Advanced nitrogen removal via nitrite from municipal landfill leachate using a two-stage UASB–A/O system  

两级UASB-A/O工艺处理垃圾渗滤液并实现短程脱氮（英文）

作　　者：吴莉娜 彭永臻 史枭 彭澄瑶 张杰 

机构地区：[1]Beijing Institute of Petrochemical Technology [2]School of Municipal and Environmental Engineering, Harbin Institute of Technology [3]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology

出　　处：《Chinese Journal of Chemical Engineering》2015年第7期1225-1230,共6页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(51208040);a General Financial Grant from the China Postdoctoral Science Foundation(2013M541382);the National or Beijing Level College Students Innovation Training Projects-‘Free ammonia and free nitrous acid combined with inhibition of nitrification of landfill leachate’(14010221065)and‘Anaerobic–aerobic treatment of landfill leachate’(13010282007)

摘　　要：A system consisting of a two-stage up-flow anaerobic sludge blanket （UASB） reactor and an anoxic/aerobic （A/O） reactor was used to treat municipal landfill leachate. Denitrification took place in the first stage of the UASB reactor （UASB1）. The chemical oxygen demand of the UASB1 effluent was further decreased in the second stage （UASB2）. Nitrification was accomplished in the A/O reactor. When diluted with tap water at a ratio of 1：1, the ammonia nitrogen concentration of the influent leachate was approximately 1200 mg· L^-1, whereas that of the system effluent was approximately 8-11 mg· L^-1, and the corresponding removal efficiency is about 99.08%. Stable partial nitrification was achieved in the A/O reactor with 88.61%-91.58% of the nitrite accumulation ratio, even at comparatively low temperature （ 16℃）. The results demonstrate that free ammonia （FA） concentrations within a suitable range exhibit a positive effect on partial nitrification. In this experiment when FA was within the 1-30 mgmg· L^-1 range, partial nitrification could be achieved, whereas when FA exceeded 280 mgmg· L^-1, the nitrification process was entirely inhibited. Temperature was not the key factor leading to partial nitrification within the 16-29 ℃ range. The inhibitory influence of free nitrous acid （FNA） on nitrification was also minimal when pH was greater than 8.5. Thus, FA concentration was a major factor in achieving partial nitrification.A system consisting of a two-stage upfl ow anaerobic sludge blanket(UASB) reactor and an anoxic/aerobic(A/O)reactor was used to treat municipal land fill leachate. Denitri fication took place in the first stage of the UASB reactor(UASB1). The chemical oxygen demand of the UASB1 ef fl uent was further decreased in the second stage(UASB2). Nitri fication was accomplished in the A/O reactor. When diluted with tap water at a ratio of 1:1, the ammonia nitrogen concentration of the in fl uent leachate was approximately 1200 mg·L-1, whereas that of the system ef fl uent was approximately 8–11 mg·L-1, and the corresponding removal ef ficiency is about99.08%. Stable partial nitri fication was achieved in the A/O reactor with 88.61%–91.58% of the nitrite accumulation ratio, even at comparatively low temperature(16 °C). The results demonstrate that free ammonia(FA) concentrations within a suitable range exhibit a positive effect on partial nitri fication. In this experiment when FA was within the 1–30 mg·L-1range, partial nitri fication could be achieved, whereas when FA exceeded280 mg·L-1, the nitri fication process was entirely inhibited. Temperature was not the key factor leading to partial nitri fication within the 16–29 °C range. The inhibitory in fl uence of free nitrous acid(FNA) on nitri fication was also minimal when p H was greater than 8.5. Thus, FA concentration was a major factor in achieving partial nitri fication.

关 键 词：Landfill leachate Partial nitrification Free ammonia Free nitrous acid Low temperature 

分 类 号：X703.1[环境科学与工程—环境工程]