4.6 Article

Mechanism and optimization of enhanced electro-kinetic remediation on 137Cs contaminated kaolin soils: A semi-pilot study based on experimental and modeling methodology

期刊

ELECTROCHIMICA ACTA
卷 284, 期 -, 页码 38-51

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.07.136

关键词

Electro-kinetic remediation; Non-uniform electric intensity; Polarity reversal; Cs-137 decontamination; Kaolin

资金

  1. China Postdoctoral Science Foundation [2017M611677]
  2. Fundamental Research Funds for the Central Universities [2017B11014, 2017B20414]
  3. Jiangsu Scientific Research Program [BE2015705, BE2017765]
  4. U.S. Army Engineer Research and Development Center [W912HZ-16-2-0021]
  5. U.S. Nuclear Regulatory Commission [NRC-HQ-84-15-G-0042, NRC-HQ-12-G-38-0038]

向作者/读者索取更多资源

Csium-137 (Cs-137) contamination resulted from wastes disposal and incidents holds serious threat to ecosystems and human health. Electro-kinetic remediation (EKR) is a promising technique for the Cs-137 remediation while soil pH polarization remains to be the obstacle for improving its performance. In this study, strategies of non-uniform electric intensity (EI) and polarity reversal (PR) have been employed to enhance the EKR. A 2-dimensinal (2D) numerical model was applied to stimulate the transport-reactive processes and predict the possible electro-chemical variations during the remediation. Within 168 h treatment, each strategy could increased the EKR efficiency on Cs-137 removal by 5% and larger increase (12%) was observed when combined these two strategies. Good agreements were achieved between the experimental and model results which further verified the feasibility of enhanced EKR on soil Cs-137 removal. In addition, a polynomial linear fitting analysis was implemented for the optimization of PR frequency. The 24 h was determined as the optimal PR frequency and 90% of Cs-137 (276 mg) in polluted kaolin was eliminated within 415 h by PR-EKR under a non-uniform EI. Moreover, the energy utilization efficiency and cost for such technology was obtained in an acceptable value of 0.96 mg/kWh and $ 829, respectively. The results of the semi-pilot experiments indicated that EKR enhanced with non-uniform EI and PR strategies might be practicable and effective for the decontamination of soil Cs-137 in full-scale applications. (C) 2018 Elsevier Ltd. All rights reserved.

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