New Isolated Extremophiles Arsenic Oxidizing Bacteria for the Removal of Arsenic from High- and Low-COD Media

Document Type : Research Paper


1 PhD. Candidate, Dept. of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran

2 Assoc. Prof., Dept. of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran

3 Prof., Dept. of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Iran

4 Prof., Dept. of Chemical and Civil Engineering, School of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran

5 Prof., Dept. of Water Engineering, School of Agriculture, Shiraz University, Shiraz, Iran


There is an urgent need for the removal of arsenic (As) from groundwater and wastewater as it is a very hazardous heavy metal for human and environmental health. In this research, As-resistant and oxidizing bacteria were isolated from the Maharloo Lake (27 km southeast of Shiraz city) and identified to a great extent. Three isolated bacillus-shaped strains (called F5, F6 and F7) tolerated up to 1 M AsNaO2, grew up to 3.5 M NaCl and pH 12, and consumed NaSCN and Na2S2O3. The molecular analysis confirmed the originality of the strains to a high extent. The As absorption rate by these bacteria was measured by the atomic absorption method, and their effect was examined on a water sample from the south of Kerman city (Iran) and a synthetic wastewater sample with a chemical oxygen demand (COD) of about 180,000 kg/m3 that was able to absorb high levels of arsenic.


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