Removal of organic matters and ammonia in landfill leachate via a UASB and anozic/aerobic bioreactor process
A combined system consisting of an up-flow anaerobic sludge blanket (UASB) and anoxic /aerobic bioreactor was introduced to treat a mature landfill leachate with a high ammonia concentration and low ratio of COD/TN. After 160 days of stable operation, the results indicated that organic matters were mainly removed by the UASB, while the ammonia was removed by shortcut nitrification in the anoxic /aerobic tank. The COD removal efficiency reached 50％-60％ at an organic loading rate (OLR) of 3.0kgCOD/ (m3d). The nitrite accumulation rate and the NH4+-N removal efficiency were above 90％ and 85％ respectively when the reactor maintained a low dissolved oxygen (DO) concentration (1.0-1.2mgL-1) and pH value (7.8-8.3) and temperature (25-30℃) in the aerobic reactor. Also the results revealed a significant amount of nitrogen was removed by shortcut denitrification in the anoxic tank. The total nitrogen (TN) removal rate reached 60％-70％. The results analyzed by scanning electron microscope（SEM）reflected the shape and variety of the anaerobic and aerobic bacteria in the whole system.
UASB Shortcut nitrification Nitrite accumulation landfill leachate
Lihui Huang Baoyu Gao Peng Guo Bo Zhang
School of environmental science and engineering Shandong University Jinan,China Environmental Protection Bureau of Shandong Province Jinan,China
国际会议
北京
英文
1-6
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）