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Frontiers of Environmental Science & Engineering >> 2009, Volume 3, Issue 3 doi: 10.1007/s11783-009-0036-1

Effects of La, Ce on nitrogen removal in sequencing batch reactor

1.State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210093, China;China National Environmental Monitoring Center, Beijing 100012, China; 2.State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210093, China; 3.Jiangsu Jiangshan Pharmaceutical Co., Ltd., Jingjiang 214500, China; 4.Grandway Technology International Co., Ltd., Beijing 100102, China;

Available online: 2009-09-05

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Abstract

Batch experiments were conducted to study the short-term biological effects of rare earth ions (La, Ce) and their mixture on the nitrogen removal in a sequencing batch reactor (SBR). The data showed that higher NH―N removal rate, total inorganic nitrogen removal efficiency, and denitrification efficiency were achieved at lower concentrations of rare earth elements (REEs) (<1mg/L). In the first hour of the aeration stage of SBR, the presence of REEs increased the total inorganic nitrogen removal efficiency and NH―N removal efficiency by 15.7% and 10%―15%, respectively. When the concentrations of REEs were higher than 1mg/L, the total inorganic nitrogen removal efficiency decreased, and nitrate was found to accumulate in the effluent. When the concentrations of REEs was up to 50.0mg/L, the total inorganic nitrogen removal efficiency was less than 30% of the control efficiency with a high level of nitrate. Lower concentrations of REEs were found to accelerate the nitrogen conversion and removal in SBR.

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