研究报告

  • 于映雪,张秋兰,崔亚莉,邵景力,韩占涛.混合钠-钙电解质溶液的物质的量比和胶体粒径对胶体在饱和多孔介质中运移的影响[J].环境科学学报,2018,38(4):1474-1481

  • 混合钠-钙电解质溶液的物质的量比和胶体粒径对胶体在饱和多孔介质中运移的影响
  • Effects of molar ratio in mixed Na-Ca electrolyte solutions and colloid size on the transport of colloids in saturated porous media
  • 基金项目:国家自然科学基金青年科学基金(No.41502228)
  • 作者
  • 单位
  • 于映雪
  • 中国地质大学(北京)水资源与环境学院, 北京 100083
  • 张秋兰
  • 中国地质大学(北京)水资源与环境学院, 北京 100083
  • 崔亚莉
  • 中国地质大学(北京)水资源与环境学院, 北京 100083
  • 邵景力
  • 中国地质大学(北京)水资源与环境学院, 北京 100083
  • 韩占涛
  • 中国地质科学院水文地质环境地质研究所, 石家庄 050061
  • 摘要:通过室内砂柱实验,研究了饱和多孔介质中,相同离子强度条件下,混合钠-钙电解质溶液的Ca2+/Na+物质的量比和胶体粒径对胶体运移的影响.实验结果表明,胶体粒径相同时,随着背景电解质溶液物质的量比的增大,胶体的滞留量增多;物质的量比相同时,相同质量浓度条件下,粒径越小的胶体滞留量越大.经模型拟合,考虑Langmuirian动力学阻塞和与深度有关的沉积行为的对流-弥散-吸附-解吸方程能够很好地描述本次实验条件下胶体在饱和多孔介质中的运移行为.
  • Abstract:In this paper, we conducted a series of sand column experiments to investigate the influence of molar ratio scenarios of Ca2+/Na+ in mixed Na-Ca electrolyte systems under the same ionic strength and the influence of colloid size on the transport of colloids in saturated porous media. Results showed that retention of colloids increased with the increasing in molar ratio of electrolyte solution when the sizes of colloid were same; under the same colloid mass concentration, colloid retention increased with the decreasing in colloid size when the molar ratios were same. A numerical advection-dispersion-attachment-detachment equation considering the combined processes of Langmuirian dynamics blocking and depth-dependent deposition behavior successfully described colloid transport in saturated porous media under the conditions mentioned in the paper.

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