Micro-oxygenation in upflow anaerobic sludge bed (UASB) reactors using a silicon membrane for sulfide oxidation

Freddy Valdés, Priscila Rosseto Camiloti, Jan Bartacek, Álvaro Torres-Aravena, JAVIERA BELEN TOLEDO ALARCON, Marcelo Zaiat, DAVID ALEJANDRO JEISON NUÑEZ

Research output: Contribution to journalArticlepeer-review

Abstract

Sulfide produced by sulphate-reducing bacteria in anaerobic reactors can seriously affect biogas quality. Microaeration has become a reliable way to remove sulfide, by promoting its oxidation. However, limited research is available regarding its application in upflow anaerobic sludge bed (UASB) reactors. In this research, silicon membranes were studied as a mechanism to dose oxygen in USAB reactors. Two configurations were tested: the membrane placed inside the reactor or in an external module. Our results show that the external membrane proved to be a more practical alternative, providing conditions for sulfide oxidation. This led to a reduction in its concentration in the liquid effluent and biogas. External membrane configuration achieved a sulfide conversion rate of 2.4 g-S m2 d−1 . Since the membrane was not sulfide-selective, methane losses were observed (about 9%). In addition, excessive oxygen consumption was observed, compared to the stoichiometric requirement. As is the case for many membrane-based systems, membrane area is a key factor determining the correct operation of the system.

Original languageEnglish
Article number1990
Pages (from-to)1-11
Number of pages11
JournalPolymers
Volume12
Issue number9
DOIs
StatePublished - Sep 2020
Externally publishedYes

Keywords

  • Membrane
  • Oxidation
  • Oxygen
  • Sulfide
  • UASB

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