重稀土元素钇对短程反硝化工艺的影响

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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 IC_{50(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.

Key words： rare earth yttrium partial denitrification nitrite accumulation bacterial activity

Received: 22 December 2020

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X703.1

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	Articles by authors
	LAI Cheng
	ZHOU Hao
	ZHANG Da-chao
	DONG Bing-yan
	PHILIP Antwi
	SU Hao
	SHI Miao

Cite this article:

LAI Cheng,ZHOU Hao,ZHANG Da-chao等. Effect of heavy rare earth element yttrium on partial denitrification process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3221-3228.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I7/3221

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