Kamde, Kalyani and Pandey, R A and Thul, Sanjog and Bansiwal, A (2018) Removal of arsenic by Acidothiobacillus ferrooxidans bacteria in bench scale fixed-bed bioreactor system. Chemistry and Ecology, 34 (9). pp. 818-838. ISSN 0275-7540 (P); 1029-0370 (E)

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In the present study arsenic contaminated simulated water and groundwater was treated by the combination of biological oxidation of tri-valent arsenite [As (III)] to penta-valent arsenate [As (V)] in presence of Acidothiobacillus ferrooxidans bacteria and its removal by adsorptive filtration in a bioreactor system. This method includes the immobilisation of A.ferrooxidans on Granulated Activated Carbon (GAC) capable of oxidising ferrous [Fe (II)] to ferric [Fe (III)]. The Fe (III) significantly converts the As (III) to As (V) and ultimately removed greater than 95% by the bed of GAC, limestone, and sand. The significant influence of Fe (II) concentration (0.1–1.5 gL−1), flowrate (0.06–0.18 Lh−1), and initial As (III) concentration (100–1000 μgL−1) on the arsenic removal efficiency was investigated. The simulated water sample containing the different concentration of As (III) and other ions was used in the study. The removal of other co-existing ions present in contaminated water was also investigated in column study. The concentration of arsenic was found to be <10 μgL−1 which is below Maximum Contaminant Level (MCL) as per WHO in treated water. The results confirmed that the present system including adsorptive-filtration was successfully used for the treatment of contaminated water containing As (III) ions.

Item Type: Article
Uncontrolled Keywords: Bioreactor; Acidothiobacillus Ferrooxidans; Immobilisation; Iron
Subjects: Environmental Biotechnology
Chemistry, Chemical Technology
Water Treatment
Depositing User: Dr. S Thul
Date Deposited: 13 Jan 2021 09:40
Last Modified: 13 Jan 2021 09:40
URI: http://neeri.csircentral.net/id/eprint/1290

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