Electrokinetic decontamination of soils contaminated with cationic metals under neutral pH conditions

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  • SUZUKI Tasuma
    Department of Environmental Science and Engineering, Yamaguchi University
  • NISHIBAYASHI Yukari
    Department of Sustainable Environmental Engineering, Faculty of Engineering, Yamaguchi University
  • KAWAI Katsunori
    Department of Environmental Science and Engineering, Yamaguchi University
  • OYAMA Yukinori
    Department of Environmental Science and Engineering, Yamaguchi University
  • NINAE Masakazu
    Department of Environmental Science and Engineering, Yamaguchi University

Bibliographic Information

Other Title
  • 土壌pHを中性領域に保った条件下におけるカチオン系金属汚染土壌の動電学的浄化処理
  • 土壌pHを中性領域に保った条件下におけるカチオン系金属汚染土壌の動電学的浄化処理 : 電圧波形が浄化効率に与える影響とそのメカニズム
  • ドジョウ pH オ チュウセイ リョウイキ ニ タモッタ ジョウケン カ ニ オケル カチオンケイ キンゾク オセン ドジョウ ノ ドウデンガクテキ ジョウカ ショリ : デンアツ ハケイ ガ ジョウカ コウリツ ニ アタエル エイキョウ ト ソノ メカニズム
  • 電圧波形が浄化効率に与える影響とそのメカニズム
  • Influence of voltage waveforms on the performance and its mechanism

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Abstract

Batch desorption experiments and bench-scale electrokinetic experiments were performed to elucidate the electrokinetic remediation mechanisms of cationic metals from artificially contaminated kaolinite. The electrokinetic experiments demonstrated that the remediation efficiency was increased in the order of Pb<Cd<Mg, which is consistent with the order of water solubility under the experimental pH condition investigated in this study (pH ≈ 6.9). A series of electrokinetic experiments also showed that applying a pulse voltage clearly affected the remediation efficiencies, but the manner in which it did and the extent of the effect depended on the cation type and pulse duration. The electrokinetic experiments in which a pulse voltage (3 hours ON, 3 hours OFF) was applied demonstrated that applying the pulse voltage reduced electricity consumption for recovering Cd in the cathode well; this trend was not observed for Mg. These electrokinetic experimental results, with the support of metal desorption data obtained from batch experiments, indicate that the remediation rate-limiting step for Cd was the desorption of Cd into the interstitial water rather than the migration of the dissolved Cd toward the cathode. It was also demonstrated that applying a pulse voltage (2 seconds ON, 2 seconds OFF) was found to negatively affect the remediation performance with respect to the electricity consumption when compared to the case in which a pulse voltage (3 hours ON, 3 hours OFF) was applied.

Journal

  • Journal of MMIJ

    Journal of MMIJ 130 (12), 522-526, 2014

    The Mining and Materials Processing Institute of Japan

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