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Effects of La3+, Ce3+ on nitrogen removal in sequencing batch reactor |
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| Authors: | Qing Xia Rui Liang Yuxiang Mao Yuning Hong Lili Ding Hongqiang Ren Mingyu Zhao |
| Institution: | 1. State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing, 210093, China 2. China National Environmental Monitoring Center, Beijing, 100012, China 3. Jiangsu Jiangshan Pharmaceutical Co., Ltd., Jingjiang, 214500, China 4. Grandway Technology International Co., Ltd., Beijing, 100102, China |
| 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 NH4 +-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 NH4 +-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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