Sulfur formation and recovery in a thiosulfate-oxidizing bioreactor

Environmental Technology
Armando González-SánchezSergio Revah

Abstract

This work describes the design and performance of a thiosulfate-oxidizing bioreactor that allowed high elemental sulfur production and recovery efficiency. The reactor system, referred to as a Supernatant-Recycling Settler Bioreactor (SRSB), consisted of a cylindrical upflow reactor and a separate aeration vessel. The reactor was equipped with an internal settler and packing material (structured corrugated PVC sheets) to facilitate both cell retention and the settling of the formed elemental sulfur. The supernatant from the reactor was continuously recirculated through the aerator. An inlet thiosulfate concentration of 100 mmol l(-1) was used. The reactor system was fed with 89 mmol l(-1) d(-1) thiosulfate reaching 98 to 100% thiosulfate conversion with an elemental sulfur yield of 77%. Ninety-three percent of the produced sulfur was harvested from the bottom of the reactor as sulfur sludge. The dry sulfur sludge contained 87% elemental sulfur. The inclusion of an internal settler and packing material in the reactor system resulted in an effective retention of sulfur and biomass inside the bioreactor, preventing the oxidation of thiosulfate and elemental sulfur to sulfate in the aerator and, therefore, improving the efficiency ...Continue Reading

References

Jul 22, 2005·Letters in Applied Microbiology·A González-SánchezS Revah
Apr 1, 1987·Biotechnology and Bioengineering·K L Subletta
Mar 15, 1991·Biotechnology and Bioengineering·C OngcharitY T Shah
Oct 20, 1991·Biotechnology and Bioengineering·C J BuismanG Lettinga
Aug 5, 1995·Biotechnology and Bioengineering·A J JanssenG Lettinga
Jan 5, 1997·Biotechnology and Bioengineering·A J JanssenG Lettinga

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Citations

Apr 25, 2013·Environmental Science & Technology·Kris M HartBrian P Kelleher
Jan 23, 2020·Environmental Science and Pollution Research International·Tejaswini EregowdaPiet N L Lens
Oct 8, 2021·Environmental Technology·Réka Hajdu-RahkamaJaakko A Puhakka

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Methods Mentioned

BETA
electrophoresis

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