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

Lina Wu; Yongzhen Peng; Xiao Shi; Chengyao Peng; Jie Zhang

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

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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 re-actor (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 accumula-tion ratio, even at comparatively low temperature (16 °C). The results demonstrate that free ammonia (FA) con-centrations within a suitable range exhibit a positive effect on partial nitrification. In this experiment when FA was within the 1–30 mg·L−1 range, partial nitrification could be achieved, whereas when FA exceeded 280 mg·L−1, the nitrification process was entirely inhibited. Temperature was not the key factor leading to par-tial nitrification within the 16–29 °C 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.

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《中国化学工程学报（英文版）》 |2015年第7期|1225-1230|共6页
作者
Lina Wu; Yongzhen Peng; Xiao Shi; Chengyao Peng; Jie Zhang;
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Beijing Institute of Petrochemical Technology, Beijing 102617, China;

Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;

Beijing Institute of Petrochemical Technology, Beijing 102617, China;

Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;

School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;

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

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