Sulfate reduction during the acidification of sucrose at pH 5 under thermophilic (55 degrees C) conditions. II: Effect of sulfide and COD/SO42- ratio

S.I.C. Lopes, M.I. Capela, P.N.L. Lens

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24 Citations (Scopus)

Abstract

This work studied the effect of the sulfide concentration and COD/SO42- ratios (4 and 1) on sulfate reduction and acidification in a thermophilic (55 degrees C) UASB reactor fed with sucrose (4 g COD (I-reactor d)(-1)) operated at a reactor mixed liquor pH controlled at 5 for a period of 301 days. When implementing N-2 stripping, sulfate reduction efficiencies up to 95%, corresponding to volumetric sulfate reduction rates of 0.87 and 4.2 g (I-reactor d)(-1) at the COD/SO42- ratios of 4 and 1, respectively, were achieved. Sulfide was toxic to sulfate reduction at a total dissolved sulfide concentration of 100 mg l(-1). Acidification was always complete and acetate was the only form of substrate in the effluent at a COD/SO42- ratio of 1. The sludge was well retained in the reactor and kept its granular shape throughout the reactor run.
Original languageEnglish
Pages (from-to)4278-4284
JournalBioresource Technology
Volume101
Issue number12
DOIs
Publication statusPublished - 2010

Keywords

  • granular sludge reactors
  • anaerobic-digestion
  • reducing bacteria
  • acidogenic phase
  • waste-water
  • toxicity
  • systems
  • degradation
  • performance
  • propionate

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