Enhancement of Sulfide production by a consotium of Sulfate reducing bacteria cultivated from the lead-contaminated wastewater

  • Nguyễn Thị Yên
  • Đặng Thị Yến
  • Vương Thị Nga
  • Nguyễn Thanh Bình
  • Kiều Thị Quỳnh Hoa

Abstract

Heavy metal-contaminated wastewater from mining and industry processing negatively impacts to living orgamisms as well as humans. Envừonmental-ôiendly and cost effectivenesi process based on biological sulfide production by sulfate-reducing bacteria (SRB) have become an alternative for the removal of heavy metals. Bio-treatment of heavy metal-contaminated waters by sulfate-reducing bacteria (SRB) sữongly depends on the sulfide producing ability of these bacteria. To enhance the efficiency of these processes, the response surface methodology (RSM) was used to optimize the culture conditions for sulfide production by an indigenous consortium of sulfate-reducing bacteria that was cultivated from the lead-contaminated wastewater in Dong Mai, a craft village known for the recycling of batteries in Hung Yen Experiments were conducted based on cenơal composite design (CCD) and analyzed using RSM. The sulfide production process was investigated as a function of three independent factors: the initial solution pH (6.5 - 8.5), the initial concentration of lactate (32 - 96 mM) and sulfate (16 - 32 mM). The results indicate that lactate, sulfate and pH were key factors for sulfide producing of the SRB consortium. The optimum conditions for the sulfide production were found to be 7.54, 53.41 mM and 22.64 mM, respectively, for initial solution pH, initial concentrations of lactate and sulfate.

điểm /   đánh giá
Published
2017-10-11
Section
Articles