity of hydrogen (mol H2 kg TVS−1 day−1)
- t C :
-
Cycle time (h cycle−1)
- TA:
-
Total alkalinity (mg CaCO3 L−1)
- TS:
-
Total solids concentration (mg L−1)
- TSS:
-
Total suspended solids concentration (mg L−1)
- TVA:
-
Total volatile acids (mg HAc L−1)
- TVS:
-
Total volatile solids concentration (mg L−1)
- VSS:
-
Volatile suspended solids concentration (mg L−1)
- V F :
-
Volume of wastewater fed during the cycle (L cycle−1)
- V H2 :
-
Daily volumetric production of hydrogen (mol day−1)
- V R :
-
Volume of liquid medium in the reactor (L)
- V G :
-
Normal volume of biogas (H2, CO2, and CH4) produced along a cycle (NmL cycle−1)
- ε CF :
-
Removal efficiency based on organic matter for filtered samples (%)
- ε CT :
-
Removal efficiency based on organic matter for unfiltered samples (%)
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Acknowledgments
This study was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, Brazil, 2009/15.984-0), the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil), and the Coordenação de Aperfeiçoamento de Pessoal do Ensino Superior (CAPES, Brazil).
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Bravo, I.S.M., Lovato, G., Rodrigues, J.A.D. et al. Biohydrogen Production in an AnSBBR Treating Glycerin-Based Wastewater: Effects of Organic Loading, Influent Concentration, and Cycle Time. Appl Biochem Biotechnol 175, 1892–1914 (2015). https://doi.org/10.1007/s12010-014-1421-1
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DOI: https://doi.org/10.1007/s12010-014-1421-1