摘要
采用敞开式SBR,分别研究曝气量为20、40、60和80 L·h-1工况下,短程硝化过程中溶解态N_2O的逸出规律及N_2O总产量。研究结果表明:曝气过程中溶解态N_2O释放速率与曝气量及溶解态N_2O浓度正相关,随着曝气量的增大,N_2O释放速率-溶解态N_2O浓度变化系数分别为0.001 5、0.002 4、0.003 5和0.004 3 s-1;在各种曝气量下的亚硝化过程中,溶解态N_2O浓度呈先增加后减少现象变化;短程硝化反应时间随曝气量的增长而明显缩短;在亚硝化反应过程中溶解态N_2O最大值及N_2O总产量随着曝气量的增大而明显减小;曝气量由低到高,亚硝化率逐步降低,分别为99.6%、94.9%、92.2%和85.5%,N_2O总产量分别为21.3、9.4、6.8和3.7 mg·L^(-1)。低曝气量(20 L·h-1)下,N_2O的产量远高于高曝气量(80 L·h-1)下的产量。中等强度曝气量(40 L·h-1、60 L·h-1)下,亚硝化过程既可以维持较高的亚硝化率,又可以有效地减少N_2O总产量。
The effect of aeration rates（ 20,40,60,and 80 L·h- 1） on the emission rate of dissolved N_2O,as well as the corresponding emission and production rates of N_2O in the nitritation process,were investigated using sequencing batch reactor tests in an open space. The results showed that the emission rate of dissolved N_2O was positively correlated with the aeration rate and the dissolved N_2O concentration. When the aeration rate increased,the variation factors of the N_2O release rate were 0. 001 5,0. 002 4,0. 003 5,and 0. 004 3 s- 1,respectively. It was also found that the concentration of dissolved N_2O increased initially,and then decreased during the nitritation process under all four aeration rates. The N_2O production decreased as the aeration rate increased. As the aeration rate increased,the ammonia oxidation rates were 99. 6%,94. 9%,92. 2%,and85. 5%,respectively,and the corresponding N_2O production rates were 21. 3,9. 4,6. 8,and 3. 7 mg·L- 1.The total emission amount of N_2O under 20 L·h- 1was much higher than it was under 80 L·h- 1. Moreover,the moderate aeration rates（ 40 L·h- 1and 60 L·h- 1） maintained efficient ammonia oxidation rates as well as acceptable N_2O emission.
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第1期174-180,共7页
Chinese Journal of Environmental Engineering
基金
中央高校基本科研业务费专项(2013G3292017
310829165020)
陕西省科技计划项目(2014K15-03-02)
关键词
曝气量
氧化亚氮
短程硝化
释放速率
aeration rate
nitrous oxide
nitritation process
emission rate
作者简介
黄楠（1990-），男，硕士研究生，研究方向：水污染控制工程。E-mail：24686135@qq．com
通信作者，E-mail：626710287@qq．com
