Preparation and application of biochar immobilized microbial inoculum capable of treating nitrogen pollution of water body

The invention discloses preparation and application of a biochar immobilized microbial inoculum capable of treating nitrogen pollution of a water body, and relates to the technical field of water pollution microbial inoculum treatment.The preparation method comprises the following steps that reed and silvergrass straw materials are subjected to oxygen-limited pyrolysis operation, biochar is obtained and then smashed, and the smashed biochar is sieved through a 20-mesh sieve to prepare biochar powder; the preparation method comprises the following steps: feeding a mixed microbial solution and charcoal powder into an air-floating refining device, uniformly mixing, culturing the prepared mixture on a shaking table, carrying out centrifugal separation operation on the culture, controlling the rotating speed of the centrifugal separation operation to be 1000r/min, controlling the centrifugal time to be 5min, discharging supernate, and airing solid substances in a room at 20 DEG C to prepare the microbial agent. Ac