Enhanced migration and degradation of nitrobenzene in heterogeneous porous media using pulsed direct current electrical resistance heating with hydraulic circulation

IF 6.6 Q1 ENGINEERING, ENVIRONMENTAL

Journal of hazardous materials letters Pub Date : 2024-05-22 DOI:10.1016/j.hazl.2024.100113

Di Zheng , Zhuning Geng , Runlei Ge , Jingqi Dong , Guanghe Li , Fang Zhang

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引用次数: 0

Abstract

Electrical resistance heating (ERH) is a promising in-situ technology for heterogeneous organic contaminated site remediation, yet may have low efficiency when treating semi-volatile organic contaminant (SVOC) of relatively high boiling point. Herein, we chose nitrobenzene as a representative SVOC, and proposed an ERH system powered by pulsed direct current (PDC) with simple hydraulic circulation for improved remediation efficiency in heterogeneous media. The proposed PDC-ERH with hydraulic circulation showed overall improvement in heating performance and energy efficiency, as well as migration and removal of nitrobenzene. This new system improved the uniformity of PDC heating and achieved a temperature increase of ∼15°C compared to that using conventional alternating current (AC) of same voltage. Nitrobenzene migration out of the low permeability zone (LPZ) was intensified by the dual effects of heat-induced diffusion enhancement and electric field-induced electroosmotic flow, while subsequent removal was enhanced by electrochemical degradation and volatilization. After 96 h, the proposed system has a higher nitrobenzene removal from LPZ (> 97.1%) compared to that using AC (84.0%–95.9%). These results suggest PDC heating coupled with hydraulic circulation was a promising approach for heterogeneous site remediation.

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利用脉冲直流电阻加热和水力循环加强硝基苯在异质多孔介质中的迁移和降解

电阻加热（ERH）是一种很有前景的异质有机污染场地原位修复技术，但在处理沸点相对较高的半挥发性有机污染物（SVOC）时效率可能较低。在此，我们选择了硝基苯作为一种具有代表性的 SVOC，并提出了一种以脉冲直流电（PDC）为动力、采用简单水力循环的 ERH 系统，以提高在异质介质中的修复效率。所提出的带水力循环的脉冲直流-ERH 系统在加热性能和能效以及硝基苯的迁移和去除方面均有全面改善。这种新系统提高了 PDC 加热的均匀性，与使用相同电压的传统交流电相比，温度提高了 15°C。在热诱导扩散增强和电场诱导电渗流的双重作用下，硝基苯从低渗透区（LPZ）向外迁移的速度加快，而随后的电化学降解和挥发则促进了硝基苯的去除。96 小时后，与使用交流电（84.0%-95.9%）相比，拟议系统对 LPZ 中硝基苯的去除率更高（97.1%）。这些结果表明，PDC 加热与水力循环相结合是一种很有前途的异质场地修复方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of hazardous materials letters Pollution, Health, Toxicology and Mutagenesis, Environmental Chemistry, Waste Management and Disposal, Environmental Engineering

CiteScore

10.30

自引率

0.00%

发文量

审稿时长

20 days