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Experimental Study on Removal of Arsenic and Antimony from Wastewater by Sulfate Reducing Bacteria (Vol. 49, No.5, Tot No.343 2021) TEXT SIZE: A A A

LIU Fengjuan1, ZHANG Guoping2, YU Lezheng3, MA Chao2

(1.School of Geography and Resources, Guizhou Education University, Guiyang 550018, China;
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
3.School of Chemistry and Materials Science, Guizhou Education University, Guiyang 550018, China)

Abstract: To clarify the feasibility of removing arsenic and antimony simultaneously from wastewater by sulfate reducing bacteria (SRB) and whether there were any interactions between arsenic and antimony during the removal process, we set up five groups (two control group, an arsenic treatment group, an antimony treatment group, an arsenic and antimony treatment group) and then compared the differences in the growth of SRB and the difference in the removal rates of arsenic and antimony by SRB in different treatment groups. The results showed that SRB could remove more than 95% of total antimony (Sb(T)), but for total arsenic (As(T)), sulfate reducing bacteria could only remove 6% under the same condition and the same initial concentration. When the two elements coexisted, the removal efficiency of Sb(T) by SRB did not change significantly, but the removal efficiency of As(T) increased significantly. During the treatment process, the aqueous Sb(T) quickly dropped to a much lower concentration and then remained stable, while, As(T) decreased slowly and then increased due to the dissolution of the generated precipitate in the later period. In general, sulfate reducing bacteria could remove Sb more efficiently, and the proceeding of removing As was more sensitive to the physical and chemical conditions of the matrix, therefore, it was necessary to explore a more suitable matrix environment to strengthen the removal effect of the two elements.

Key word: sulfate reducing bacteria; arsenic; antimony

EARTH AND ENVIRONMENT Vol.49, No.5, Tot No.343, 2021, Page 586-593

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