移动床生物膜反应器对垃圾渗滤液短程硝化研究

采用好氧移动床生物膜反应器（MBBR）对经过厌氧脱碳处理的垃圾渗滤液进行了深度短程硝化研究,考察了在中温（25℃）条件下DO浓度、pH值、C/N等因素对氨氮去除效果和短程硝化效果的影响.结果表明,在进水氨氮浓度为400　mg·L^-1,HRT为24 h情况下,当控制DO为2　mg·L^-1、pH值在8左右和C/N小于3时,氨氮去除率能达到70%以上,亚硝酸盐氮的积累率高达90％.间歇试验证明了该生物膜反应器中亚硝化菌的数量和活性要远高于硝化菌.该移动床生物膜工艺可以选择性固定和积累氨氧化细菌,从而实现较高的氨氮去除率和稳定的亚硝酸盐氮积累率.

Short-Cut Nitrification of Landfill Leachate by Aerobic Moving-Bed Biofilm Reactor

Short-cut nitrification process was studied to remove the ammonium nitrogen from the anaerobically pretreated leachate using aerobic moving-bed biofilm reactor (MBBR) at ambient temperature. The effect of DO concentration, pH and C/N ratio on the ammonium removal efficiency and nitrite accumulation rate was investigated, respectively. Experimental results showed that, more than 70% of ammonium removal efficiency and about 90% of nitrite accumulation rate could be achieved when the reaction conditions were controlled as follows: HRT at 24 hours, DO concentration at 2 mg x L(-1), pH at 8 and C/N ratio less than 3. Batch experiments showed that the quantity and activity of ammonia oxidizing bacteria were much higher than those of nitrite oxidizing bacteria. MBBR could effectively remove ammonium nitrogen from leachate and easily obtain a stable nitrite accumulation rate due to the selective immobilization and accumulation of ammonia oxidizing bacteria on the bio-carrier.