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Evaluation of UASB reactor performance during start-up operation using Cuban vinasse as a sulfate rich liquid substrate

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Abstract
Vinasse obtained after the distillation of fermented cane molasses to produce ethanol, is a liquid waste that is very suitable for anaerobic digestion. This is considered a sulfate-rich liquid substrate, from which high levels of hydrogen sulfide in the liquid and gas phases can be obtained due to the sulfate reduction process under anaerobic conditions. This research was focused on the evaluation of a UASB reactor performance during start-up operation using Cuban vinasse as a sulfate rich liquid substrate, with emphasis on sulfate and sulfide concentration profiles. The Influent, three sample ports in the settler zone, the effluent and the gas phase were monitored during 4 phases of the start-up period. The results showed homogenous distribution of the COD and sulfate concentrations in the settler zone, while dissolved and free sulfide concentrations decreased due to mass transfers of hydrogen sulfide to the gas phase. It was concluded that the sludge present in the UASB reactor was becoming more active when the organic and sulfur loading rates increased. In addition, UASB reactors treating sulfate rich liquid substrates are exposed to higher free hydrogen sulfide concentrations in the first 40 % of the reactor working volume. It was confirmed that free hydrogen sulfide concentrations are below inhibition limits (50 mg S l-1) for COD/SO42- ratios above 10 (30-36 in the present study).
Keywords
Start-up, Sulfide profile, Vinasse, UASB reactor

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MLA
Barrera Cardoso, Ernesto Luis, Henri Spanjers, Jo Dewulf, et al. “Evaluation of UASB Reactor Performance During Start-up Operation Using Cuban Vinasse as a Sulfate Rich Liquid Substrate.” Anaerobic Digestion, 13th World Congress, Papers. 2013. Print.
APA
Barrera Cardoso, E. L., Spanjers, H., Dewulf, J., Romero, O., & Rosa, E. (2013). Evaluation of UASB reactor performance during start-up operation using Cuban vinasse as a sulfate rich liquid substrate. Anaerobic Digestion, 13th World congress, Papers. Presented at the 13th World congress on Anaerobic Digestion (AD-13).
Chicago author-date
Barrera Cardoso, Ernesto Luis, Henri Spanjers, Jo Dewulf, Osvaldo Romero, and Elena Rosa. 2013. “Evaluation of UASB Reactor Performance During Start-up Operation Using Cuban Vinasse as a Sulfate Rich Liquid Substrate.” In Anaerobic Digestion, 13th World Congress, Papers.
Chicago author-date (all authors)
Barrera Cardoso, Ernesto Luis, Henri Spanjers, Jo Dewulf, Osvaldo Romero, and Elena Rosa. 2013. “Evaluation of UASB Reactor Performance During Start-up Operation Using Cuban Vinasse as a Sulfate Rich Liquid Substrate.” In Anaerobic Digestion, 13th World Congress, Papers.
Vancouver
1.
Barrera Cardoso EL, Spanjers H, Dewulf J, Romero O, Rosa E. Evaluation of UASB reactor performance during start-up operation using Cuban vinasse as a sulfate rich liquid substrate. Anaerobic Digestion, 13th World congress, Papers. 2013.
IEEE
[1]
E. L. Barrera Cardoso, H. Spanjers, J. Dewulf, O. Romero, and E. Rosa, “Evaluation of UASB reactor performance during start-up operation using Cuban vinasse as a sulfate rich liquid substrate,” in Anaerobic Digestion, 13th World congress, Papers, Santiago de Compostela, Spain, 2013.
@inproceedings{5843169,
  abstract     = {Vinasse obtained after the distillation of fermented cane molasses to produce ethanol, is a liquid waste that is very suitable for anaerobic digestion. This is considered a sulfate-rich liquid substrate, from which high levels of hydrogen sulfide in the liquid and gas phases can be obtained due to the sulfate reduction process under anaerobic conditions. This research was focused on the evaluation of a UASB reactor performance during start-up operation using Cuban vinasse as a sulfate rich liquid substrate, with emphasis on sulfate and sulfide concentration profiles. The Influent, three sample ports in the settler zone, the effluent and the gas phase were monitored during 4 phases of the start-up period. The results showed homogenous distribution of the COD and sulfate concentrations in the settler zone, while dissolved and free sulfide concentrations decreased due to mass transfers of hydrogen sulfide to the gas phase. It was concluded that the sludge present in the UASB reactor was becoming more active when the organic and sulfur loading rates increased. In addition, UASB reactors treating sulfate rich liquid substrates are exposed to higher free hydrogen sulfide concentrations in the first 40 % of the reactor working volume. It was confirmed that free hydrogen sulfide concentrations are below inhibition limits (50 mg S l-1) for COD/SO42- ratios above 10 (30-36 in the present study).},
  author       = {Barrera Cardoso, Ernesto Luis and Spanjers, Henri and Dewulf, Jo and Romero, Osvaldo and Rosa, Elena},
  booktitle    = {Anaerobic Digestion, 13th World congress, Papers},
  keywords     = {Start-up,Sulfide profile,Vinasse,UASB reactor},
  language     = {eng},
  location     = {Santiago de Compostela, Spain},
  pages        = {4},
  title        = {Evaluation of UASB reactor performance during start-up operation using Cuban vinasse as a sulfate rich liquid substrate},
  year         = {2013},
}