Method for promoting phycomycetes biofilm to repair arsenic-containing water body by using manganese ions

The invention discloses a method for promoting a phycomycete biofilm to repair an arsenic-containing water body by using manganese ions, and relates to the field of water treatment. The method comprises the following steps: (1) collecting aquatic organism crust as a microorganism source, culturing in a culture medium, and centrifuging to obtain a phycomycete biological membrane; and (2) adding the phycomycetes biological membrane and the divalent manganese ions into the water body to be restored for culturing. The phycomycete biofilm is prepared by culturing biological components in crust widely existing in an aquatic environment, and the used phycomycete biofilm has high arsenic (As) resistance and can rapidly grow in an As-containing water body. Microorganisms are used for mediating bivalent manganese ion oxidation to generate manganese oxide on the surface of the phycomycetes biological membrane, so that As in water can be adsorbed or co-precipitated, and the As fixing capacity of the phycomycetes biologic