Treatment of real flue gas desulfurization wastewater in an autotrophic biocathode in view of elemental sulfur recovery: Microbial communities involved

Research output: Contribution to journalArticleResearch

12 Citations (Scopus)

Abstract

© 2018 Elsevier B.V. Sulfur oxide emissions can lead to acidic precipitation and health concerns. Flue gas desulfurization (FGD) systems treat these emissions generating a wastewater with high-sulfate content. This work is the first attempt to treat this effluent with bioelectrochemical systems (BES) in order to recover elemental sulfur, a technology that allows the treatment of several wastewaters that lack of electron donor. The sulfate treatment and elemental sulfur recovery have been studied in a biocathode with simultaneous sulfate reduction to sulfide and partial sulfide oxidation, comparing the performance obtained with synthetic and real wastewater. A decrease of the sulfate removal rate (SRR) from 108 to 73 mg S-SO 42− L −1 d −1 was observed coupled to an increase in the elemental sulfur recovery from 1.4 to 27 mg S-S 0 L −1 d −1 . This elemental sulfur recovered as a solid from the real wastewater represented a 64% of the theoretical elemental sulfur produced (the elemental sulfur corresponded to a 72% of the solid weight). In addition, microbial communities analysis of the membrane and cathode biofilms and planktonic biomass showed that the real wastewater allowed a higher growth of sulfur oxidizing bacteria (SOB) adapted to more complex waters as Halothiobacillus sp. while decreasing the relative abundance of sulfate reducing bacteria (SRB).
Original languageEnglish
Pages (from-to)945-952
Number of pages8
JournalScience of the Total Environment
Volume657
DOIs
Publication statusPublished - 20 Mar 2019

Keywords

  • Biocathode
  • Bioelectrochemical system (BES)
  • Sulfate-reducing bacteria (SRB)
  • Sulfide-oxidizing bacteria (SOB)
  • Sulfur
  • Sulfur/isolation & purification
  • Chemical Industry
  • Desulfovibrio/physiology
  • Sulfates/chemistry
  • Autotrophic Processes
  • Electrochemical Techniques/instrumentation
  • Electrodes/microbiology
  • Waste Disposal, Fluid/methods
  • Microbial Consortia/physiology
  • SYSTEM
  • BIOTRICKLING FILTER
  • DIOXIDE
  • SULFIDE REMOVAL
  • SP NOV.
  • SEWAGE
  • HYDROGEN
  • PH
  • SULFATE REDUCTION
  • CO-TREATMENT

Fingerprint Dive into the research topics of 'Treatment of real flue gas desulfurization wastewater in an autotrophic biocathode in view of elemental sulfur recovery: Microbial communities involved'. Together they form a unique fingerprint.

Cite this