Separation of Hexavalent Chromium, Chemical Oxygen Demand and Sulfate from Artificial Wastewater for Biogenic Sulfide Corrosion

The aim of this work is to judge the possibility of using culture in mixed retrieval of toxic and carcinogenic hexavalent chromium mesophilic sulfate-reducing bacteria (SRB). In order to treat it effectively hexavalent chromium containing wastewater and sulfate-reducing bacteria culture was embraced to 60 mg/L of hexavalent chromium and maintained through repeated sub-culturing to increase the sulfate-reducing bacteria growth and activity. Experiments in module biosorption were carried out in vials of glass serum by sulfate-reducing bacteria cultured, fulfilling 83.1% of hexavalent chromium , 77.9% sulfate, 86.7% chemical oxygen demand removals under the following optimized circumstances, pH 7, 7 days of hydraulic retention time, 37 ◦ C temperature and 50 mg/L hexavalent chromium initial concentration. Moreover experiments in sorption were conducted on artificial wastewater under conditions for optimal operational performance and resulted in 89.2% hexavalent chromium, 81.9% chemical oxygen demand and 95.3% sulfate reduction from wastewater simulated. This work results in contribution to a better comprehension of metal uptake by biogenic sulfides and would be beneficial in the potential biosorbents development that possess hexavalent chromium uptake for high capacities from environments in aqueous environments.