High rate sulfate reduction at pH 6 in a Ph-auxostat submerged membrane bioreactor fed with formate

M.F.M. Bijmans, T.W.T. Peeters, P.N.L. Lens, C.J.N. Buisman

Research output: Contribution to journalArticleAcademicpeer-review

25 Citations (Scopus)

Abstract

Many industrial waste and process waters contain high concentrations of sulfate, which can be removed by sulfate-reducing bacteria (SRB). This paper reports on mesophilic (30 °C) sulfate reduction at pH 6 with formate as electron donor in a membrane bioreactor with a pH-auxostat dosing system. A mixed microbial community from full-scale industrial wastewater treatment bioreactors operated at pH 7 was used as inoculum. The pH-auxostat enabled the bacteria to convert sulfate at a volumetric activity of 302 mmol sulfate reduced per liter per day and a specific activity of 110 mmol sulfate reduced per gram volatile suspended solids per day. Biomass grew in 15 days from 0.2 to 4 g volatile suspended solids per liter. This study shows that it is possible to reduce sulfate at pH 6 with formate as electron donor at a high volumetric and specific activity with inocula from full-scale industrial wastewater treatment bioreactors operated at neutral pH. The combination of a membrane bioreactor and a pH-auxostat is a useful research tool to study processes with unknown growth rates at maximum activities.
Original languageEnglish
Pages (from-to)2439-2448
JournalWater Research
Volume42
Issue number10-11
DOIs
Publication statusPublished - 2008

Keywords

  • waste water treatment
  • industrial wastes
  • bioreactors
  • membranes
  • filtration
  • sulfate reducing bacteria
  • sulfate reduction
  • gas-lift reactor
  • reducing bacteria
  • hydrogen-sulfide
  • carbon-dioxide
  • growth
  • methanogenesis
  • conversion
  • removal
  • sludge
  • water

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