运行方式对曝气生物滤池实现短程硝化的影响

Effect of Operational Modes on Shortcut Nitrification in Biological Aerated Filter

为研究曝气生物滤池处理氨氮废水时运行方式对实现短程硝化的影响,进行了连续进水交替曝气、进水曝气停水停气和进水停气停水曝气3种运行方式试验,并考察了连续进水交替曝气条件下3种不同交替曝气时段分配比例,即曝气:停气分别为(4:4)、(5:3)、(2:2:2:2)对系统运行效果的影响。结果表明,在连续进水交替曝气条件下,当进水氨氮为53～101 mg/L、温度为33℃、水力停留时间为8 h、气水比为22.7、交替曝气时段分配比例为5:3时可实现并维持90%以上的亚硝酸盐氮积累率,此时对氨氮的去除率也在70%以上。研究表明,通过调控运行方式可较好地实现曝气生物滤池的短程硝化,并获得较高的氨氮去除率和亚硝酸盐氮积累率。

In order to investigate the effect of operational modes on shortcut nitrification in a bio logical aerated filter for treatment of ammonia nitrogen wastewater, three operational modes including continuous influent with alternating aeration, influent with aeration and no influent without aeration, and influent without aeration and no influent with aeration were carried out. Moreover, in the case of continuous influent with alternating aeration, the performances of the biological aerated filter were investigated at three time phase ratios of aeration to no aeration, which were4 ： 4, 5 ： 3 and 2 ： 2 ： 2 ： 2. The experimental results show that the nitrite accumulation rate of more than 90% and the ammonia nitrogen removal rate of more than 70% can be achieved and maintained under the condition of continuous influent with alternating aeration, with influent ammonia nitrogen of 53 to 101 rag/L, temperature of 33℃, HRT of 8 h, air to water ratio of 22.7 and aeration to no aeration ratio of 5 ： 3. This research indicates that the biological aerated filter can realize shortcut nitrification with a higher ammonia nitrogen removal rate and a higher nitrite accumulation rate via controlling the operational modes.