Abstract:Experiment operated through dosing nitrite to aerobic and anoxic conditions respectively in A2O system. Effect of nitrite on nitrogen and phosphorus removal was analyzed. Results showed that nitrification, denitrification and phosphorus removal performance of the system were more sensitive to the presence of nitrite.Nitrite existed in aerobic period had more influence on the performance of nitrification, when nitrite concentration in aerobic period reached to 25mg/L, nitrification rate of the system was only 5.26mg/(L·h). Nitrite existed in anoxic period had more inhibition on denitrification performance, when nitrite existed in anoxic period for long time, denitrification rate of the system down to 11.83mg/(L·h) that fall by 60% compared with normal condition. Nitrite existed in aerobic period could inhibit the phosphorus absorption ability of phosphorus-accumulating bacteria seriously with phosphorus removal rate of the system was only 22%; When nitrite existed in anoxic period, it could cause sludge bulking problem in the system, lead to the loss of phosphorus-accumulating bacteria, the number of phosphorus-accumulating bacteria decreased to about 2.02%, which in turn trigger phosphorus removal performance deteriorated seriously.
宋姬晨, 王淑莹, 杨雄, 彭永臻. 亚硝酸盐对A2O系统脱氮除磷的影响[J]. 中国环境科学, 2014, 34(9): 2231-2238.
SONG Ji-Chen, WANG Shu-Ying, YANG Xiong, PENG Yong-Zhen. Effect of nitrite on nutrient removal in A2O system. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(9): 2231-2238.