Mechanism studies on nitrogen removal when treating ammonium-rich leachate by sequencing batch biofilm reactor |
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Authors: | Xu Zhengyong Yang Zhaohui Zeng Guangming Xiao Yong and Deng Jiuhua |
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Institution: | (1) College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China |
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Abstract: | The nitrogen removal mechanism was studied and analyzed when treating the ammonium-rich landfill leachate by a set of sequencing
batch biofilm reactors (SBBRs), which was designed independently. At the liquid temperature of (32 ± 0.4)°C, and after a 58-days
domestication period and a 33-days stabilization period, the efficiency of ammonium removal in the SBBR went up to 95%. Highly
frequent intermittent aeration suppressed the activity of nitratebacteria, and also eliminated the influence on the activity
of anaerobic ammonium oxidation (ANAMMOX) bacteria and nitritebacteria. This influence was caused by the accumulation of nitrous
acid and the undulation of pH. During the aeration stage, the concentration of dissolved oxygen was controlled at 1.2–1.4
mg/L. The nitritebacteria became dominant and nitrite accumulated gradually. During the anoxic stage, along with the concentration
debasement of the dissolved oxygen, ANAMMOX bacteria became dominant; then, the nitrite that was accumulated in the aeration
stage was wiped off with ammonium simultaneously.
Translated from Acta Scientiae Circumstantiae, 2006, 26(1): 55–60 译自: 环境科学学报] |
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Keywords: | landfill leachate sequencing batch biofilm reactor (SBBR) partial nitrification anaerobic ammonium oxidation |
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