SBR单级自养脱氮系统氮素转化途径

Nitrogen conversion pathway of autotrophic nitrogen removal process in single SBR

利用氮素计量关系和批式实验研究了SBR系统中基于短程硝化的单级自养脱氮特性和脱氮途径。结果表明,SBR系统获得良好脱氮效果,TN最高去除负荷和去除速率分别达0.49 kg N/(m3.d)和0.20 kg N/(kg VSS.d);系统中82%的氨氮转化成气体脱除,10%的氨氮转化成硝酸盐氮。批式实验结果表明,SBR系统中的污泥同时具有厌氧氨氧化、亚硝酸盐氧化和自养反硝化活性,三者的反应速率分别为0.12 kg NH4+-N/(kg VSS.d)、0.04 kg NO2--N/(kg VSS.d)和0.03 kg NO2--N/(kg VSS.d)。综上,SBR系统中氮的脱除是短程硝化、厌氧氨氧化和反硝化共同作用的结果,产生的硝酸盐是厌氧氨氧化和硝化作用所致。

Batch experiments and stoichiometry were employed to demonstrate the performance and nitrogen conversion pathway of autotrophic nitrogen removal in single SBR. The sequencing batch reactor was performed well, and the removal volume loading and removal rate reached 0.49 kg N/（m3 ~ d） and 0.20 kg N/（kg VSS · d） , respectively. 82% of ammonia was converted to dinitrogen gas, and 10% of ammonia was converted to nitrate. From batch experiments, anammox activity of 0. 12 kg NH＋4-N/（kg VSS · d）, nitrification activity of 0.04 kg NO2 -N/（ kg VSS · d） and autotrophic denitrification activity of 0.03 kg NO2--N/（ kg VSS · d） were achieved, respectively. It revealed the coexistence of shortcut nitrification, anammox and denitrification with hydrogen as electron donor in SBR and the nitrate was caused by anammox and nitrification.