乳化纳米铁(EZVI)强化地下水氯代烃还原脱氯

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Abstract The biological reduction is an alternative for the remediation of chlorinated hydrocarbons polluted groundwater. However, some issues limit its effectiveness, such as long start up time for microbial acclimatization, continuous pH reduction and the accumulation of toxic by-products. Aiming at the limits, emulsified zero-valent iron (EZVI) was prepared by nano-zero-valent iron (NZVI) coated with emulsified oil (EVO) to retard NZVI passivation and continuously provide carbon source for anaerobic microbial dechlorination. The static batch experiments were conducted to study the kinetics of TCE reduction by EZVI and the intermediate metabolites of tetrachloroethylene (PCE) reduction by EZVI. The results showed that EZVI could effectively retard the passivation of NZVI and enhance the reaction activity.The removal process of TCE by EZVI was a first-order reaction and the reaction rate constant k_obs=0.182d^-1. Reduction of PCE by EZVI can inhibit the accumulation of DCE. On the 10th day, 97.2% PCE was removed by EZVI, which was 68.9% higher than that by adding EVO. In the reaction process, pH and ORP maintained at 6.5-7.5 and -50-10mV, respectively, which provided a beneficial reduction environment for the effective enhancement of the anaerobic biological dechlorination reaction.

Key words： emulsifiedzero-valent iron (EZVI) trichloroethylene (TCE) perchloroethylene (PCE) chemical reduction dechlorination anaerobic biological dechlorination

Received: 17 November 2021

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X703.5

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	Articles by authors
	SUN Ming-lu
	DONG Jun
	ZHANG Meng-yue
	SUN Chen

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SUN Ming-lu,DONG Jun,ZHANG Meng-yue等. Enhanced reductive dechlorination of chlorinated hydrocarbons in groundwater by emulsified zero-valentiron[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(6): 2690-2696.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I6/2690

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