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

doi:10.1016/j.cjche.2015.05.014

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (7): 1225-1230.DOI: 10.1016/j.cjche.2015.05.014

• 能源、资源与环境技术 • 上一篇下一篇

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

Lina Wu^1,2, Yongzhen Peng³, Xiao Shi¹, Chengyao Peng³, Jie Zhang²

1 Beijing Institute of Petrochemical Technology, Beijing 102617, China;
2 School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;
3 Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China

收稿日期:2014-12-12 修回日期:2015-04-17 出版日期:2015-07-28 发布日期:2015-08-21
通讯作者: Yongzhen Peng
基金资助:
Supported by theNationalNatural Science Foundation of China (51208040), a General Financial Grant from the China Postdoctoral Science Foundation (2013M541382), and by 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).

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

Lina Wu^1,2, Yongzhen Peng³, Xiao Shi¹, Chengyao Peng³, Jie Zhang²

1 Beijing Institute of Petrochemical Technology, Beijing 102617, China;
2 School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China;
3 Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China

Received:2014-12-12 Revised:2015-04-17 Online:2015-07-28 Published:2015-08-21
Contact: Yongzhen Peng
Supported by:
Supported by theNationalNatural Science Foundation of China (51208040), a General Financial Grant from the China Postdoctoral Science Foundation (2013M541382), and by 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/Abstract

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 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 partial nitrificationwithin 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.

关键词: Landfill leachate, Partial nitrification, Free ammonia, Free nitrous acid, Low temperature

Abstract: 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 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 partial nitrificationwithin 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.

Key words: Landfill leachate, Partial nitrification, Free ammonia, Free nitrous acid, Low temperature

Lina Wu, Yongzhen Peng, Xiao Shi, Chengyao Peng, Jie Zhang. Advanced nitrogen removal via nitrite from municipal landfill leachate using a two-stage UASB-A/O system[J]. Chinese Journal of Chemical Engineering, 2015, 23(7): 1225-1230.

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10.1016/j.cjche.2015.05.014

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

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

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