Microcystin degrading strain and method for degrading MC-LR (microcystins-LR) by same

The invention belongs to technical field of environmental-friendly water treatment and relates to an MC-LR (microcystin-LR) degrading strain screened from bottom sediments of streamsides with high blue-green algae pollution in the Taihu Lake and a method for degrading microcystins by the same. Currently, the strain is preserved in the China general microbiological culture collection center (CGMCC) and has a preservation number of CGMCC NO.4498. By identification, the strain is bacillus (bacillussp.). The method for degrading the microcystins by the MC-LR degrading strain comprises the following steps of: inoculating the MC-LR degrading strain into an inorganic salt culture medium which uses the MC-LR as the only carbon source and nitrogen source and has a pH value of 5 to 9 according to an inoculation rate of 2 to 10 mass percent; and cultivating the MC-LR degrading strain for 48 hours in a shaking table at a temperature of 30 DEG C under a rotating speed of 100 to 180 r/min so as to degrade the MC-LR. The stain is screened from a water body of the Taihu Lake, is suitable for the natural environment of the Taihu watershed and has wide application prospect for removing the MC-LR in the water body of the Taihu watershed by a biological method.