序批式生物膜反应器(SBBR)处理高氨氮渗滤液的脱氮机理研究

Mechanism studies on the nitrogen removal when treating the ammonia nitrogen rich leachate by sequencing batch biofilm reactor (SBBR)

采用自主设计的SBBR反应器处理氨氮浓度含量较高的垃圾填埋场渗滤液并对其脱氮机理进行分析.在保持(32±0.4)℃的环境温度下,经过58d的驯化和33d的稳定,SBBR反应器的脱氮效率最高达到95%.实验结果表明,高频间歇式曝气方式在抑制了硝酸细菌的活性的同时也消除了亚硝酸盐浓度和pH大幅波动对亚硝酸细菌和厌氧氨氧化细菌活性的影响;在曝气阶段,溶解氧浓度被控制在1.2～1.4mg·L-1,亚硝酸细菌成为主体细菌,亚硝酸盐积累;在缺氧阶段,随着溶解氧浓度迅速降低,厌氧氨氧化细菌成为优势菌种,曝气阶段积累的亚硝酸盐与氨氮同时被去除.

It was studied and analysed on the mechanism on the nitrogen removal when treating the leaehate with high concentration of ammonia and nitrogen by sequencing batch biofilm reactor（SBBR） designed independently. Under the ambient temperature of （32 ± 0. 4）℃ , and after a 58-day-long period of domestication and a 33-day-long period of stability, the ammonia nitrogen removal efficiency reached 95% in the SBBR reactor. The way of high frequency intermittent aeration suppresses the activity of nitrobacteria, and also eliminates the influence of nitrous acid and pH undulation to the activity of anaerobic ammonia oxidation bacteria and nitrous acid bacteria. In the period of aeration, the dissolve oxygen concentration was controlled at 1.2 - 1.4 mg·L^-1 ; the nitrous acid bacteria became the major part, and nitrite accumulated. In the period of bypoxia, along with the debasement of the dissolve oxygen concentration, anaerobic ammonia oxidation bacteria became the domestic status, nitrite and ammonia nitrogen accumulated in the period of aeration was removed at the same time.