Effects of La,Ce on nitrogen removal in sequencing batch reactor |
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| Authors: | Qing XIA Rui LIANG Yuning HONG Lili DING Hongqiang REN Yuxiang MAO Mingyu ZHAO |
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| Affiliation: | 1.State Key Laboratoryof Pollution Control and Resource Reuse, School of Environment, NanjingUniversity, Nanjing 210093, China；China National EnvironmentalMonitoring Center, Beijing 100012, China; 2.State Key Laboratoryof Pollution Control and Resource Reuse, School of Environment, NanjingUniversity, Nanjing 210093, China; 3.Jiangsu Jiangshan PharmaceuticalCo., Ltd., Jingjiang 214500, China; 4.Grandway Technology InternationalCo., Ltd., Beijing 100102, China; |
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| Abstract: | Batch experiments were conducted to study the short-term biological effects of rare earth ions (La3+, Ce3+) and their mixture on the nitrogen removal in a sequencing batch reactor (SBR). The data showed that higher NH+4―N removal rate, total inorganic nitrogen removal efficiency, and denitrification efficiency were achieved at lower concentrations of rare earth elements (REEs) (<1mg/L). In the first hour of the aeration stage of SBR, the presence of REEs increased the total inorganic nitrogen removal efficiency and NH+4―N removal efficiency by 15.7% and 10%―15%, respectively. When the concentrations of REEs were higher than 1mg/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 50.0mg/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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| Keywords: | rare earth La3+ Ce3+ inorganic nitrogen nitrogen removal sequencing batch reactor |
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