Magnetic microorganism immobilization material for removing ammonia nitrogen in water body and preparation method of magnetic microorganism immobilization material

The invention provides a magnetic microorganism immobilized material for removing ammonia nitrogen in a water body and a preparation method of the magnetic microorganism immobilized material, and belongs to the technical field of immobilized microorganism carrier wastewater treatment.The preparation method comprises the following steps that 1, Fe3O4 nanoparticles are prepared in the nitrogen atmosphere through a chemical coprecipitation method; (2) adding polyvinyl alcohol into water, and stirring and dissolving for 120 minutes at the temperature of 90-95 DEG C to obtain a polyvinyl alcohol gel solution; (3) adding sodium carboxymethyl cellulose into the polyvinyl alcohol gel solution at the temperature of 50-55 DEG C, and stirring for 120 minutes to obtain uniform mixed hydrogel; (4) cooling the mixed hydrogel to the temperature of 20-25 DEG C, adding diatomite, Fe3O4 nanoparticles and composite strains into the mixed hydrogel, and uniformly stirring to form composite hydrogel; (5) dropwise adding the compos