气提式三重循环生物膜反应器用于制药废水的处理

Study on Treatment of Pharmaceutical Industry Wastewater by Triplet Loop Airlift Biofilm Reactor

采用气提式三重循环生物膜反应器（TLABR）处理制药废水，稳定阶段对COD和NH4^＋-N的去除率分别为73％和70％。当温度为27～30℃、pH=8．5时，反应器内形成了稳定的NO2^--N积累。同时，考察了不同HRT下高效反应器的处理效果，探讨了pH对反应器内发生的短程硝化效果的影响以及亚硝化菌对游离氨浓度的适应性。结果表明：在HRT为3、6、9h下，对COD和氨氮的去除率分别为65．3％、73．9％、75．1％和48．9％、68．4％、72．8％；NO2^--N积累率分别为92．7％、76．2％、69．7％；反应器出水水质稳定，体现了高效性和抗冲击负荷能力。

Laboratory-scale experiments were conducted by using the Triplet Loop Airlift Biofilm Reactor （TLABR） to treat wastewater from pharmaceutical factory. In the steady phase, the removal rates of COD and ammonia nitrogen are 73% and 70% respectively. The steady accumulation of NO^2- - N can be achieved at temperature of 27 - 30 ℃, pH of 8.5. Meanwhile, the effects of HRT were investigated. The questions about the effect of pH on shortcut nitrification and the adaptivity of nitrite-oxidizing bacteria to the free ammonia were also discussed. The experimental results indicate that the removal rates of COD and ammonia are 65.3% , 73.9% , 75.1% , and 48.9% , 68.4% , 72.8% when the HRT is 3, 6 and 9 h respectively. The rates of the nitrite accumulation are 92.7%, 76.2%, and 69.7%. In the whole period of the experiments, the effluent quality of the bioreactor is kept steady, which shows that the bioreactor has high efficiency and high flexibility with respect to fluctuating loading rates.