Effect of heavy rare earth element yttrium on partial denitrification process
LAI Cheng1, ZHOU Hao1, ZHANG Da-chao1, DONG Bing-yan1, PHILIP Antwi1, SU Hao1, SHI Miao2
1. School of Resources & Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China; 2. Ganzhou Ecological Environment Engineering Investment Co., Ganzhou 341000, China
Abstract：The short-term and long-term effects of heavy rare earth element Y(III) on the partial denitrification process were studied respectively. The result showed that when the concentration of Y(III) was 1~50mg/L, the concentration of effluent nitrite did not change significantly. When the concentration of Y(III) was 60~100mg/L, the concentration of effluent nitrite decreased and the concentration of effluent nitrate increased. When the concentration of Y(III) was 1~10mg/L the bacterial activity was promoted; when the concentration of Y(III) was 20~100mg/L, the bacterial activity was inhibited. The Y(III) of extracellular adsorption was the main factor that inhibits bacterial activity. The correlation coefficient R2 of linear fitting was 0.957, the half maximal inhibitory concentration IC50(adsorption) was 1.079mg/L (based on wet weight), and the corresponding concentration of Y(III) was 54.35mg/L. SEM showed that the addition of Y(III) made the bacteria produce more extracellular polymeric substance (EPS), and encapsulated the bacteria to resist the toxicity of Y(III). EDS showed that the contents of C and N elements on the surface of the coated bacteria decreased significantly, and EPS affected the mass transfer of substrate. Long-term experiments of 130 days showed that 5mg/L Y(III) would cause the reactor to collapse. Even if the addition of rare earths was stopped, the nitrite accumulation function of the reactor couldnot be restored.
赖城, 周豪, 张大超, 董冰岩, Philip Antwi, 苏昊, 石淼. 重稀土元素钇对短程反硝化工艺的影响[J]. 中国环境科学, 2021, 41(7): 3221-3228.
LAI Cheng, ZHOU Hao, ZHANG Da-chao, DONG Bing-yan, PHILIP Antwi, SU Hao, SHI Miao. Effect of heavy rare earth element yttrium on partial denitrification process. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3221-3228.
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