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

2009年第3卷第3期

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《环境科学与工程前沿（英文）》 >> 2009年第3卷第3期 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;

发布日期： 2009-09-05

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摘要

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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rare earth ; La³⁺ ; Ce³⁺ ; inorganic nitrogen ; nitrogen removal ; sequencing batch reactor