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 and Mingyu Zhao |
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| Institution: | (1) Department of Chemistry, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, People’s Republic of China;(2) College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, Hubei, 434025, People’s Republic of China;(3) State Key Laboratory of Virology, Wuhan University, Wuhan, 430072, People’s Republic of 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 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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