新型IEM-UF耦合短程硝化反硝化系统脱氮特性

针对低碳氮比生活污水的特点，提出新型离子交换膜-超滤组合膜（IEM-UF）氮富集短程硝化反硝化脱氮工艺.研究了新型IEM-UF亚硝化反硝化脱氮系统在三阶段运行工况下各反应器的性能及整个系统的脱氮及COD去除效果，同时应用高通量技术探究菌群结构变化对脱氮效果的影响.试验结果表明：C/N为3，亚硝化反应器中DO=0.5mg/L条件下，亚硝化反应器中NO₂^--N积累率仅用19d就达到了90%；在短程反硝化进水流量比为2：1的条件下，COD及NO_x^--N平均去除率分别达到80%和89%以上.TN去除率最高达到64.8%.高通量16S rDNA测序结果表明，三阶段菌群结构变化与系统脱氮效果的变化一致，亚硝化反应3个阶段亚硝化单胞菌Nitrosomonas所占比例分别为3.69%、5.48%和0.53%，反硝化反应3个阶段反硝化菌Dechloromonas、Thauera之和占活性污泥总菌群比例达到33.35%、25.62%、20.52%.

Study onthe nitrogen removal performance ofnew IEM-UF with shortcut nitrification denitrification system

Inthis research, a new system that combination of the ion exchangemembrane and ultrafiltration membrane (IEM-UF) nitrogen enrichment with shortcut nitrification and denitrification was proposed for low carbon nitrogen ratio of domestic sewage. The performance of nitrogen and COD removalin the system were studiedunder the three stage operating condition. Meanwhile, the characteristicsof the microbial community in the system were analyzed by high throughput technology, andthe effect of the flora changes on the nitrogen removal was investigated. The rate of nitrite accumulation in the shortcut nitrification reactor reached above 90%only 19d when C/N was 3and DO=0.5mg/L.When the ratio of denitrifying influent was 2:1, the average removal rates of COD and NO_x^--Nreached above 80% and 89%, respectively. The maximum removal rate of TN was above 64.8%. Besides, the change of bacterial community structure in the three stage was consistent with the change of nitrogen removal efficiency. Under the three operatingconditions, the proportion of Nitrosomonas accounted for the proportion of the genus in the shortcut nitrification reactor was about 3.69%, 5.48% and 0.53% respectively. As well asthe sum of denitrifying bacteria Dechloromonas and Thauera in the denitrification reactor accounted for 33.35%, 25.62% and 20.52%, respectivelyunder the three stage.