| abstract |
The utility model discloses a combined biological stuffing for removing ammonia nitrogen. The combined biological stuffing comprises a hollow plastic ball, wherein the hollow plastic ball is provided with a shell of a net structure, a porous polyurethane carrier and zeolite are filled inside the shell, the zeolite is filled at the lower part of the shell, and the porous polyurethane carrier is filled in the upper part of the shell. According to the combined biological stuffing, the porous polyurethane carrier and the zeolite are combined, and thus the microorganism attaching quantity in the stuffing is improved, and the standing time of autotrophic microorganisms is prolonged, and therefore, the ammonia nitrogen is efficiently degraded. |