环境温度下短程硝化反硝化试验研究

Study on Shortcut Nitrification and Denitrification at Ambient Temperature

在环境温度(20～30℃)下,通过控制反应体系的曝气量和pH,培养了短程硝化反硝化污泥,成功实现了SBR短程硝化反硝化。试验结果表明,在高pH条件下,有利于NH3-N的氧化,同时NO2--N的累积率大大增加;降低曝气量可提高NO2--N在体系中的累积率,控制系统的DO为0.4～0.7mg/L(曝气量为0.1L/min)、pH=8.3,在进水NH3-N为50mg/L时,NO2--N累积率>70%;高进水NH3-N浓度对硝酸菌有明显的抑制作用,而对亚硝酸菌的影响不大,进水NH3-N为120mg/L时,NO2--N累积率可达80%。

The shortcut nitrification and denitrification in SBR was realized by controlling pH and aeration rate at ambient temperature of 20 to 30℃. The results show that the high pH is favorable to ammonia nitrogen oxidation and nitrite accumulation. The low aeration rate can increase the nitrite accumulation rate. When the DO is 0.4 to 0.7 mg/L （aeration rate of 0.1 L/min） , pH is 8.3, and the influent ammonia nitrogen is 50 mg/L, the nitrite accumulation rate can achieve more than 70%. The high concentration of ammonia nitrogen in the influent has significant inhibition of nitrobacteria and little influence on nitrosobacteria. The nitrite accumulation rate can achieve 80% when the influent ammonia nitrogen is 120 mg/L.