Abstract: Provided are a strain ofBeijerinckia fluminensis and an application thereof in arsenic oxidation. The strain is AS-56, and has been deposited in the China Center for Type Culture Collection on 5 Dec. 2019, the deposit number being CCTCC NO: M 20191014. The strain AS-56 of Beijerinckia fluminensis can oxidise As(III) to the less toxic As(V) and can completely oxidize 0.15 g/L of As(III) solution to As(V), greatly reducing arsenic toxicity, and thus having wide prospects for application in environmental remediation.

Abstract: The invention discloses a method for identifying the bacterial species and key functional genes thereof involved in antimony reduction in the soil. After consuming the original substrate by starvation culture, the sole metabolic substrate is added and the sole electron acceptor Sb(V) is provided, so that there is only one dominant electron exchange process in the system. The microorganisms metabolize and oxidize the organic substrate while coupling with the reduction of antimony, so that Sb(V) gets electrons and is reduced to Sb(III). The present invention observes the Sb(V) reduction in an anaerobic culture system of paddy soil under Sb(V) stress, and uses DNA-SIP technology to identify the phylogenic information of microorganisms that can drive the Sb(V) reduction in the culture system.