Reactive transport column experiment in volcanic ash soil and numerical modelling with anion and cation exchange reactions

K. Nakagawa, S. I. Wada, K. Momii

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

1 被引用数 (Scopus)

抄録

Groundwater contamination by nitrate from agricultural fields is a problem shared by many parts of the world. Kagoshima prefecture, Japan, is an important agricultural district experiencing this problem. In this study, laboratory column experiments were performed and a numerical model was developed to improve understanding of nitrate transport process through volcanic ash soils overlying the aquifer in this region. The volcanic ash soil (Kuroboku) was packed into the column that was assembled by stacking rings of an equal height. A solution of different salts, representing a soil solution after fertilizer application was added from the top of the column by constant head boundary conditions. The inflow was stopped when the dispersion front reached about the middle depth. Cation and anion concentrations in the solid and the liquid phases were analysed by ion chromatography. Competitive sorption due to cation and anion exchange was observed. Concentrations of anion components in liquid phase exceeded the initial concentration of the mixed solution due to desorption from the solid phase. Transport processes in the column experiments were analysed with the aid of reactive transport simulations incorporating cation and anion exchange reactions. Vertical profiles of the Kuroboku-experiment were reproduced by the developed model. Our model qualitatively reproduced the anion concentration exceedence due to desorption, anion retardation and cation exchange.

本文言語英語
ホスト出版物のタイトルGQ10: Groundwater Quality Management in a Rapidly Changing World
ページ459-462
ページ数4
342
出版ステータス出版済み - 2011
イベント7th International Groundwater Quality Conference: Groundwater Quality Management in a Rapidly Changing World, GQ10 - Zurich, スイス
継続期間: 6 13 20106 18 2010

その他

その他7th International Groundwater Quality Conference: Groundwater Quality Management in a Rapidly Changing World, GQ10
Countryスイス
CityZurich
Period6/13/106/18/10

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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