Ms S.I. Castro Lopes: "Sulfate reduction at low pH in organic wastewater"

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23 Oct 2007 13:30
Unit: Wageningen University
Location: Aula, building 362, Gen. Foulkesweg 1, Wageningen
Organisation: Wageningen University
Promotor: prof.dr.ir. C.J.N. Buisman (Biological Recycling Technology)
Co Promotor: Dr.ir. P.N.L. Lens, Dr. M.I. Capela (University of Aveiro, Portugal)

 This Ph.D. research explored the operational window of sulfate reduction at low pH (pH 6, 5 and 4) in organic wastewaters, with the aim of removing both sulfate and organic matter. High sulfate reduction efficiencies at low pH allow for a more sustainable operation of acidification reactors in a two-phase wastewater treatment system as no measures need to be taken to rise the pH in the acidification reactor. The low pH also facilitates the removal of sulfide by stripping. This research showed for the first time long-term sulfate reduction at pH as low as 4 during the acidification of a carbohydrate, at rates of technological interest. Sulfate reduction at low pH was shown to be very sensitive to sulfide, indicating that a sulfide removing step should be included in the design of acidification reactors in the case of high strength wastewaters and/or high sulfate concentrations.
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