泥浆相电芬顿修复芘污染土壤及其特性分析

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Abstract The electro-Fenton (EF) process is a promising technology for removing contaminates from soil or water. However, there are many differences between soil and water during the EF remediation process. Therefore, the effect of EF process on the remediation of pyrene in contaminated-soil by a slurry-phase was investigated, especially the effect of the optimum parameters on hydroxyl radical (·OH) generation and pyrene degradation, including soil organic matter, soil-water distribution coefficient (K_p), surface tension and different soil particle-size. The results demonstrate that under optimum operating conditions (an aeration rate of 500mL/min, initial slurry pH of 3.0 and voltage gradient of 2V/cm), pyrene degradation of 81.83% and ·OH concentrations of 36.65 μmol/L were achieved. Both the content and the composition of the soil organic matter changed, with the changing of distribution of pyrene. Moreover, it showed a lower degradation of pyrene and a lower generation of ·OH during the latter period of the experiment, because of the change of pH and H₂O₂. In addition, the mass transfer of soil was enhanced by the slurry-phase system. And the high degradation of pyrene (89.26%) on the fine particle-size (< 0.005mm) of soil had occurred. Ultimately, these results have shown that incorporating the EF process into a slurry-phase reactor will create an efficient technology for the remediation of organic-polluted soil.

Key words： electro-Fenton slurry-phase pyrene hydroxyl radical mass transfer

Received: 20 March 2023

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X53

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	XU Wen-di
	WANG Yi-han
	GUO Shu-hai

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XU Wen-di,WANG Yi-han,GUO Shu-hai. Remediation of pyrene-contaminated soil using electro-Fenton in a slurry-phase: the characteristics analysis[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5320-5327.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5320

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