▎ 摘　　要

NOVELTY - Preparing modified magnetic suspension biological carrier comprises (a) preparing high-density polyethylene base, modified functional material and magnetic powder, and then drying for removing water, (b) preparing metal organic framework system of chromium-MIL-101-ammonia/carbon quantum dot configuration, preparing carbon nanotube sponge, heating metal organic framework system, adding zero-valent iron and graphene into metal organic framework system to obtain iron/graphene doped metal organic framework system composition, preparing iron/graphene doped metal organic framework/carbon nanotube system composition, then mixing with diatomaceous earth, and talc to obtain modified functional material, (c) mixing high-density polyethylene base material, modified functional material and magnetic powder to prepare carrier, stirring, extruding, and cutting to obtain carrier particles, (d) extruding to obtain cylindrical carrier, and (e) magnetizing. USE - The biological carrier is useful for nitrosification process, and improving flora removal rate of ammonia nitrogen. ADVANTAGE - The biological carrier: has high hydrophilicity and conductivity; promotes the direct inter-species electron transfer of anaerobic ammonia oxidizing bacteria; and increases the functional design of traditional suspended biological carriers.