SNAD反应器中颗粒污泥和絮体污泥脱氮特性

通过血清瓶批试研究了温度为30℃时, SNAD(simultaneous partial nitrification, anaerobic ammonium oxidization and denitrification)反应器内的颗粒污泥R1(1~2.5mm)和絮体污泥R2(0~0.25mm)的脱氮特性. 结果表明,颗粒污泥的好氧氨氮和好氧亚硝态氮氧化活性分别为0.166,0kgN/(kg VSS×d).厌氧氨氧化、亚硝态氮反硝化、硝态氮反硝化总氮去除速率分别为0.158,0.105,0.094kgN/(kg VSS×d).絮体污泥的好氧氨氮氧化活性和好氧亚硝态氮氧化活性分别为 0.180,0kgN/(kg VSS×d).厌氧氨氧化、亚硝态氮反硝化、硝态氮反硝化总氮去除速率分别为0.026,0.096,0.108kgN/(kg VSS×d).颗粒污泥和絮体污泥都具有良好的亚硝化性能和反硝化性能.颗粒污泥的厌氧氨氧化性能良好,絮体污泥的厌氧氨氧化性能较差.扫描电镜显示,在SNAD颗粒污泥的表面主要是一些短杆菌和球状菌.在SNAD颗粒污泥中心区域主要为火山口状细菌.在絮体污泥中,同时存在短杆菌,球状菌和火山口状细菌.

The nitrogen removal performance of granules and flocs in SNAD reactor

The nitrogen removal performance of granules R1 (1~2.5mm) and flocs R2 (0~0.25mm) retrieved from SNAD (simultaneous partial nitrification, anaerobic ammonium oxidization and denitrification)reactor was investigated by serum bottle batch tests under 30℃. To the granules, the aerobic ammonium and aerobic nitrite oxidation activity were 0.166and 0kgN/(kg VSS×d), respectively. The specific anammox activity, denitrification activity over nitrite, denitrification activity over nitrate were 0.158, 0.105, 0.094kgN/(kg VSS×d), respectively. To the flocs, the aerobic ammonium and aerobic nitrite oxidation activity were 0.180 and 0kgN/(kg VSS×d), respectively. The specific anammox activity, denitrification activity over nitrite, denitrification activity over nitrate were 0.026, 0.096, 0.108kgN/(kg VSS×d), respectively. Both granules and flocs exhibited good partial nitrification activity and denitrification activity. The specific anammox activity of granules was obvious while the flocs showed little specific anammox activity. The SEM indicated that the bacteria in the outer part of the SNAD granule were mainly short rod-shaped and spherical. In the inner part of the SNAD granule, the bacteria were mainly crater-shaped. In flocs, the bacteria were mainly short rod-shaped, spherical and crater-shaped.