Fate of H2S during the cultivation of Chlorella sp deployed for biogas upgrading
Por:
Gonzalez-Sanchez, Armando, Posten, Clemens
Publicada:
15 abr 2017
Resumen:
The H2S may play a key role in the sulfur cycle among the biogas
production by the anaerobic digestion of wastes and the biogas upgrading
by a microalgae based technology. The biogas is upgraded by contacting
with slightly alkaline aqueous microalgae culture, then CO2 and H2S are
absorbed. The dissolved H2S could limit or inhibit the microalgae
growth. This paper evaluated the role of dissolved H2S and other
sulfured byproducts under prevailing biogas upgrading conditions using a
microalgal technology. At initial stages of batch cultivation the growth
of Chlorella sp. was presumably inhibited by dissolved H2S. After 2
days, the sulfides were oxidized mainly by oxic chemical reactions to
sulfate, which was later rapidly assimilated by Chlorella sp., allowing
high growing rates. The fate of Has during the microalgae cultivation at
pH > 8.5 was assessed by a mathematical model where the pentasulfide,
thiosulfate and sulfite were firstly produced and converted finally to
sulfate for posterior assimilation. (C) 2017 Elsevier Ltd. All rights
reserved.
Filiaciones:
Gonzalez-Sanchez, Armando:
Karlsruhe Inst Technol, Sect Bioproc Engn 3, Inst Proc Engn Life Sci, Karlsruhe, Germany
Univ Nacl Autonoma Mexico, Inst Engn, Circuito Escolar, Ciudad Univ, Mexico City 04510, DF, Mexico
Posten, Clemens:
Karlsruhe Inst Technol, Sect Bioproc Engn 3, Inst Proc Engn Life Sci, Karlsruhe, Germany
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