采用包埋法制备了粒径均匀的海藻酸钙(CA)硝化菌小球，并用不同浓度的NaCl溶液处理CA硝化菌小球来改善其扩散传质性能，以N-异丙基丙烯酰胺(NIPAAm)、丙烯酸(AA)为单体材料，形成温度/pH响应层，制得一种新型温度/pH双响应硝化菌凝胶小球。以NH4+?N为指示物考察不同制备条件下硝化菌凝胶小球的氨氮去除性能及对温度、pH的敏感特性，并将其应用于实际废水的脱氮处理。结果表明，经浓度为0.3%的NaCl溶液改性后的CA硝化菌小球的扩散传质性能最佳；15 mL温度响应溶液中NIPAAm为200 mg、MBA为4 mg，10 mL pH响应溶液中AA为200 mg、MBA为4 mg时双响应硝化菌小球的氨氮去除性能最好；当温度低至4℃时，氨氮去除率可达29.45%，当pH为9时，氨氮去除率仍可达35.48%。双响应硝化菌凝胶小球具有良好的温度、pH敏感特性，对实际废水中氨氮的去除也具有良好效果，有利于提高低温及碱性条件下硝化菌的硝化效果。

Calcium alginate (CA) nitrifying bacterial gel spheres with uniform particle size were drop-produced by the embedding method, and the effect of different concentrations of NaCl on the diffusion and mass transfer properties and mechanical strength of CA nitrifying bacterial gel spheres was investigated using the controlled variable method. The temperature-sensitive material N-isopropylacrylamide (NIPAAm) and the pH-sensitive material acrylic acid (AA) were combined onto the surface of NaCl-modified CA nitrifying bacteria gel spheres by stepwise polymerisation to form a temperature/pH-responsive layer on the surface of the spheres. A new type of temperature/pH dual response nitrifying bacterial gel spheres was prepared. NH4+?N was used as an indicator to investigate the ammonia nitrogen removal performance of nitrobacterial gel spheres and their sensitivity to temperature and pH under different preparation conditions, and the prepared temperature/pH dual response nitrifying bacterial gel spheres were applied to the actual nitrogen removal treatment of wastewater. The results showed that the CA nitrifying bacterial gel spheres modified with a concentration of 0.3% NaCl solution had the best diffusive mass transfer performance. The best ammonia removal performance of temperature/pH dual response nitrifying bacterial gel spheres was achieved at 200 mg of NIPAAm and 4 mg of MBA in 15 mL of temperature?response solution and at 200 mg of AA and 4 mg of MBA in 10 mL of pH?response solution. When the temperature was as low as 4℃, the ammonia nitrogen removal rate could reach 29.45%, when the pH was 9, the ammonia nitrogen removal rate could still reach 35.48%. Temperature/pH dual response nitrifying bacterial gel spheres have good temperature and pH sensitivity, and also have good effect on the removal of ammonia nitrogen in the actual wastewater, which is conducive to improve the nitrification effect of nitrifying bacteria under low temperature and alkaline conditions.