Removal of BOD5 and COD From Saline Wastewater Using Fixed Bed Column of Aspergillus Oryzae and Halobacillus Dabanensis

Abstract

5-day BOD and COD can be removed by biological aerobic treatment of saline wastewater. In this research, halophilic microorganisms, namely Aspergillus oryzae and Halobacillus dabanensis were isolated from a return sludge basin of a wastewater treatment plant in the City of Bandar Abbas in southern Iran , that contained a Total Dissolved Solid (TDS) of about 7500 mg l -1 . These microorganisms (bacteria and fungi) could tolerate 20% concentration of salt (NaCl) in Sabouraud-4% dextrose agar and Sabouraud-2% dextrose broth medium and brain heart (BHI) agar and BHI broth medium. The films of Aspergillus oryzae and Halobacillus dabanensis were formed around the Caalginate. These bioflims were introduced to a fixed bed column, on top of which saline wastewater was released with flow rates of 2-6 ml min . The removal process in fixed bed column was stopped after 1200 minutes.