Biogenic sulfides for sequestration of Cr (VI), COD and sulfate from synthetic wastewater

  • Verma A
  • Dua R
  • Singh A
  • et al.
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Abstract

The aim of this work is to explore the possibility of using mixed culture of mesophilic sulfate-reducing bacteria (SRB) for retrieval of toxic and carcinogenic Cr (VI) from synthetic solution. In order to treat Cr (VI) containing wastewater effectively, SRB culture was adapted to 50mg/L Cr (VI) and maintained through repeated sub-culturing to enhance the growth and activity of SRB. Batch biosorption experiments were carried out in glass serum vials by cultured SRB, accomplishing the removal of 82.1% Cr (VI), 76.9% sulfate, 85.7% COD under the following optimized conditions: pH 7, hydraulic retention time (HRT) 7 days, temperature 37°C and initial Cr (VI) concentration of 50mg/L. Further sorption experiments were conducted on synthetic wastewater under optimal operational conditions and resulted in 89.2% Cr (VI), 81.9% COD and 95.3% sulfate reduction from simulated wastewater. The results of this work contributed to a better understanding of metal uptake by biogenic sulfides and would be beneficial in the development of potential biosorbents that possess high capacities for Cr (VI) uptake from aqueous environments.

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Verma, A., Dua, R., Singh, A., & Bishnoi, N. R. (2015). Biogenic sulfides for sequestration of Cr (VI), COD and sulfate from synthetic wastewater. Water Science, 29(1), 19–25. https://doi.org/10.1016/j.wsj.2015.03.001

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