Abstract
p-arsanilic acid (p-ASA) contamination in highly saline environments has received increasing attention; however, p-ASA removal by salt-tolerant Mn(II)-oxidizing bacteria (MnOB) has not yet been reported. In this study, a salt-tolerant Mn(II)-oxidizing bacterium, Pseudomonas sp. KW-2, was isolated, and its capacity to efficiently oxidize Mn(II), form biogenic Mn oxides (BMO) and remove p-ASA was evaluated. Batch experiments indicated that KW-2 had good Mn(II) oxidation capacity (BMO~100μM) when the salinity of the medium ranged from 15.00g/L to 55.00g/L. Strain KW-2 exhibited strong p-ASA removal efficiency (80.38%) via in situ-formed BMO when the initial concentration of p-ASA was 5.00mg/L. p-ASA removal by strain KW-2 was driven primarily by the oxidation of BMO (84.45%), and the released inorganic arsenic major entered the crystal structure of the BMO precipitates. This study provides a feasible method for the bioremediation of p-ASA in high-salt environments.
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