不同碳氮比对亚硝酸盐积累的影响

The Effects of Different C/N on Nitrite Accumulation

亚硝化-厌氧氨氧化工艺的关键技术之一是实现亚硝酸盐的稳定积累。实验采用SBR反应器,在温度为30℃,HRT为24 h,DO<1 mg/L的运行条件下,当进水氨氮浓度为600 mg/L时,运行至第45 d时,可实现亚硝酸盐的稳定积累,最高NPR可达0.15 kg/(m3·d)。在同种运行条件下,当C/N<0.34时,外加有机碳源对亚硝酸盐的累积有促进作用,最高NPR可以达到0.26kg/(m^3·d),出水NH_4^+-N/NO_2^--N=1~1.5之间。因此实现亚硝酸盐积累的最佳C/N介于0.17~0.34之间。

The nitrite accumulation was regarded as the key to the Nitrification-Anammox process. In the operating condition that the temperature was 30 ℃, HRT was 24 h, DO1 mg/L, when the influent NH4＋-N concentration was 600 mg/L, the SBR reactor was started up steadily. Under the same operating condition, when the C/N0.34, the nitrite accumulation could be promoted by the additional organic carbon, the NPR could be up to 0.26 kg/（m^3·d）, the effluent NH_4~＋-N/ NO_2^-N was during 1~1.5. So the best C/N of nitrite accumulation was during 0.17~0.34.