Impact of intermittent power supply on electrokinetic remediation of chromium-contaminated soil

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-11-21 DOI:10.1002/jctb.7784

Zhaoqin Huang, LinChao Hu, Dongliang Ji, Xiaowei Feng, Liang Ge

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Abstract

BACKGROUND

This study investigates the effectiveness of electrokinetic remediation (EKR) with an intermittent power supply on soil contaminated with varying concentrations of chromium (Cr). Two soil types, designated as Soil A and Soil B, were analyzed to assess the impact of different remediation strategies.

RESULTS

Soil A, characterized by lower total Cr levels (1137 mg/kg), exhibited Cr (VI) removal rates exceeding 85%, peaking at 90.79% during the EK1 treatment (20 h on/4 h off). In contrast, Soil B, with significantly higher total Cr concentrations (6639 mg/kg), demonstrated a maximum Cr (VI) removal rate of approximately 80%. The study evaluated the influence of current, soil pH, and the three-dimensional distribution of total Cr, Cr (VI), and Cr (III). Energy consumption increased with longer power-off durations, while Soil B benefited from reduced energy usage and achieved nearly 10% higher Cr (VI) removal efficiency under specific conditions.

CONCLUSION

The findings demonstrate that EKR with intermittent power supply is an effective and energy-efficient approach for remediating Cr-contaminated soils, particularly when tailored to the specific characteristics of the contaminated soil types. © 2024 Society of Chemical Industry (SCI).

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间歇供电对铬污染土壤电动力修复的影响

背景：本研究探讨了间歇性供电的电动修复（EKR）对不同浓度铬（Cr）污染土壤的有效性。对土壤A和土壤B两种土壤类型进行了分析，以评估不同修复策略的影响。结果土壤A总Cr含量较低（1137 mg/kg），对Cr （VI）的去除率超过85%，在EK1处理（开4 h /开20 h）时达到90.79%。相比之下，土壤B具有较高的总铬浓度（6639 mg/kg），其Cr （VI）去除率最高可达80%左右。研究评估了电流、土壤pH值以及总Cr、Cr （VI）和Cr （III）的三维分布的影响。能量消耗随着断电时间的延长而增加，而土壤B受益于能量消耗的减少，在特定条件下Cr （VI）的去除效率提高了近10%。结论间歇供电的EKR是一种有效且节能的修复cr污染土壤的方法，特别是在针对污染土壤类型的特定特征时。©2024化学工业学会（SCI）。

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 chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.