Migration Characteristics of Boron by Batch and Column Methods

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  • IGARASHI Toshifumi
    Central Research Institute of Electric Power Industry, Abiko Research Laboratory
  • SHIMOGAKI Hisashi
    Central Research Institute of Electric Power Industry, Abiko Research Laboratory

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  • バッチ法およびカラム法によるホウ素の地中移行特性
  • バッチホウ オヨビ カラムホウ ニ ヨル ホウソ ノ チチュウ イコウ トクセ

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Abstract

The trace elements leached from coal ash generated from coal-fired power plants migrate or diffuse into the surrounding soil and groundwater when the coal ash is disposed of in landfills. Boron, one trace element in coal ash, has a higher mobility in the underground than the other trace elements, because the main chemical form of boron has no electrical charge. Therefore, it is important to clarify the adsorption and migration behavior of boron in the underground environment. In this study, the adsorption of boron by soils was examined using three different methods: a batch method, a small-column method, and a large-column method called a lysimeter. The results showed that the adsorption isotherm conformed to the Henry type, and that the boron adsorption did not depend on the experimental method as well as the coexisting ions. However, the amount of boron adsorbed was pH-dependent and showed a maximum value in the weakly alkaline region. The above findings indicate that the migration characteristics of boron can be evaluated by the distribution coefficient obtained by the simplest batch method, when the boron concentration is less than approximately 20 mg/L and the pH is constant.

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