Advanced landfill leachate treatment using a two-stage UASB-SBR systemat low temperature
Hongwei Sun , Qing Yang , Yongzhen Peng , Xiaoning Shi , Shuying Wang , Shujun Zhang
DOI:
Received March 01, 2009,Revised December 28, 2009, Accepted , Available online
Volume 22,2010,Pages 481-485
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A two-stage upflow anaerobic sludge blanket (UASB) and sequencing batch reactor (SBR) system was introduced to treat landfill
leachate for advanced removal of COD and nitrogen at low temperature. In order to improve the total nitrogen (TN) removal e ciency
and to reduce the COD requirement for denitrification, the raw leachate with recycled SBR nitrification supernatant was pumped into
the first-stage UASB (UASB1) to achieve simultaneous denitrification and methanogenesis. The results showed that UASB1 played
an important role in COD removal and UASB2 and SBR further enhanced the nutrient removal e ciency. When the organic loading
rates of UASB1, UASB2 and SBR were 11.95, 1.63 and 1.29 kg COD/(m3 day), respectively, the total COD removal e ciency of
the whole system reached 96.7%. The SBR acted as the real undertaker for NH4
+-N removal due to aerobic nitrification. The system
obtained about 99.7% of NH4
+-N removal e ciency at relatively low temperature (14.9–10.9°C). More than 98.3% TN was removed
through complete denitrification in UASB1 and SBR. In addition, temperature had a significant e ect on the rates of nitrification and
denitrification rather than the removal of TN and NH4
+-N once the complete nitrification and denitrification were achieved.
