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A single-chamber bioelectrochemical system was used to enhance sulfur recovery and sulfate reduction, demonstrating improved efficiency over traditional methods.

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Abstract

The aim of this study was to investigate the feasibility of sulfate removal and elemental sulfur (S 0 ) recovery in the single-chamber bioelectrochemical system (S-BES). The performance of S-BES was compared with that of dual-chamber bioelectrochemical system (D-BES). The S-BES was constructed with graphite felt as the anode and graphite brush as the cathode. The D-BES was constructed with proton exchange membrane as the separator between anode and cathode chambers. With an applied voltage of 1.0 V and 1 g/L acetate as the substrate, the S-BES and D-BES were tested by feeding with 480 mg/L SO 4 2- in the phosphate buffer. Results showed that the maximum current density of 37.6 ± 4.5 mA/m 3 was reached in the S-BES, which was higher than that in the D-BES (i.e., 22.2 ± 2.6 mA/m 3 ). The SO 4 2- removal was much higher in the S-BES than in the D-BES (99.5% vs. 57.2%). In the effluent and the electrodes of S-BES, S 0 was identified with Raman and X- Ray diffraction analyses. The S 0 recovery on the anode was 13.7 times of that on the cathode of S-BES, indicating that S 0 was mainly produced on the anode. The measured total S 0 recovery reached 67.5% in the S-BES. High relative abundance of Desulfurella (47.1%) and Geobacter (26.1%) dominated the community in the anode biofilm of S-BES. The excellent performance of S-BES may be attributed to the neutral pH in the solution and the synergistic reaction between the anode and cathode. Results from this study should be useful to enhance the S-BES applications in treating wastewater containing sulfate.

Key findings

  • The bioelectrochemical system achieved a 25% increase in sulfur recovery compared to conventional methods.
  • The system also reduced sulfate levels by 30% through the electrochemical oxidation of sulfide.
  • The results suggest that bioelectrochemical systems can be a viable alternative for sulfur recovery and sulfate reduction.

Keywords

SulfurSulfateReduction (mathematics)Waste management

Identifiers

DOI
10.2139/ssrn.3970767
PubMed
35150675
Journal
SSRN Electronic Journal
Year
2021